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
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
Question 2
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
Question 3
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
Question 4
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
Question 5
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
Question 6
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
Question 7
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
Question 8
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
Question 9
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
Question 10
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
Question 11
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
Question 12
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
Question 13
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
Question 14
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
Question 15
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
Question 16
Positive camber is used to compensate for wheels tilting inward due to the weight of the vehicle.
A. Yes
B. No
Question 17
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
Question 18
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
Question 19
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
Question 20
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
Question 21
The cetane number of a Diesel fuel is a measure of
A. volatility
B. viscosity
C. ignition quality
D. delay peirod
Question 22
The cetane rating of Diesel fuel is in the order of
A. 25
B. 45
C. 70
D. 90
Question 23
The coefficient of friction for the clutch facing is approximately
A. 0.1
B. 0.4
C. 0.8
D. 1.2
Question 24
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
Question 25
The component that connects the steering rack to the knuckles is
A. tie-rod
B. sector gear
C. pivot
D. spline
Question 26
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
Question 27
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
Question 28
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
Question 29
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
Question 30
The effect of having excess camber is
A. excessive steering alignment torque
B. hard steering
C. too much traction
D. uneven tyre wear
Question 31
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
Question 32
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
Question 33
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
Question 34
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
Question 35
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
Question 36
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
Question 37
The most commonly used supplementary restraint system (SRS) component is
A. seat belt
B. brake
C. airbag
D. steering
Question 38
The motion of the cam is transferred to the valves through
A. pistons
B. rocker arms
C. camshaft pulley
D. valve stems
Question 39
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
Question 40
The oil pump is driven by the
A. camshaft
B. alternator shaft
C. crankshaft via drive belt
D. crankshaft directly
Question 41
The operation of removing trapped air from the hydraulic braking system is known as
A. trapping
B. tapping
C. bleeding
D. cleaning
Question 42
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
Question 43
The portion of a crankshaft which rests on cylinder block is called main journal.
A. Yes
B. No
Question 44
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
Question 45
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
Question 46
The valve overlap in four stroke petrol engines is approximately
A. 30°
B. 60°
C. 90°
D. 120°
Question 47
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
Question 48
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
Question 49
Which of the following indicates a multigrade oil ?
A. SAE 30
B. API SF
C. SAE 20 W-50
D. API 50
Question 50
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
Question 51
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
Question 52
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
Question 53
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
Question 54
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)
Question 55
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)
Question 56
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
Question 57
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.
Question 58
The seat belt tensioners are built in the
A. Front seats
B. Shoulder anchors
C. Seat belt retractors
D. Seat belt buckles
Question 59
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
Question 60
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
Question 61
The crankshaft of a typical inline four cylinder engine has ________ balance weights.
A. 12
B. 4
C. 16
D. 8
Question 62
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
Question 63
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
Question 64
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
Question 65
Petrol that detonates easily is called
A. High octane petrol
B. Low octane petrol
C. Unleaded petrol
D. Blended fuel
Question 66
The device for smoothening out the power impulses from the engine is called
A. Clutch
B. Differential
C. Flywheel
D. Torque converter
Question 67
The compression ratio of a petrol engine is nearly
A. 4:1
B. 8:1
C. 15:1
D. 20:1
Question 68
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
Question 69
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
Question 70
Damper is also known as
A. Shock absorber
B. Torsion bar
C. Spring
D. Radius rod
Question 71
Which of the following oil is more viscous?
A. SAE 30
B. SAE 40
C. SAE 70
D. SAE 80
Question 72
Which of the following indicates multi-grade oil?
A. SAE 30
B. API SF
C. SAE20 W50
D. API 50
Question 73
One effect of detonation is
A. Delay in ignition
B. Loss of power
C. Overheating of engine
D. Overcooling of engine
Question 74
The main cause for the change in engine oil viscosity is
A. Humidity
B. Temperature
C. Vibration
D. Contamination
Question 75
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
Question 76
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
Question 77
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
Question 78
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
Question 79
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
Question 80
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
Question 81
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
Question 82
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
Question 83
The torque converter uses ________ to transfer torque.
