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Automobile Engineering MCQ Questions & Answers

Automobile Engineering MCQs : This section focuses on the "Automobile Engineering". These Multiple Choice Questions (MCQs) should be practiced to improve the Automobile Engineering skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

The main function of a master cylinder is to

A. Adjust the extent of brake pedal free play
B. Boost the force applied to brake pedal
C. Convert brake pedal force into hydraulic pressure
D. Ensure that all the wheel brakes are supplied with the same amount of fluid pressure

View Answer

Question 2

An oil filter bypass valve opens when the

A. Engine is cold
B. Engine overheats
C. Oil filter becomes clogged
D. Engine runs at high speed

View Answer

Question 3

In a ventilated disc brake,

A. a duct directs air towards the caliper for cooling while the vehicle is moving
B. caliper is covered with cooling fins
C. disc contains many small holes for optimum cooling performance
D. disc contains radial vanes between its rubbing surfaces for optimum cooling performance

View Answer

Question 4

In bias ply tyres

A. All plies run parallel to one another
B. Belts of steel mesh are used in the tyres
C. One ply layer runs diagonally one way and another layer runs diagonally the other way
D. All of the above

View Answer

Question 5

The auto ignition in a spark ignition engine means

A. Automatic ignition of the charge at the end of compression
B. Ignition induced by the passage of a spark
C. Ignition of the charge before the passage of flame front
D. Ignition induced to supplement the process of normal combustion

View Answer

Question 6

When turning a corner

A. The front wheels are toeing out
B. The front wheels are turning on different angles
C. The inside front wheels has a greater angle than the outside wheel
D. All of the above

View Answer

Question 7

The firing order for an in-line four cylinder I.C. engine is

A. 1-2-3-4
B. 1-3-4-2
C. 1-2-4-3
D. 1-3-2-4

View Answer

Question 8

The main cause for the change in engine oil viscosity is

A. Humidity
B. Temperature
C. Vibration
D. Contamination

View Answer

Question 9

The function of an alternator in an automobile is to

A. supply electric power
B. convert mechanical energy into electrical energy
C. continually recharge the battery
D. partly convert engine power into electric power

View Answer

Question 10

In aluminium cylinder blocks, the cylinder liners are made of

A. Aluminium
B. Ceramic
C. Brass
D. Cast iron

View Answer

Question 11

The function of a governor in automobiles is to

A. Limit the power
B. Limit the vehicle speed
C. Maintain constant engine speed
D. Maximise the fuel economy

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Question 12

The purpose of a balancer shaft is to

A. Balance the timing in the movement of the two groups of pistons
B. Increase inertia force of the rotating crankshaft
C. Reduce vibrations caused by the crankshaft rotation
D. Adjusts the timing of the intake and exhaust valve openings

View Answer

Question 13

Which of the following symptom is caused as a result of brake disc run out?

A. Ineffectiveness of the brakes
B. Judder during braking
C. Localized wearing of the brake pads
D. Rapid wearing of the brake pads

View Answer

Question 14

During suction stroke, the inside pressure of cylinder is

A. More than the atmospheric pressure
B. Less than the atmospheric pressure
C. Equal to the atmospheric pressure
D. None of these

View Answer

Question 15

The reconditioning process used to give cylinder bore surfaces a crosshatch pattern, is known as

A. Honing
B. Porous plating
C. Boring
D. Shot peening

View Answer

Question 16

Which of the following bulb in a car will have the least wattage?

A. Head light bulb
B. Stop light bulb
C. Parking light bulb
D. Ignition warning bulb

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Question 17

A clutch is usually designed to transmit maximum torque which is

A. equal to the maximum engine torque
B. 80 per cent of the maximum engine torque
C. 150 per cent of the maximum engine torque
D. none of these

View Answer

Question 18

The positive plates of a lead acid battery has

A. Lead peroxide (PbO₂)
B. Spongy lead (Pb)
C. Lead sulphate (PbSO₄)
D. Sulphuric acid (H₂SO₄)

View Answer

Question 19

The included angle is the sum of the

A. Camber and castor
B. Castor and S.A.I.
C. Camber and S.A.I.
D. Camber and toe in

View Answer

Question 20

In petrol engines, during suction stroke, _________ is drawn in the cylinder

A. Air and fuel
B. Only fuel
C. Only air
D. None of these

View Answer

Question 21

Which of the following oil is more viscous?

A. SAE 30
B. SAE 40
C. SAE 70
D. SAE 80

View Answer

Question 22

The exhaust gas from petrol engine contains

A. Petrol vapours
B. Water vapours
C. Carbon monoxide
D. All of these

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Question 23

The cetane number of a Diesel fuel is a measure of

A. volatility
B. viscosity
C. ignition quality
D. delay peirod

View Answer

Question 24

The calorific value of petrol is about

A. 36.5-38.5 MJ/kg
B. 39.4-42.5 MJ/kg
C. 42.7-43.5 MJ/kg
D. 45.5-47 MJ/kg

View Answer

Question 25

The function of oil control rings is that it

A. Lubricates the cylinder wall by releasing oil from its hole
B. Keeps the cylinder wall lubricated by holding oil in its channel
C. Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
D. Maintains a seal and prevents escape of burned gases and oil leakage

View Answer

Question 26

Which of the following symptom is caused as a result of brake disc run out ?

A. Ineffectiveness of the brakes
B. Judder during braking
C. Localized wearing of the brake pads
D. Rapid wearing of the brake pads

View Answer

Question 27

The main function of a resonator is that it

A. Regulates the intake air flow rate
B. Reduces the intake air noise
C. Enhances intake efficiency
D. Regulates the intake air temperature

View Answer

Question 28

The function of an oil control orifice is that it

A. Returns cylinder head lubricating oil to the oil pan at high speed
B. Turns oil into fine mist for spray lubrication
C. Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes
D. Removes impurities from cylinder head lubricating oil

View Answer

Question 29

An under-inflated tyre will wear the tread most

A. Near the centre
B. Near the edges
C. In the lateral direction
D. In the cross direction

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Question 30

If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

A. 17:1
B. 15:1
C. 13:1
D. 10:1

View Answer

Question 31

In automobiles G.V.W. refers to

A. gross vehicle width
B. gross vehicle weight
C. gross vehicle wheel base
D. gross vehicle wheel track

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Question 32

A four cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is

A. 400 cm³
B. 600 cm³
C. 1200 cm³
D. 2400 cm³

View Answer

Question 33

The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as

A. Supercharging
B. Auto ignition
C. Scavenging
D. Detonation

View Answer

Question 34

The cetane number of a Diesel fuel is a measure of

A. Volatility
B. Viscosity
C. Ignition quality
D. Delay period

View Answer

Question 35

If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

A. 17:01
B. 15:01
C. 13:01
D. 10:01

View Answer

Question 36

The connecting rods are generally made of __________ shaped cross-section.

