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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. Engine misfiring is likely to result from

Spark plug gap too wide

Spark plug gap too small

Vapours lock in the fuel only

Incorrect fuel air mixture

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

Compensate for wear in the steering linkage

Maintain directional control

Prevent uneven tyre wear

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

3. The function of a governor in automobiles is to

Maximise the fuel economy

Limit the power

Maintain constant engine speed

Limit the vehicle speed

4. The power source for a brake booster is

Hydraulic pump

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

Electricity

Exhaust manifold pressure

5. Bead wires are made of

Zinc

Copper

Steel

Aluminium

6. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Freon-12

Ammonium chloride

Carbon disulphide

7. Odometer is an instrument used for measurement of

Engine r.p.m.

Power

Distance

Fuel consumption

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

65

82

175

14

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

None of these

Large particles

Small particles

Sharp edged fragments

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

Big end

Journal

Small end

Crank arm

Page 2 of 5

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

Adjust the tyre pressure

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

Rotate the tyres

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

Continually recharges the battery

Partly converts engine power into electric power

Supply electric power

Converts mechanical energy into electrical energy

13. The parking brake generally acts on

Propeller shaft

Front wheels

Front and rear wheels

Rear wheels

14. The fuel that detonates easily, is

Benzene

N-heptane

Alcohol

Iso-octane

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

The pressure created by the oil pump

Splashing action of the crankshaft

Gravity

None of these

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

Moves the synchronizer

Selects the synchronizer

Operates the clutch

Meshes the gears

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

Improved power output

Improved emission

All of these

Improved fuel efficiency

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

10%

5%

20%

15%

19. Tachometer in a vehicle measures

Engine r.p.m.

Fuel consumption

Distance

Speed

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)

2 × P.L.A.N

P.L.A.N/4

P.L.A.N/2

P.L.A.N

Page 3 of 5

21. The brake pedal during ABS operation

All of the above

Pedal stroke becomes longer

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

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

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

The vehicle to pull to the side of lesser inclination

Poor recovery of the steering wheel after making a turn

23. Cushioning springs in clutch plate reduces

Jerky starts

Vehicle speed

None of these

Torsional vibrations

24. The Diesel engines are also known as

Steam engines

None of these

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

25. The Diesel engine works on

Otto cycle

Rankine cycle

Diesel cycle

Carnot cycle

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

1.28

2.81

1.82

1.00

27. 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

28. The specific gravity of Diesel is about

0.75

0.85

0.65

0.95

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

Larger than the positive terminal post

Of the same size as the positive terminal post

None of these

Smaller than the positive terminal post

30. The ease with which petrol vaporizes is called its

Cetane number

Oxidation

Volatility

Octane number

Page 4 of 5

31. The valve tappet clearance is measured by

Engineering scale

Feeler gauge

Vernier caliper

Screw pitch gauge

32. Which of the following oil is more viscous?

SAE 70

SAE 30

SAE 80

SAE 40

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

Rapid wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

Localized wearing of the brake pads

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

Ignition warning bulb

Stop light bulb

Head light bulb

Parking light bulb

35. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

Distance between the centres of the rear tyres

36. 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

37. The main function of intake manifold is that it

Reduces intake noise

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

Distributes intake air equally to the cylinders

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

Air-fuel ratio

Exhaust gas volume

Air temperature

Air flow speed

39. The specific gravity of petrol is about

0.85

0.75

1.25

0.95

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

Chain driven by crankshaft

Belt driven by camshaft

Belt driven by crankshaft

Belt driven by drive-shaft

Page 5 of 5

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

1-2-4-3

1-3-4-2

1-2-3-4

1-3-2-4

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

Matadors

Passenger cars

Tractors

Trucks

43. The effect of having excess camber is

Hard steering

Excessive steering alignment torque

Too much traction

Uneven tyre wear

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

120

90

110

100

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

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.

The differential carrier houses differential pinion gears and side gears.

The drive shafts are splined to the differential carrier.

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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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