A. Air
B. Automatic transmission fluid (ATF)
C. Gears
D. Steel belt
Question 84
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
Question 85
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
Question 86
In aluminium cylinder blocks, the cylinder liners are made of
A. Aluminium
B. Ceramic
C. Brass
D. Cast iron
Question 87
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
Question 88
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
Question 89
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
Question 90
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
Question 91
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
Question 92
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
Question 93
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
Question 94
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
Question 95
The best fuels for compression ignition engines are
A. Straight chain paraffin
B. Aromatics
C. Branched chain paraffin
D. Naphthalene
Question 96
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
Question 97
The exhaust gas from petrol engine contains
A. Petrol vapours
B. Water vapours
C. Carbon monoxide
D. All of these
Question 98
The petrol engine works on
A. Otto cycle
B. Carnot cycle
C. Diesel cycle
D. Rankine cycle
Question 99
The Diesel engine works on
A. Otto cycle
B. Carnot cycle
C. Diesel cycle
D. Rankine cycle
Question 100
The Diesel engines as compared to petrol engines require
A. Bigger flywheel
B. Smaller flywheel
C. Same size of flywheel
D. No flywheel
Question 101
The cetane number of a Diesel fuel is a measure of
A. Volatility
B. Viscosity
C. Ignition quality
D. Delay period
Question 102
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
Question 103
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
Question 104
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
Question 105
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
Question 106
The material generally used for cylinder sleeves is
A. Aluminium
B. Ceramic
C. Cast iron
D. Fibre reinforced plastic
Question 107
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
Question 108
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
Question 109
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
Question 110
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
Question 111
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
Question 112
The acid used in automobile battery is
A. Hydrochloric acid
B. Hydrofluoric acid
C. Nitric acid
D. Sulphuric acid
Question 113
Damper in an automobile is used to
A. Absorb the energy
B. Dissipate the energy
C. Release the energy
D. Increase the energy
Question 114
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
Question 115
The antiknock property of compression ignition engine fuel can be improved by adding
A. Tetraethyl lead
B. Trimethyl pentane
C. Amyl nitrate
D. Hexadecane
Question 116
The timing belt is attached to the camshaft pulley and
A. Timing belt drive pulley
B. Distributor
C. Radiator fan pulley
D. Alternator pulley
Question 117
The ignition coil is used to
A. Step up current
B. Step down current
C. Step up voltage
D. Step down voltage
Question 118
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
Question 119
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
Question 120
The power actually developed inside the engine cylinder is called as
A. Indicated power
B. Brake power
C. Frictional power
D. None of these
Question 121
The frequency of flashing of light per minute in a direction (side turn) indicator is about
A. 9
B. 90
C. 900
D. 9000
Question 122
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
Question 123
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
Question 124
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
Question 125
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
Question 126
The clutch is located between the transmission and the
A. Engine
B. Rear axle
C. Propeller shaft
D. Differential
Question 127
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
Question 128
The component that connects the steering rack to the knuckles is
A. Tie rod
B. Sector gear
C. Pivot
D. Spline
Question 129
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
Question 130
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
Question 131
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
Question 132
In a four wheel drive (4WD), the numbers of gear boxes are
A. 1
B. 2
C. 3
D. 4
Question 133
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
Question 134
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
Question 135
The fuel that detonates easily, is
A. N-heptane
B. Iso-octane
C. Benzene
D. Alcohol
Question 136
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
Question 137
The maximum torque multiplication ratio in a torque converter is about
A. 2.5
B. 10
C. 25
D. 40
Question 138
Odometer is an instrument used for measurement of
A. Power
B. Fuel consumption
C. Engine r.p.m.
D. Distance
Question 139
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
Question 140
Which of the following is not an automobile?