A. I
B. C
C. L
D. H

View Answer

Question 37

An overinflated tyre will wear the tread most near the

A. Edges
B. Corners
C. Centre
D. None of these

View Answer

Question 38

The component that connects the steering rack to the knuckles is

A. tie-rod
B. sector gear
C. pivot
D. spline

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Question 39

Incorrect steering axis inclination (S.A.I.) causes

A. tendency to assume toe-out orientation
B. generation of a braking effect at tight corners
C. poor recovery of the steering wheel after making a turn
D. the vehicle to pull to the side of lesser inclination

View Answer

Question 40

The specific gravity of petrol is about

A. 0.75
B. 0.85
C. 0.95
D. 1.25

View Answer

Question 41

When a gear box has four forward speeds and one reverse speed, it is said to be a

A. 3-speed gear box
B. 4-speed gear box
C. 5-speed gear box
D. 6-speed gear box

View Answer

Question 42

The valve tappet clearance is measured by

A. Screw pitch gauge
B. Engineering scale
C. Feeler gauge
D. Vernier caliper

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Question 43

The damper fluid leakage typically occur from

A. Upper damper mounting
B. Bottom of damper
C. Clearance between inner and outer tubes of damper
D. Coil spring mounting

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Question 44

In a single dry plate clutch, torsional vibrations are absorbed by

A. Coil springs known as torsional springs
B. Cushion springs
C. Central hub
D. Clutch pedal

View Answer

Question 45

In order to implement gear changes in the gear unit of an automatic transmission, a ___________ is used.

A. Synchronizer
B. Planetary gear
C. Magnetic clutch
D. Hydraulic multi plate clutch

View Answer

Question 46

If the valve clearances are excessively large, the problem that can arise is

A. Overheating of the engine
B. Incomplete valve closure
C. Fouling of spark plug by gasoline
D. None of these

View Answer

Question 47

A maintenance free battery

A. Has lead-antimony plate grid
B. Has lead-calcium plate grid
C. Does not contain acid
D. Does not contain water

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Question 48

The gear shift lever requires two separate motions to shift gears, and the first movement

A. Moves the synchronizer
B. Selects the synchronizer
C. Meshes the gears
D. Operates the clutch

View Answer

Question 49

It is necessary to maintain the valve clearances as they

A. reduce the resistance to sliding that occurs between the cam and the tappet
B. allow for lengthening of the valves owing to the heat of combustion
C. increase the speed at which the valves move up and down
D. make the crankshaft turn smoothly

View Answer

Question 50

Tachometer in a vehicle measures

A. Speed
B. Distance
C. Engine r.p.m.
D. Fuel consumption

View Answer

Question 51

The correct flow of power through the drive train is

A. Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels
B. Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels
C. Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels
D. Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels

View Answer

Question 52

The engine oil viscosity is defined by ___________ ratings.

A. Automatic transmission fluid (ATF)
B. Society of automotive engineers (SAE)
C. Gross vehicle weight (GVW)
D. American petroleum institute (API)

View Answer

Question 53

The lower cylindrical portion of the piston which improves piston cooling performance is called

A. Piston crown
B. Connecting rod
C. Piston pin boss
D. Piston skirt

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Question 54

A laminated glass upon cracking

A. Bursts into sharp edged fragments
B. Bursts into granular pieces
C. Sandwiched layer traps the fragments
D. Breaks into the form of crystals

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Question 55

In a spark plug, when the temperature of the central electrode exceeds a certain temperature, any carbon that has adhered will be burnt off, and the temperature at which this burning off carbon starts is referred to as the self cleaning temperature.

A. Correct
B. Incorrect

View Answer

Question 56

The firing order for an opposed four cylinder l.C. engine is

A. 1-2-3-4
B. 1-3-4-2
C. 1-4-3-2
D. 1-3-2-4

View Answer

Question 57

The aluminium alloy is used in cylinder blocks because

A. It is lighter and has good heat dissipation characteristics
B. Material cost is low
C. It does not require any cylinder liners
D. The piston is also made of aluminium alloy

View Answer

Question 58

The characteristic that is enhanced by the honing of cylinder sleeves inner surface is

A. Cooling efficiency
B. Resistance to wear
C. Lubrication performance
D. None of these

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Question 59

The component in the radiator of an automobile that increases the boiling point of water is

A. Drain plug
B. Water jacket
C. Vacuum valve
D. Pressure cap

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Question 60

The purpose of a thermostat in an engine cooling system is to

A. Prevent the coolant from boiling
B. Allow the engine to warm up quickly
C. Indicate the coolant temperature
D. Pressurise the system to raise the boiling point

View Answer

Question 61

The function of positive crankcase ventilation (PCV) system is that it

A. Mixes fuel with air
B. Promotes combustion by creating a swirling movement in the air-fuel mixture
C. Returns blow by gases from the crankcase to the intake system
D. Feeds blow by gases to the exhaust manifold

View Answer

Question 62

The problems caused by the wheel imbalance are

A. Hard steering and hard ride
B. Poor acceleration and hard steering
C. Steering wheel vibrations and uneven tyre wear
D. Poor acceleration and reduced fuel efficiency

View Answer

Question 63

The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is

A. 1.6694 N
B. 16.694 N
C. 166.94 N
D. 1669.4 N

View Answer

Question 64

The composition of the electrolyte in a fully charged battery is that

A. The electrolyte is pure distilled water
B. The electrolyte is pure sulphuric acid
C. The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
D. The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight

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Question 65

The flywheel and the pressure plate bind the clutch disc between them so that the engine and the transmission can be engaged.

A. Yes
B. No

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Question 66

In a four stroke engine for each crankshaft revolution, the camshaft revolves

A. One half turn
B. One turn
C. Two turns
D. Four turns

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Question 67

In a four speed four stroke Diesel engine, the intake valve

A. Opens at T.D.C. and closes at B.D.C.
B. Opens at 20° before T.D.C. and closes at 35° after B.D.C.
C. Opens at 10° after T.D.C. and closes at 20° before B.D.C.
D. None of the above

View Answer

Question 68

Two advantages of using helical gears rather than spur gears in a transmission system are

A. Strength and cost
B. Strength and less end thrust
C. Noise level and strength
D. Noise level and economy

View Answer

Question 69

The connecting rod is attached to the piston by the

A. Cap bolt
B. Piston pin
C. Cap roller bearing
D. Rod cap

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Question 70

The function of a proportioning control valve (PCV) in a brake system is to

A. Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation
B. Reduce the brake fluid pressure when the brakes approach their lockup point
C. Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level
D. Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level

View Answer

Question 71

The valve overlap in four stroke petrol engines is approximately

A. 30°
B. 60°
C. 90°
D. 120°

View Answer

Question 72

Petrol that detonates easily is called

A. High octane petrol
B. Low octane petrol
C. Unleaded petrol
D. Blended fuel

View Answer

Question 73

How many cells are used in a 12 volt car battery?

