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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-6

August 8, 2021

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Page 1 of 5

1. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

Reduces intake noise

Distributes intake air equally to the cylinders

2. The power source for a brake booster is

The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold

Electricity

Exhaust manifold pressure

Hydraulic pump

3. The function of a governor in automobiles is to

Maximise the fuel economy

Maintain constant engine speed

Limit the vehicle speed

Limit the power

4. The specific gravity of petrol is about

0.75

1.25

0.95

0.85

5. The fuel that detonates easily, is

N-heptane

Iso-octane

Benzene

Alcohol

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

None of these

Clearance volume

Exhaust volume

Cylinder volume

7. Bead wires are made of

Zinc

Aluminium

Copper

Steel

8. The basic purpose of providing caster angle on wheels is to

Maintain directional control

Prevent uneven tyre wear

Bring the road contact of the tyre under the point of load

Compensate for wear in the steering linkage

9. The parking brake generally acts on

Rear wheels

Propeller shaft

Front and rear wheels

Front wheels

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

Belt driven by drive-shaft

Chain driven by crankshaft

Belt driven by crankshaft

Belt driven by camshaft

Page 2 of 5

11. The Diesel engines are also known as

Steam engines

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

12. The commonly used antifreeze solution in automobiles is

Freon-12

Ethylene glycol

Ammonium chloride

Carbon disulphide

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

None of these

Large particles

Small particles

Sharp edged fragments

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

1.82

1.28

2.81

1.00

15. The brake pedal during ABS operation

Pedal stroke becomes longer

All of the above

Transmits slight kickback to the driver's foot

Is pushed upward forcefully

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

Incomplete valve closure

Overheating of the engine

Fouling of spark plug by gasoline

None of these

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

Parking light bulb

Ignition warning bulb

Stop light bulb

Head light bulb

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

10%

5%

15%

20%

19. Cushioning springs in clutch plate reduces

Vehicle speed

None of these

Jerky starts

Torsional vibrations

20. The Diesel engine works on

Diesel cycle

Otto cycle

Rankine cycle

Carnot cycle

Page 3 of 5

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

Air temperature

Air-fuel ratio

Exhaust gas volume

Air flow speed

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

Gravity

The pressure created by the oil pump

None of these

Splashing action of the crankshaft

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

Crank arm

Big end

Journal

Small end

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

Improved fuel efficiency

All of these

Improved power output

Improved emission

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

Localized wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

Rapid wearing of the brake pads

26. The ease with which petrol vaporizes is called its

Oxidation

Cetane number

Volatility

Octane number

27. Two speed reverse gear arrangements is generally provided in case of

Trucks

Passenger cars

Tractors

Matadors

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

Operates the clutch

Meshes the gears

Moves the synchronizer

Selects the synchronizer

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

1-3-4-2

1-2-3-4

1-2-4-3

1-3-2-4

30. The negative terminal post on the top of a battery is

Smaller than the positive terminal post

Of the same size as the positive terminal post

Larger than the positive terminal post

None of these

Page 4 of 5

31. 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)

2 × P.L.A.N

P.L.A.N

P.L.A.N/2

P.L.A.N/4

32. The correct way to rectify an imbalanced wheel is to

Adjust the tyre pressure

Adjust the damper spring tension

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

33. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Distance between the centres of the rear tyres

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

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

65

14

82

175

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

Tendency to assume toe-out orientation

Poor recovery of the steering wheel after making a turn

Generation of a braking effect at tight corners

The vehicle to pull to the side of lesser inclination

36. The octane number of compressed natural gas (CNG) is

100

90

110

120

37. The specific gravity of Diesel is about

0.65

0.95

0.75

0.85

38. The effect of having excess camber is

Excessive steering alignment torque

Too much traction

Uneven tyre wear

Hard steering

39. Odometer is an instrument used for measurement of

Power

Fuel consumption

Distance

Engine r.p.m.

40. The function of an alternator in an automobile is to

Supply electric power

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Continually recharges the battery

Page 5 of 5

41. Which one of the following statement correctly describes the construction of a bevel gear type differential?

The differential carrier houses differential pinion gears and side gears.

The drive shafts are splined to the differential carrier.

The left side gear and the differential carrier rotate in constant unison.

The differential carrier houses differential pinion gears and side gears; each pinion gear meshes with a different side gear.

42. Engine misfiring is likely to result from

Spark plug gap too wide

Vapours lock in the fuel only

Spark plug gap too small

Incorrect fuel air mixture

43. Tachometer in a vehicle measures

Distance

Speed

Fuel consumption

Engine r.p.m.

44. The valve tappet clearance is measured by

Screw pitch gauge

Vernier caliper

Engineering scale

Feeler gauge

45. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 70

SAE 40

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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