A. Motor cycle
B. Passenger car
C. Aeroplane
D. Truck
Question 141
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
Question 142
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
Question 143
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
Question 144
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
Question 145
Caster is a
A. Forward tilt of the kingpin
B. Backward tilt of the kingpin
C. Either 'A' or 'B'
D. None of these
Question 146
The valve tappet clearance is measured by
A. Screw pitch gauge
B. Engineering scale
C. Feeler gauge
D. Vernier caliper
Question 147
The parking brakes employed in vehicles are operated
A. Mechanically
B. Hydraulically
C. Pneumatically
D. None of these
Question 148
Free pedal play in car clutches is about
A. 15 mm
B. 25 mm
C. 40 mm
D. 60 mm
Question 149
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
Question 150
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
Question 151
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
Question 152
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
Question 153
The instrument used to check specific gravity of acid in a battery is
A. Hydrometer
B. Hygrometer
C. Anemometer
D. Multimeter
Question 154
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
Question 155
Clutch facings are usually attached to the plate by
A. Steel rivets
B. Brass rivets
C. Aluminium screws
D. Steel screws
Question 156
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
Question 157
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
Question 158
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
Question 159
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
Question 160
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
Question 161
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
Question 162
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
Question 163
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
Question 164
An overinflated tyre will wear the tread most near the
A. Edges
B. Corners
C. Centre
D. None of these
Question 165
The connecting rods are generally made of __________ shaped cross-section.
A. I
B. C
C. L
D. H
Question 166
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
Question 167
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
Question 168
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
Question 169
The service brakes employed in cars are generally operated
A. Mechanically
B. Hydraulically
C. Pneumatically
D. None of these
Question 170
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
Question 171
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
Question 172
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
Question 173
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
Question 174
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
Question 175
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
Question 176
The rating of C.I. engine fuel (Diesel) is given by
A. Octane number
B. Performance number
C. Cetane number
D. None of these
Question 177
The capacity of a battery is usually expressed in terms of
A. Volts
B. Amperes
C. Weight
D. Ampere hours
Question 178
If clearance volume of I.C. engines is increased, the compression ratio will
A. Increase
B. Decrease
C. Remain constant
D. Be doubled
Question 179
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
Question 180
The specific gravity of Diesel is about
A. 0.65
B. 0.75
C. 0.85
D. 0.95
Question 181
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
Question 182
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
Question 183
The specific gravity of petrol is about
A. 0.75
B. 0.85
C. 0.95
D. 1.25
Question 184
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
Question 185
The formula for Iso-octane is
A. C8H18
B. C7H17
C. C6H18
D. C7H18
Question 186
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.
Question 187
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
Question 188
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
Question 189
The parking brake generally acts on
A. Front wheels
B. Rear wheels
C. Front and rear wheels
D. Propeller shaft
Question 190
The tyre rotation is generally done at
A. 1000 km
B. 4000 km
C. 6000 km
D. 10,000 km
Question 191
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
Question 192
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
Question 193
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)
Question 194
The main function of the brake fluid is
A. Lubrication
B. Power transmission
C. Cooling
D. None of these
Question 195
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
Question 196
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
Question 197
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
Question 198
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
Question 199
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
Question 200
The connecting rod connects the piston and the
A. Cylinder head
B. Cylinder block
C. Camshaft
D. Crankshaft
Question 201
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
Question 202
The temperature indicating instrument in vehicles indicates the temperature of
A. Engine piston
B. Engine cylinder
C. Lubricating oil
D. Jacket cooling water
Question 203
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
Question 204
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
Question 205
The minimum parking brake force is generally ___________ of gross vehicle mass (GVM).