A. 2
B. 4
C. 6
D. 8

View Answer

Question 74

The mechanical efficiency (ηm) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

A. I.P/B.P.
B. B.P/I.P.
C. B.P/F.P.
D. F.P/B.P.

View Answer

Question 75

The boiling point of Diesel fuel is in the range of

A. 70°C to 100°C
B. 100°C to 120°C
C. 120°C to 180°C
D. 180°C to 360 °C

View Answer

Question 76

A baffle plate is fitted inside the oil pan to prevent the oil from splashing when it is subjected to vibration and other movement during vehicle operation.

A. TRUE
B. FALSE

View Answer

Question 77

The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of

A. Section width to section height
B. Section height to section width
C. Wheel diameter to section height
D. Wheel diameter to section width

View Answer

Question 78

The service brakes employed in cars are generally operated

A. Mechanically
B. Hydraulically
C. Pneumatically
D. None of these

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Question 79

In vehicles with tilt steering, the steering column is pivoted in

A. Upper bracket
B. Lower bracket
C. Tilt bracket
D. Steering yoke joint

View Answer

Question 80

The aluminium alloy is used in cylinder blocks because

A. it is lighter and have good heat dissipation characteristics
B. material cost is low
C. it does not require any cylinder liners
D. the piston is also made of aluminium alloy

View Answer

Question 81

If a tyre is designated as 175/65 R-14 82-S, then the aspect ratio for the tyre is

A. 175
B. 65
C. 14
D. 82

View Answer

Question 82

Which of the following indicates a multigrade oil ?

A. SAE 30
B. API SF
C. SAE 20 W-50
D. API 50

View Answer

Question 83

The purpose of turning radius gauges is to measure the

A. Contact areas of the tyres
B. Free plays of the steering wheel
C. Turning radius of the left and right wheels
D. Difference in the toe angles of the left and right wheels

View Answer

Question 84

In which of the following conditions, the idle CO percentage should be measured with the vehicle?

A. Headlights and other electrical devices are switched off
B. Headlights and other electrical devices are switched on
C. Headlights and other lights are switched off
D. Headlights are switched on

View Answer

Question 85

Highest useful compression ratio (HUCR) is the highest compression ratio at which the

A. Engine can run
B. Engine gives maximum output
C. Engine is most efficient
D. Fuel can be used in a test engine without knocking

View Answer

Question 86

Free pedal play in car clutches is about

A. 15 mm
B. 25 mm
C. 40 mm
D. 60 mm

View Answer

Question 87

The best fuels for compression ignition engines are

A. Straight chain paraffin
B. Aromatics
C. Branched chain paraffin
D. Naphthalene

View Answer

Question 88

Wheel base of a vehicle is the

A. Distance between the centres of the front and rear wheels
B. Distance between the centres of the front tyres
C. Distance between the centres of the rear tyres
D. Extreme length of the vehicle

View Answer

Question 89

The engine oil is stored in _________ when the engine is not running.

A. Oil pan
B. Cylinder head
C. Oil pump
D. Separate oil tank

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Question 90

The order in which effort applied to the steering wheel is transferred to the front wheel is

A. Steering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels
B. Steering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels
C. Steering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels
D. Steering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels

View Answer

Question 91

The coefficient of friction for the clutch facing is approximately

A. 0.1
B. 0.4
C. 0.8
D. 1.2

View Answer

Question 92

The power source for a brake booster is

A. Exhaust manifold pressure
B. Electricity
C. The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold
D. Hydraulic pump

View Answer

Question 93

The purpose of a cylinder head gasket is to

A. Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
B. Prevent engine oil from going into combustion chamber
C. Removes impurities from cylinder head lubricating oil
D. None of the above

View Answer

Question 94

The cetane rating of Diesel fuel is in the order of

A. 25
B. 45
C. 70
D. 90

View Answer

Question 95

The main characteristics of a maintenance free (MF) battery is that

A. A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
B. A maintenance free battery has a relatively short shelf life when compared with standard batteries
C. Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water
D. Recharging of a maintenance free battery is neither required nor possible

View Answer

Question 96

The device for smoothening out the power impulses from the engine is called

A. Clutch
B. Differential
C. Flywheel
D. Torque converter

View Answer

Question 97

In a unit type body (frameless body) design, the sheet metal parts are welded together, forming a frame work to which outer skin is attached.

A. TRUE
B. FALSE

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Question 98

The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be

A. R
B. 2R
C. 4R
D. 4R²

View Answer

Question 99

If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called

A. detonation
B. ignition
C. pre-ignition
D. rumble

View Answer

Question 100

The instrument used to check specific gravity of acid in a battery is

A. Hydrometer
B. Hygrometer
C. Anemometer
D. Multimeter

View Answer

Question 101

The information provided by the oxygen (O₂) sensor to the feedback control system is about the

A. Air-fuel ratio
B. Air temperature
C. Air flow speed
D. Exhaust gas volume

View Answer

Question 102

The connecting rod connects the piston and the

A. Cylinder head
B. Cylinder block
C. Camshaft
D. Crankshaft

View Answer

Question 103

The minimum parking brake force is generally ___________ of gross vehicle mass (GVM).

A. 5%
B. 10%
C. 15%
D. 20%

View Answer

Question 104

The crankcase dilution means

A. Dilution of fuel in the crankcase
B. Dilution of oil by water in the crankcase
C. Dilution of lubrication oil by fuel in the crankcase
D. Dilution of mixture passing through crankcase in two stroke engines

View Answer

Question 105

The piston compression rings are made of

A. Cast iron
B. Steel
C. Aluminium
D. Bronze

View Answer

Question 106

In a hydraulic power steering system, the power steering pump is driven by a

A. Belt driven by camshaft
B. Chain driven by crankshaft
C. Belt driven by drive-shaft
D. Belt driven by crankshaft

View Answer

Question 107

The engine oil level should be checked

A. Immediately after the ignition switch is turned off
B. While the engine is running
C. A few minutes after the ignition switch is turned off
D. While the engine is running at high idle speed

View Answer

Question 108

In a petrol engine, the high voltage for spark plug is in the order of

A. 1000 volts
B. 2000 volts
C. 11 kilovolts
D. 22 kilovolts

View Answer

Question 109

The cam shaft in an engine is always mounted

A. Parallel to the crankshaft
B. Perpendicular to the crankshaft
C. Inclined to the crankshaft
D. None of these

View Answer

Question 110

The purpose of transmission in an automobile is

A. To vary the speed of automobile
B. To vary the torque at the wheels
C. To vary the power of automobile
D. None of these

View Answer

Question 111

Odometer is an instrument used for measurement of

A. Power
B. Fuel consumption
C. Engine r.p.m.
D. Distance

View Answer

Question 112

In Diesel engines, during suction stroke, _________ is drawn in the cylinder.

