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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

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

A. Yes
B. No

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Question 2

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

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Question 3

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

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Question 4

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 5

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

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Question 6

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

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Question 7

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

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Question 8

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

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Question 9

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 10

The cetane rating of Diesel fuel is in the order of

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

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Question 11

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

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Question 12

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

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Question 13

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 14

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

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Question 15

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

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Question 16

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

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Question 17

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

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Question 18

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

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Question 19

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

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Question 20

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 21

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

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Question 22

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

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

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Question 23

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 24

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

A. Yes
B. No

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Question 25

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

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Question 26

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 27

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

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Question 28

The motion of the cam is transferred to the valves through

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

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Question 29

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

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Question 30

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

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Question 31

The valve overlap in four stroke petrol engines is approximately

A. 30°
B. 60°
C. 90°
D. 120°

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Question 32

Which of the following indicates a multigrade oil ?

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

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Question 33

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.


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Question 34

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 35

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

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Question 36

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

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Question 37

The cetane number of a Diesel fuel is a measure of

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

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Question 38

The oil pump is driven by the

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

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Question 39

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

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Question 40

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 41

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.


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Question 42

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

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Question 43

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

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Question 44

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

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Question 45

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 46

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

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Question 47

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

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Question 48

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 49

The coefficient of friction for the clutch facing is approximately

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

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Question 50

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

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