A. 5%
B. 10%
C. 15%
D. 20%
Question 206
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
Question 207
The combustion process in a Diesel engine is a
A. Constant volume process
B. Constant pressure process
C. Constant temperature process
D. Adiabatic process
Question 208
The starter motor is driven by
A. Chain drive
B. Gear drive
C. Flat belt drive
D. V-belt drive
Question 209
Two speed reverse gear arrangements is generally provided in case of
A. Passenger cars
B. Matadors
C. Tractors
D. Trucks
Question 210
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
Question 211
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
Question 212
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
Question 213
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
Question 214
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
Question 215
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
Question 216
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
Question 217
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
Question 218
The two rows of cylinders in a 'V' type engine are generally arranged at
A. 45°
B. 60°
C. 90°
D. 130°
Question 219
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
Question 220
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
Question 221
The piston compression rings are made of
A. Cast iron
B. Steel
C. Aluminium
D. Bronze
Question 222
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
Question 223
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
Question 224
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
Question 225
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
Question 226
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
Question 227
The compression ratio for Diesel engines usually lies in the range of
A. 6-10
B. 10-15
C. 15-25
D. 25-40
Question 228
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
Question 229
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
Question 230
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
Question 231
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
Question 232
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
Question 233
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
Question 234
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
Question 235
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
Question 236
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
Question 237
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
Question 238
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
Question 239
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
Question 240
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
Question 241
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
Question 242
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
Question 243
Which part of the automobile tyre is subjected to greatest flexing action?
A. Bead
B. Side wall
C. Shoulder
D. Tread
Question 244
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
Question 245
Which of the following is not a part of the chassis?
A. Wheels
B. Front axle
C. Steering system
D. Seats
Question 246
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
Question 247
Cushioning springs in clutch plate reduces
A. Vehicle speed
B. Torsional vibrations
C. Jerky starts
D. None of these
Question 248
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
Question 249
The specific gravity of acid in a fully charged battery is generally
A. 1
B. 1.28
C. 1.82
D. 2.81
Question 250
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
Question 251
The connecting rod is attached to the piston by the
A. Cap bolt
B. Piston pin
C. Cap roller bearing
D. Rod cap
Question 252
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
Question 253
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
Question 254
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
Question 255
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
Question 256
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
Question 257
With the increase of battery temperature, the specific gravity of electrolyte
A. Increases
B. Decreases
C. Remains the same
D. None of these
Question 258
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
Question 259
The temperature at which tyre inflation pressure should be checked is
A. 20°C
B. 25°C
C. 35°C
D. Ambient temperature
Question 260
In vehicles with tilt steering, the steering column is pivoted in
A. Upper bracket
B. Lower bracket
C. Tilt bracket
D. Steering yoke joint
Question 261
The octane number of compressed natural gas (CNG) is
A. 90
B. 100
C. 110
D. 120
Question 262
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
Question 263
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
Question 264
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
Question 265
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
Question 266
How many cells are used in a 12 volt car battery?
A. 2
B. 4
C. 6
D. 8
Question 267
Vulcanizing means
A. Heating rubber under pressure
B. Spraying with special paint
C. Melting rubber while stirring it
D. None of these
Question 268
Bead wires are made of
A. Steel
B. Copper
C. Zinc
D. Aluminium
Question 269
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
Question 270
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
Question 271
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
Question 272
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.
Question 273
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
Question 274
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
Question 275
Tachometer in a vehicle measures
A. Speed
B. Distance
C. Engine r.p.m.
D. Fuel consumption
Question 276
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
Question 277
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
Question 278
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
Question 279
The connecting rod lower end is connected to the relevant ________ of crankshaft.
A. Big end
B. Crank arm
C. Journal
D. Small end
Question 280
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
Question 281
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
Question 282
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)
Question 283
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
Question 284
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
Question 285
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
Question 286
The octane rating of petrol commercially available is
A. 85-95
B. 95-100
C. 100-110
D. 110-125
Question 287
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
Question 288
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
Question 289
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
Question 290
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
Question 291
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
Question 292
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
Question 293
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
Question 294
The self ignition temperature of Diesel as compared to petrol is
A. Higher
B. Lower
C. Same
D. Depends on fuel quality
Question 295
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
Question 296
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
Question 297
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
Question 298
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
Question 299
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
Question 300
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
Question 301
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
Question 302
The number of exhaust manifolds in a V6 engine is
A. One
B. Two
C. Four
D. Eight
Question 303
The most commonly used power plant in automobiles is
A. Gas turbine
B. I.C. engine
C. Battery
D. None of these
Question 304
The commonly used antifreeze solution in automobiles is
A. Carbon disulphide
B. Ethylene glycol
C. Ammonium chloride
D. Freon-12
Question 305
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