A. Air and fuel
B. Only fuel
C. Only air
D. None of these

View Answer

Question 113

The condition that results in large quantities of CO emission is

A. Insufficient air during combustion
B. Insufficient fuel during combustion
C. Low temperature combustion
D. High temperature combustion

View Answer

Question 114

The rolling resistance is because of the friction between the

A. Wheel rim and tyre
B. Tyre and the road surface
C. Wheel rim and road surface
D. None of these

View Answer

Question 115

A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

A. Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
B. Allows the steering wheel to be turned by a greater amount when steering
C. Makes the steering more responsive
D. Reduces the amount of kickback for large steering angles

View Answer

Question 116

The fuel pump in the programmed fuel injection (PFI) system is located

A. Between the fuel filler pipe and fuel tank
B. In the fuel tank
C. On the distributor mounting in the engine compartment
D. On the engine compartment bulkhead

View Answer

Question 117

The crescent shaped cavity on the piston head top surface is called as

A. Piston oil hole
B. Snap ring
C. Valve recess
D. Valve clearance

View Answer

Question 118

If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

A. Too lean mixture
B. Stoichiometric mixture
C. Most economical mixture
D. Too rich mixture

View Answer

Question 119

The battery is an electrochemical device, which means battery

A. makes chemicals by mechanical means
B. uses chemical action to provide electricity
C. has curved plates instead of flat plates
D. does not use an electrolyte

View Answer

Question 120

Caster is a

A. Forward tilt of the kingpin
B. Backward tilt of the kingpin
C. Either 'A' or 'B'
D. None of these

View Answer

Question 121

The main merit of a multi cylinder type cylinder sleeve is

A. Smaller engine dimensions
B. Better cooling efficiency
C. High rigidity
D. None of these

View Answer

Question 122

The two rows of cylinders in a 'V' type engine are generally arranged at

A. 45°
B. 60°
C. 90°
D. 130°

View Answer

Question 123

The material generally used for cylinder sleeves is

A. Aluminium
B. Ceramic
C. Cast iron
D. Fibre reinforced plastic

View Answer

Question 124

The camshaft of a four stroke Diesel engine running at 1000 rpm will run at

A. 500 rpm
B. 1000 rpm
C. 2000 rpm
D. 4000 rpm

View Answer

Question 125

The basic part of the engine, to which the other engine parts are attached or assembled is the

A. Cylinder head
B. Crankshaft
C. Cylinder block
D. Oil pan

View Answer

Question 126

The starting system includes

A. A battery, a starter, and an ignition switch
B. A battery, a distributor, and an ignition switch
C. A battery, a starter, and a distributor
D. A distributor, a starter, and an ignition switch

View Answer

Question 127

The basic function of the suspension is to

A. Absorbs vibration and impact forces from the road surface
B. Ensure that the steering wheel can deliver a suitable amount of steering force
C. Ensure that wheel alignment is not disturbed during driving
D. Automatically correct the effects of over steering

View Answer

Question 128

A clutch is usually designed to transmit maximum torque which is

A. Equal to the maximum engine torque
B. 80% of the maximum engine torque
C. 150% of the maximum engine torque
D. None of these

View Answer

Question 129

The main function of intake manifold is that it

A. promotes the mixture of air and fuel
B. reduces intake noise
C. cools the intake air to a suitable temperature
D. distributes intake air equally to the cylinders

View Answer

Question 130

What type of bearing is used for main bearings and connecting rod bearings ?

A. Ballbearings
B. Plain bearings
C. Needle roller bearing
D. Taper roller bearing

View Answer

Question 131

The brake warning light warns the driver of

A. Water in the master cylinder
B. Air in the hydraulic system
C. Failure of the primary or secondary circuit of hydraulic system
D. Power brake failure

View Answer

Question 132

The firing order for an inline four cylinder I.C. engine is

A. 1-2-3-4
B. 1-3-4-2
C. 1-2-4-3
D. 1-3-2-4

View Answer

Question 133

The difference between DOT 3 and DOT 4 brake fluids is

A. DOT 4 fluids have a higher boiling point than DOT 3 fluid
B. DOT 4 fluids have a lower boiling point than DOT 3 fluid
C. DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
D. DOT 4 fluid is more resistant to freezing than DOT 3 fluid

View Answer

Question 134

The materials used for cylinder block are

A. Cast iron and steel
B. Cast iron and aluminium alloy
C. Steel and aluminium alloy
D. Brass and steel

View Answer

Question 135

Thinner is added to the paint in order to

A. Make pigments and resin mix easily
B. Make paint film hard
C. Optimise its viscosity
D. None of these

View Answer

Question 136

The component that connects the steering rack to the knuckles is

A. Tie rod
B. Sector gear
C. Pivot
D. Spline

View Answer

Question 137

If clearance volume of I.C. engines is increased, the compression ratio will

A. Increase
B. Decrease
C. Remain constant
D. Be doubled

View Answer

Question 138

The painting of automobiles is done to

A. Prevent rust from growing on the body
B. Improve its external appearance
C. Retain the characteristics of steel for long
D. All of these

View Answer

Question 139

The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called

A. camber
B. caster
C. toe-in
D. toe-out

View Answer

Question 140

The formula for Iso-octane is

A. C8H18
B. C7H17
C. C6H18
D. C7H18

View Answer

Question 141

Positive camber is used to compensate for wheels tilting inward due to the weight of the vehicle.

A. Yes
B. No

View Answer

Question 142

The basic purpose of providing caster angle on wheels is to

A. Prevent uneven tyre wear
B. Maintain directional control
C. Bring the road contact of the tyre under the point of load
D. Compensate for wear in the steering linkage

View Answer

Question 143

The specific gravity of Diesel is about

A. 0.65
B. 0.75
C. 0.85
D. 0.95

View Answer

Question 144

When the brake pedal free play is less than the specified value, then the

A. Brake drags
B. Brake fades
C. Vapour locking occurs in the brake lines
D. Antilock braking system malfunctions

View Answer

Question 145

In radial tyres

A. one ply layer runs diagonally one way and another layer runs diagonally the other way
B. all plies run parallel to one another and vertical to tyre bead
C. inner tubes are always used
D. none of these

View Answer

Question 146

What type of bearing is used for main bearings and connecting rod bearings?

