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

Exhaust gas volume

Air flow speed

Air-fuel ratio

Air temperature

2. Which of the following oil is more viscous?

SAE 30

SAE 40

SAE 70

SAE 80

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

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

Adjust the damper spring tension

Rotate the tyres

4. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

Reduces intake noise

Cools the intake air to a suitable temperature

5. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Extreme length of the vehicle

Distance between the centres of the rear tyres

Distance between the centres of the front and rear wheels

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

Head light bulb

Parking light bulb

Ignition warning bulb

Stop light bulb

7. The power source for a brake booster is

Exhaust manifold pressure

Electricity

Hydraulic pump

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

8. The brake pedal during ABS operation

Pedal stroke becomes longer

Is pushed upward forcefully

All of the above

Transmits slight kickback to the driver's foot

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

The drive shafts are splined to the differential carrier.

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

The differential carrier houses differential pinion gears and side gears.

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

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

Trucks

Passenger cars

Tractors

Matadors

Page 2 of 5

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

5%

15%

20%

10%

12. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Freon-12

Ammonium chloride

Carbon disulphide

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

Operates the clutch

Selects the synchronizer

Meshes the gears

Moves the synchronizer

14. The valve tappet clearance is measured by

Vernier caliper

Screw pitch gauge

Feeler gauge

Engineering scale

15. Cushioning springs in clutch plate reduces

Vehicle speed

Torsional vibrations

None of these

Jerky starts

16. Odometer is an instrument used for measurement of

Fuel consumption

Distance

Engine r.p.m.

Power

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

100

110

120

90

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

None of these

Larger than the positive terminal post

Of the same size as the positive terminal post

Smaller than the positive terminal post

19. The specific gravity of petrol is about

0.85

0.95

0.75

1.25

20. 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)

P.L.A.N

P.L.A.N/2

2 × P.L.A.N

P.L.A.N/4

Page 3 of 5

21. The function of a governor in automobiles is to

Limit the power

Limit the vehicle speed

Maintain constant engine speed

Maximise the fuel economy

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

Prevent uneven tyre wear

Maintain directional control

Compensate for wear in the steering linkage

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

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

175

65

14

82

24. The specific gravity of Diesel is about

0.95

0.85

0.65

0.75

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

Belt driven by crankshaft

Belt driven by drive-shaft

Belt driven by camshaft

Chain driven by crankshaft

26. The Diesel engine works on

Rankine cycle

Diesel cycle

Otto cycle

Carnot cycle

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

2.81

1.00

1.82

1.28

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

1-3-2-4

1-2-3-4

1-3-4-2

1-2-4-3

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

Crank arm

Journal

Big end

Small end

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

All of these

Improved fuel efficiency

Improved power output

Improved emission

Page 4 of 5

31. The parking brake generally acts on

Front and rear wheels

Front wheels

Rear wheels

Propeller shaft

32. The Diesel engines are also known as

Spark ignition (S.I.) engines

None of these

Steam engines

Compression ignition (C.I.) engines

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

Continually recharges the battery

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Supply electric power

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

The vehicle to pull to the side of lesser inclination

Generation of a braking effect at tight corners

Poor recovery of the steering wheel after making a turn

Tendency to assume toe-out orientation

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

Clearance volume

Cylinder volume

None of these

Exhaust volume

36. Bead wires are made of

Copper

Zinc

Aluminium

Steel

37. Engine misfiring is likely to result from

Incorrect fuel air mixture

Spark plug gap too small

Vapours lock in the fuel only

Spark plug gap too wide

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

Sharp edged fragments

Large particles

None of these

Small particles

39. The effect of having excess camber is

Too much traction

Uneven tyre wear

Hard steering

Excessive steering alignment torque

40. Tachometer in a vehicle measures

Engine r.p.m.

Speed

Distance

Fuel consumption

Page 5 of 5

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

Gravity

None of these

The pressure created by the oil pump

Splashing action of the crankshaft

42. The fuel that detonates easily, is

N-heptane

Iso-octane

Benzene

Alcohol

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

Ineffectiveness of the brakes

Rapid wearing of the brake pads

Judder during braking

Localized wearing of the brake pads

44. The ease with which petrol vaporizes is called its

Volatility

Oxidation

Cetane number

Octane number

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

None of these

Overheating of the engine

Incomplete valve closure

Fouling of spark plug by gasoline

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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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