A. Ball bearings
B. Plain bearings
C. Needle roller bearing
D. Taper roller bearing

View Answer

Question 147

The rigid suspension is beneficial when

A. It is desired to reduce the unsprung mass
B. It is desired to have more flexibility in design
C. It is desired to improve tyre to ground contact characteristics
D. Large changes in load make it necessary to have a large suspension stroke

View Answer

Question 148

A traction control system (TCS) in automobiles controls the

A. vibrations on the steering wheel
B. engine power during acceleration
C. torque that is transmitted by the tyres to the road surface
D. stopping distance in case of emergency

View Answer

Question 149

Instead of valves, the ports are used in case of

A. Four stroke I.C. engines
B. Two stroke I.C. engines
C. V6 engines
D. None of these

View Answer

Question 150

The tyre rotation is generally done at

A. 1000 km
B. 4000 km
C. 6000 km
D. 10,000 km

View Answer

Question 151

The power actually developed inside the engine cylinder is called as

A. Indicated power
B. Brake power
C. Frictional power
D. None of these

View Answer

Question 152

The information provided by the oxygen (O2) sensor to the feedback control system is about the

A. air-fuel ratio
B. air temperature
C. air flow speed
D. exhaust gas volume

View Answer

Question 153

The capacity of a battery is usually expressed in terms of

A. Volts
B. Amperes
C. Weight
D. Ampere hours

View Answer

Question 154

The braking control type traction control system (TCS) generally operates in the speed range of

A. Less than 20 kmph
B. Less than 40 kmph
C. Less than 60 kmph
D. More than 60 kmph

View Answer

Question 155

The component of the oil filter that prevents the passage of metal particles and sludge is

A. Element
B. Relief valve
C. Check valve
D. Case

View Answer

Question 156

The crankshaft of a typical inline four cylinder engine has ________ balance weights.

A. 12
B. 4
C. 16
D. 8

View Answer

Question 157

The connecting rod lower end is connected to the relevant ________ of crankshaft.

A. Big end
B. Crank arm
C. Journal
D. Small end

View Answer

Question 158

The maximum torque multiplication ratio in a torque converter is about

A. 2.5
B. 10
C. 25
D. 40

View Answer

Question 159

The Diesel engines are also known as

A. Spark ignition (S.I.) engines
B. Compression ignition (C.I.) engines
C. Steam engines
D. None of these

View Answer

Question 160

The torque available at the contact between driving wheels and road is known as

A. brake effort
B. tractive effort
C. clutch effort
D. none of these

View Answer

Question 161

One effect of detonation is

A. Delay in ignition
B. Loss of power
C. Overheating of engine
D. Overcooling of engine

View Answer

Question 162

The timing belt is attached to the camshaft pulley and

A. Timing belt drive pulley
B. Distributor
C. Radiator fan pulley
D. Alternator pulley

View Answer

Question 163

The main task of a battery in automobiles is to

A. Supply electricity to the alternator
B. Act as a reservoir or stabilizer of electricity
C. Supply electricity to the vehicle's electrical system at all times while the engine is running
D. Supply a large amount of power to turn the starter motor when the engine is being started

View Answer

Question 164

The parking brakes employed in vehicles are operated

A. Mechanically
B. Hydraulically
C. Pneumatically
D. None of these

View Answer

Question 165

For the same maximum pressure and temperature

A. Diesel cycle is more efficient than Otto cycle
B. Otto cycle is more efficient than Diesel cycle
C. Both Otto cycle and Diesel cycle are equally efficient
D. None of the above

View Answer

Question 166

In a four cylinder inline engine, the number of firing strokes in one revolution of the crank is

A. 1
B. 2
C. 3
D. 4

View Answer

Question 167

The parking brake generally acts on

A. Front wheels
B. Rear wheels
C. Front and rear wheels
D. Propeller shaft

View Answer

Question 168

The advantage of the fuel injection system over the carburettor system is

A. Improved fuel efficiency
B. Improved emission
C. Improved power output
D. All of these

View Answer

Question 169

The function of an alternator in an automobile is to

A. Supply electric power
B. Converts mechanical energy into electrical energy
C. Continually recharges the battery
D. Partly converts engine power into electric power

View Answer

Question 170

Which of the following indicates multi-grade oil?

A. SAE 30
B. API SF
C. SAE20 W50
D. API 50

View Answer

Question 171

A heat treated glass generally used in automobiles bursts into ________ upon cracking,

A. Sharp edged fragments
B. Small particles
C. Large particles
D. None of these

View Answer

Question 172

The main function of an exhaust muffler is the

A. Optimization of exhaust efficiency
B. Reduction of exhaust noise
C. Reduction of nitrogen oxide in the exhaust gases
D. Reduction of the exhaust gas volume

View Answer

Question 173

The brake pedal during ABS operation

A. Is pushed upward forcefully
B. Pedal stroke becomes longer
C. Transmits slight kickback to the driver's foot
D. All of the above

View Answer

Question 174

The self ignition temperature of Diesel as compared to petrol is

A. Higher
B. Lower
C. Same
D. Depends on fuel quality

View Answer

Question 175

The purpose of adding pigment to the paint is that it

A. Optimises the viscosity of paint
B. Makes paint film hard
C. Gives colour and filling up effect to the paint
D. None of the above

View Answer

Question 176

Which one of the following statements correctly describes the construction of a planetary gear type differential?

A. The six planetary pinions rotate in constant mesh with the internal gears.
B. One drive shaft is splined to the central gear and the other to the planetary gear.
C. Each planetary pinion gear meshes with both the central gear and the internal gear.
D. The internal gear is fixed to the planetary gear.

View Answer

Question 177

During braking, the brake shoe is moved outward to force the lining against the

A. Wheel piston or cylinder
B. Anchor pin
C. Brake drum
D. Wheel rim or axle

View Answer

Question 178

The temperature indicating instrument in vehicles indicates the temperature of

A. Engine piston
B. Engine cylinder
C. Lubricating oil
D. Jacket cooling water

View Answer

Question 179

The stroke of an engine is the

A. Volume of the cylinder
B. Length of the connecting rod
C. Internal diameter of the cylinder
D. Distance between T.D.C. and B.D.C.

View Answer

Question 180

The most commonly used power plant in automobiles is

A. Gas turbine
B. I.C. engine
C. Battery
D. None of these

View Answer

Question 181

The characteristic that is enhanced by the use of cylinder sleeves is

A. Cooling efficiency
B. Resistance to wear
C. Lubrication performance
D. None of these

View Answer

Question 182

The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crankcase, is known as

A. Cleaning
B. Priming
C. Scavenging
D. Detonation

View Answer

Question 183

The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

A. Enable the pump's fault diagnosis function to operate
B. Warm up and lubricate the pump
C. Supplies a large amount of fuel and thereby creates a choke effect
D. Pressurise the fuel system before the engine is started

View Answer

Question 184

Which of the following parameter can be adjusted by modifying the tie rod attachment length?

A. Camber
B. Caster
C. Toe
D. Steering gear ratio

View Answer

Question 185

The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is

A. Brake pedal, master cylinder, brake lines, vacuum servo mechanism, brake pads
B. Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads
C. Brake pedal, master cylinder, vacuum servo mechanism, brake lines, brake pads
D. Brake pedal, brake lines, vacuum servo mechanism, master cylinder, brake pads

View Answer

Question 186

The basic purpose of tyre rotation on automobiles is to

A. Avoid ply separation
B. Equalize wear
C. Get better ride
D. None of these

View Answer

Question 187

Damper in an automobile is used to

A. Absorb the energy
B. Dissipate the energy
C. Release the energy
D. Increase the energy

View Answer

Question 188

The difference between DOT 3 and DOT 4 brake fluids is

A. DOT 4 fluid has a higher boiling point than DOT 3 fluid
B. DOT 4 fluid has a lower boiling point than DOT 3 fluid
C. DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
D. DOT 4 fluid is more resistant to freezing than DOT 3 fluid

View Answer

Question 189

The co-efficient of rolling resistance for a truck weighing 63 500 N is 0.018. The rolling resistance to the truck is

A. 1.143 N
B. 11.43 N
C. 114.3 N
D. 1143 N

View Answer

Question 190

When the piston is at T.D.C., the volume above the piston in the combustion chamber is the

A. Clearance volume
B. Cylinder volume
C. Exhaust volume
D. None of these

View Answer

Question 191

The condition that causes vapour locking in a brake system is

A. overheating of the fluid due to frequent brake application
B. overcooling of the brakes during high speed driving
C. keeping the vehicle without use for an extended period
D. an excessively high engine speed on a downhill road

View Answer

Question 192

Which part of the automobile tyre is subjected to greatest flexing action?

A. Bead
B. Side wall
C. Shoulder
D. Tread

View Answer

Question 193

If the engine coolant leaks into the engine oil, then engine oil

A. appears milky
B. becomes foamy
C. turns black
D. none of these

View Answer

Question 194

The function of anti-lock brake system (ABS) is that is

A. Reduces the stopping distance
B. Minimizes the brake fade
C. Maintains directional control during braking by preventing the wheels from locking
D. Prevents nose dives during braking and thereby postpones locking of the wheels

View Answer

Question 195

The component that is responsible for converting the rotation of the steering wheel into lateral motion is the

A. Steering wheel
B. Steering shaft
C. Steering gearbox
D. Tie rod

View Answer

Question 196

When the front wheels of a vehicle are locked during braking, then

A. Stopping distance becomes extremely long
B. Front tyres skid across the road surface, and the vehicle spins around
C. Rear tyres skid across the road surface, and the vehicle spins around
D. Driver loses control over the steering, and the vehicle continues moving in its current direction

View Answer

Question 197

The clutch is located between the transmission and the

A. Engine
B. Rear axle
C. Propeller shaft
D. Differential

View Answer

Question 198

The effect of vapour locking on the brake performance is that the

A. Brakes function more effectively
B. Brakes fail completely
C. Brake operation is delayed after depression of the brake pedal
D. Vapour locking has no effect on brake performance

View Answer

Question 199

The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

A. Absorb the vibrations transferred from the surface of the road
B. Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
C. Absorb any difference in speed between the left and right wheels when the vehicle is turning
D. None of the above

View Answer

Question 200

The vehicle ride will be comfortable if

A. unsprung mass is kept minimum
B. sprang mass is kept minimum
C. vehicle mass is kept minimum
D. all of these

View Answer

Question 201

The oil pump is driven by the

A. camshaft
B. alternator shaft
C. crankshaft via drive belt
D. crankshaft directly

View Answer

Question 202

The path taken by intake air is

A. Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders
B. Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
C. Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders
D. Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders

View Answer

Question 203

A three way catalytic converter

A. Re-circulates exhaust gases
B. Burns fuel vapour gases
C. Reduces N₂, H₂O, and CO₂ emission levels
D. Removes CO, HC, and NO₂ from the exhaust gases passing through it

View Answer

Question 204

The main function of the tread pattern on tyre is that

A. the tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
B. the crests between the tread grooves absorb road noise
C. in wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
D. the tread pattern protects the tyre's inner carcass from small stones and pieces of glass

View Answer

Question 205

The number of exhaust manifolds in a V6 engine is

A. One
B. Two
C. Four
D. Eight

View Answer

Question 206

The Diesel engines as compared to petrol engines require

A. Bigger flywheel
B. Smaller flywheel
C. Same size of flywheel
D. No flywheel

View Answer

Question 207

The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)

A. P.L.A.N/2
B. P.L.A.N
C. 2 × P.L.A.N
D. P.L.A.N/4

View Answer

Question 208

Two general types of tyres are

A. Tube type and tubeless
B. Solid and tubeless
C. Air and pneumatic
D. Split rim and drop centre

View Answer

Question 209

The main purpose of an engine's air cleaner is that it

A. Controls the engine's air intake volume
B. Reduces the engine's air intake noise
C. Prevents rain water from entering the engine
D. Prevents dust and other foreign matter from entering the engine

View Answer

Question 210

Bead wires are made of

A. Steel
B. Copper
C. Zinc
D. Aluminium

View Answer

Question 211

The octane number of compressed natural gas (CNG) is

A. 90
B. 100
C. 110
D. 120

View Answer

Question 212

The discharged lead acid battery has on its plates

A. Lead peroxide (PbO₂)
B. Spongy lead (Pb)
C. Lead sulphate (PbSO₄)
D. Sulphuric acid (H₂SO₄)

View Answer

Question 213

The combustion process in a Diesel engine is a

A. Constant volume process
B. Constant pressure process
C. Constant temperature process
D. Adiabatic process

View Answer

Question 214

The basic purpose of tyres is to

A. Grip the road and provide good traction
B. Substitute for springs
C. Act as brake
D. None of these

View Answer

Question 215

In case of a Diesel car, the pressure at the end of compression is of the order of

A. 15 bar
B. 25 bar
C. 35 bar
D. 45 bar

View Answer

Question 216

Vulcanizing means

A. Heating rubber under pressure
B. Spraying with special paint
C. Melting rubber while stirring it
D. None of these

View Answer

Question 217

The caster is called positive when the top of the king pin is inclined to the

A. Rear of the vehicle
B. Front of the vehicle
C. Left of the vehicle
D. Right of the vehicle

View Answer

Question 218

The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as

A. indicator diagram
B. axial force diagram
C. valve timing diagram
D. none of these

View Answer

Question 219

The condition that results in large quantities of HC emission is

A. High temperature combustion
B. Incomplete combustion
C. Low temperature combustion
D. High atmospheric temperature combustion

View Answer

Question 220

The rating of C.I. engine fuel (Diesel) is given by

A. Octane number
B. Performance number
C. Cetane number
D. None of these

View Answer

Question 221

If the engine coolant leaks into the engine oil, then engine oil

A. Appears milky
B. Become foamy
C. Turns black
D. None of these

View Answer

Question 222

An engine has a clearance volume of 100 cm³ and a swept volume of 800 cm³. The compression ratio is

A. 7 : 1
B. 8 : 1
C. 9 : 1
D. 10 : 1

View Answer

Question 223

The two kinds of piston rings are

A. Compression and oil control rings
B. Compression and sliding seal rings
C. Oil scrapper and oil control rings
D. Pressure and sealing rings

View Answer

Question 224

The motion of the cam is transferred to the valves through

A. pistons
B. rocker arms
C. camshaft pulley
D. valve stems

View Answer

Question 225

The correct way to rectify an imbalanced wheel is to

A. Adjust the tyre pressure
B. Rotate the tyres
C. Adjust the damper spring tension
D. Attach appropriate weights to the wheel at appropriate positions

View Answer

Question 226

Two speed reverse gear arrangements is generally provided in case of

A. Passenger cars
B. Matadors
C. Tractors
D. Trucks

View Answer

Question 227

When the top of the wheel is tilted outward, then it is called

A. Positive camber
B. Negative camber
C. Positive caster
D. Negative caster

View Answer

Question 228

The negative terminal post on the top of a battery is

A. Smaller than the positive terminal post
B. Larger than the positive terminal post
C. Of the same size as the positive terminal post
D. None of these

View Answer

Question 229

The most effective method of controlling S.I. engine exhaust emission is by

A. Recirculating exhaust
B. Using catalytic converter
C. Using some additives in the fuel
D. None of these

View Answer

Question 230

In a Diesel engine, the fuel is ignited by

A. An electric spark
B. The heat of compression
C. The hot exhaust
D. None of these

View Answer

Question 231

The Diesel engine works on

A. Otto cycle
B. Carnot cycle
C. Diesel cycle
D. Rankine cycle

View Answer

Question 232

The function of a radiator fan in the cooling system is that

A. It blows air through the radiator when necessary
B. It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
C. It cools the engine by blowing air onto the cylinder block
D. It draws heat out of the engine compartment

View Answer

Question 233

The main feature of Macpherson strut suspension is that

A. The vertical size of the suspension can be made more compact
B. Non vertical external forces are supported by the suspension arms
C. The unsprung mass in lighter
D. The assembly is slightly more complicated in design

View Answer

Question 234

The petrol engines are also known as

A. spark ignition (S.I.) engines
B. compression ignition (C.I.) engines
C. steam engines
D. none of these

View Answer

Question 235

If the level of tension in the belt is too high, it can result in a loss of power or in bending of the rotating shaft or crankshaft.

A. Correct
B. Incorrect

View Answer

Question 236

The natural gas is compressed in a CNG cylinder at a pressure of

A. 200 bar
B. 220 bar
C. 250 bar
D. 300 bar

View Answer

Question 237

In a Diesel engine, the function of a fuel injector is to

A. Mix the fuel and air
B. Ignite the air-fuel mixture
C. Provide flame front for ignition
D. Spray atomized fuel in the cylinder

View Answer

Question 238

The three basic cylinder arrangements for automotive engines are

A. Flat, radial, and V
B. In a row, in line, and opposed
C. In line, V, and opposed
D. V, double row, and opposed

View Answer

Question 239

The calorific value of Diesel is about

A. 36.5 MJ/kg
B. 38.5 MJ/kg
C. 42.5 MJ/kg
D. 45.5 MJ/kg

View Answer

Question 240

The main function of the brake fluid is

A. Lubrication
B. Power transmission
C. Cooling
D. None of these

View Answer

Question 241

The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is

A. 1.143 N
B. 11.43 N
C. 114.3 N
D. 1143 N

View Answer

Question 242

In Spark Ignition Engine

A. Only air is introduced into the cylinder
B. The mixture of air and fuel is introduced into the cylinder from carburettor
C. Both (A) and (B)
D. None of these

View Answer

Question 243

Cushioning springs in clutch plate reduces

A. Vehicle speed
B. Torsional vibrations
C. Jerky starts
D. None of these

View Answer

Question 244

The compression ratio in petrol engine is kept less than in Diesel engine because

A. it makes petrol engines lighter
B. higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
C. less compression ratio gives better performance
D. it is just customary to have less compression ratio in petrol engines

View Answer

Question 245

A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is

A. 8.091 Nm
B. 80.91 Nm
C. 809.1 Nm
D. 8091 Nm

View Answer

Question 246

Which of the following is not a part of the chassis?

A. Wheels
B. Front axle
C. Steering system
D. Seats

View Answer

Question 247

Engine misfiring is likely to result from

A. Spark plug gap too small
B. Spark plug gap too wide
C. Vapours lock in the fuel only
D. Incorrect fuel air mixture

View Answer

Question 248

The seat belt tensioners are built in the

A. Front seats
B. Shoulder anchors
C. Seat belt retractors
D. Seat belt buckles

View Answer

Question 249

Valve overlap is the number of degrees of camshaft rotation during which

A. Both valves are closed
B. Both valves are open
C. Both 'A' and 'B'
D. None of these

View Answer

Question 250

The function of a second ring is that it is a

A. Back up compression ring which will work in place of the top ring when it is broken
B. Compression ring and aids the top ring in sealing and cooling
C. Back up oil control ring which will work in place of the bottom ring when it is broken
D. Cushion ring which prevents piston slap and knock

View Answer

Question 251

The basic characteristics of a brake fluid is

A. A high boiling point
B. Low viscosity
C. Compatibility with rubber and metal parts
D. All of these

View Answer

Question 252

The function of a first compression ring (top ring) is that it

A. Increases the combustion temperature
B. Creates swirl
C. Maintains a seal and prevents the fuel leakage
D. Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

View Answer

Question 253

The function of a connecting rod is

A. To turn the flywheel
B. To drive the drive plate
C. To drive the fuel pump
D. To transmit motion of the piston to the crankshaft

View Answer

Question 254

An imbalance wheel during vehicle operation

A. Makes large noise when its heavy point hits the road surface
B. Deflects in the vehicle's longitudinal direction
C. Bounces vertically or deflects from side to side (as seen from front or rear)
D. Creates a standing wave

View Answer

Question 255

A battery can be charged by

A. Adding distilled water
B. Adding sulphuric acid
C. Applying voltage in the reverse direction to that of charging
D. Applying a voltage in the same direction to that of charging

View Answer

Question 256

The ignition in a spark ignition engine takes place when the piston is

A. Exactly at the T.D.C. position on its compression stroke
B. Approaching the T.D.C. position on its compression stroke
C. Leaving the T.D.C. position on its compression stroke
D. Approaching the T.D.C position on its exhaust stroke

View Answer

Question 257

In Diesel engines, the duration between the time of injection and the time of ignition is called

A. Spill cut-off
B. Delay period
C. Injection period
D. Ignition period

View Answer

Question 258

The compression ratio for Diesel engines usually lies in the range of

A. 6-10
B. 10-15
C. 15-25
D. 25-40

View Answer

Question 259

The specific gravity of acid in a fully charged battery is generally

A. 1
B. 1.28
C. 1.82
D. 2.81

View Answer

Question 260

The compression ratio of a petrol engine is nearly

A. 4:1
B. 8:1
C. 15:1
D. 20:1

View Answer

Question 261

Which of the following is not an automobile?

A. Motor cycle
B. Passenger car
C. Aeroplane
D. Truck

View Answer

Question 262

In a square type engine

A. Geometrical shape is square
B. Diameter and length of piston are same
C. Two cylinders are placed horizontal and two vertical
D. Stroke length and cylinder bore are same

View Answer

Question 263

The most accurate ignition system of a spark ignition engine is

A. Magneto system
B. Battery system
C. Electronic control unit system
D. Magneto and electronic system

View Answer

Question 264

In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as

A. Release chamber
B. Balancer
C. Relief valve
D. Stop valve

View Answer

Question 265

The major purpose of an electronically controlled automatic transmission is that this type of transmission

A. Eliminates gear clutches
B. Eliminates the gear shaft lever
C. Reduces the number of automatic transmission components
D. Reduces shift shock and achieves more efficient transmission of engine torque

View Answer

Question 266

Clutch facings are usually attached to the plate by

A. Steel rivets
B. Brass rivets
C. Aluminium screws
D. Steel screws

View Answer

Question 267

The frequency of flashing of light per minute in a direction (side turn) indicator is about

A. 9
B. 90
C. 900
D. 9000

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Question 268

When the battery is half (50%) charged, the specific gravity of acid in a battery is usually

A. 0.74
B. 1
C. 1.12
D. 1.19

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Question 269

The advantage of double-wishbone suspension design is that a large amount of freedom is available for setting geometry and precise settings can be made for driving comfort and steerability,

A. Correct
B. Incorrect

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Question 270

The temperature at which tyre inflation pressure should be checked is

A. 20°C
B. 25°C
C. 35°C
D. Ambient temperature

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Question 271

In a fuel injection system, the electronic control module (ECM) calculates the optimum fuel-injection volume for the engine condition based on the data received from the sensors, and injects this volume of fuel into the intake manifold at the optimum timing.

A. Correct
B. Incorrect

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Question 272

The heat transfer from coolant to air in the radiator of an automobile engine takes place by

A. Radiation only
B. Convention only
C. Convection and radiation
D. Conduction, convection and radiation

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Question 273

In a ventilated disc brake

A. A duct directs air towards the caliper for cooling while the vehicle is moving
B. Caliper is covered with cooling fins
C. Disc contains many small holes for optimum cooling performance
D. Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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Question 274

In an engine, the temperature of the piston will be more at the

A. Crown of the piston
B. Skirt of the piston
C. Piston walls
D. Piston rings

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Question 275

The acid used in automobile battery is

A. Hydrochloric acid
B. Hydrofluoric acid
C. Nitric acid
D. Sulphuric acid

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Question 276

The octane rating of petrol commercially available is

A. 85-95
B. 95-100
C. 100-110
D. 110-125

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Question 277

The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called

A. Camber
B. Caster
C. Toe in
D. Toe out

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Question 278

The ball joints are used on the tie rod ends, because they

A. Reduce the amount of noise generated
B. Reduce the amount of sliding resistance
C. Can deal with movement of the suspension both vertically and in other directions
D. Improve the force transmission speed

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Question 279

With the increase of battery temperature, the specific gravity of electrolyte

A. Increases
B. Decreases
C. Remains the same
D. None of these

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Question 280

The antiknock property of compression ignition engine fuel can be improved by adding

A. Tetraethyl lead
B. Trimethyl pentane
C. Amyl nitrate
D. Hexadecane

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Question 281

The most commonly used supplementary restraint system (SRS) component is

A. seat belt
B. brake
C. airbag
D. steering

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Question 282

The forced fed lubrication system means that the oil is delivered to the engine by

A. Gravity
B. The pressure created by the oil pump
C. Splashing action of the crankshaft
D. None of these

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Question 283

The operation of removing trapped air from the hydraulic braking system is known as

A. trapping
B. tapping
C. bleeding
D. cleaning

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Question 284

Damper is also known as

A. Shock absorber
B. Torsion bar
C. Spring
D. Radius rod

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Question 285

The ignition coil is used to

A. Step up current
B. Step down current
C. Step up voltage
D. Step down voltage

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Question 286

The sequence order of events in a four stroke engine is

A. Suction exhaust power compression
B. Suction power compression exhaust
C. Suction compression power exhaust
D. Exhaust compression power suction

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Question 287

The advantage of a tubeless tyre over tube type tyre is

A. Slow air leakage
B. Better fuel efficiency
C. Less chances of running flat
D. All of these

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Question 288

The portion of a crankshaft which rests on cylinder block is called main journal.

A. Yes
B. No

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Question 289

The starter motor is driven by

A. Chain drive
B. Gear drive
C. Flat belt drive
D. V-belt drive

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Question 290

The advantage of having a tandem master cylinder arrangement in automobiles is that it

A. Enhances safety by serving two independent lines in a divided line brake circuit
B. Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
C. Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side
D. Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

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Question 291

The commonly used antifreeze solution in automobiles is

A. Carbon disulphide
B. Ethylene glycol
C. Ammonium chloride
D. Freon-12

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Question 292

In a four wheel drive (4WD), the numbers of gear boxes are

A. 1
B. 2
C. 3
D. 4

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Question 293

A basic difference between the spark ignition engine and the Diesel engine is that the

A. Diesel engine compresses air alone instead of an air-fuel mixture
B. Air temperature ignites the fuel in the Diesel engine
C. Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
D. All of the above

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Question 294

The torque converter uses ________ to transfer torque.

A. Air
B. Automatic transmission fluid (ATF)
C. Gears
D. Steel belt

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Question 295

The lubrication oil flow in an engine is in the order as

A. Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan
B. Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan
C. Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan
D. Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan

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Question 296

When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate

A. Brake power
B. Compression ratio
C. Specific air consumption
D. Mean effective pressure

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Question 297

The effect of having excess camber is

A. excessive steering alignment torque
B. hard steering
C. too much traction
D. uneven tyre wear

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Question 298

The size of engine cylinder is referred in terms of its

A. Diameter and bore
B. Displacement and efficiency
C. Bore and stroke
D. Bore and length

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Question 299

In comparison with a radial tyre, one advantage of a bias ply tyre is

A. Longer life
B. Lower rolling resistance
C. Smoother ride at low speeds
D. None of these

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Question 300

The air gap between the central electrode and ground (or side) electrode of a spark plug is around

A. 0.2 mm
B. 0.5 mm
C. 1 mm
D. 1.5 mm

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Question 301

The fuel that detonates easily, is

A. N-heptane
B. Iso-octane
C. Benzene
D. Alcohol

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Question 302

The petrol engine works on

A. Otto cycle
B. Carnot cycle
C. Diesel cycle
D. Rankine cycle

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Question 303

The negative plates of a lead acid battery has

A. Lead peroxide (PbO₂)
B. Spongy lead (Pb)
C. Lead sulphate (PbSO₄)
D. Sulphuric acid (H₂SO₄)

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Question 304

The basic purpose of a four wheel drive (4WD) system is that it

A. Delivers improved cornering on dry road surfaces
B. Eliminates the need of snow tyres, tyre chains, etc.
C. Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
D. Ensures that effective braking can be performed, even on slippery surfaces

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Question 305

A front stabilizer bar is used to

A. Increase vehicle load carrying capacity
B. Provide a softer ride
C. Control suspension movement and body roll
D. All of the above

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