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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 specific gravity of acid in a fully charged battery is generally

1.28

2.81

1.82

1.00

2. The ease with which petrol vaporizes is called its

Volatility

Cetane number

Oxidation

Octane number

3. 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

Smaller than the positive terminal post

None of these

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

None of these

Sharp edged fragments

Small particles

Large particles

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

Ignition warning bulb

Head light bulb

Stop light bulb

Parking light bulb

6. 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

7. 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.

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.

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

Overheating of the engine

Incomplete valve closure

None of these

Fouling of spark plug by gasoline

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

Cylinder volume

None of these

Clearance volume

Exhaust volume

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

Air temperature

Air flow speed

Air-fuel ratio

Exhaust gas volume

Page 2 of 5

11. The specific gravity of Diesel is about

0.85

0.65

0.95

0.75

12. Tachometer in a vehicle measures

Distance

Speed

Fuel consumption

Engine r.p.m.

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

Improved emission

Improved fuel efficiency

Improved power output

All of these

14. 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/2

P.L.A.N/4

P.L.A.N

2 × P.L.A.N

15. 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

16. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Freon-12

Carbon disulphide

Ammonium chloride

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

Compensate for wear in the steering linkage

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

Prevent uneven tyre wear

Maintain directional control

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

Crank arm

Journal

Big end

Small end

19. Engine misfiring is likely to result from

Vapours lock in the fuel only

Incorrect fuel air mixture

Spark plug gap too small

Spark plug gap too wide

20. Cushioning springs in clutch plate reduces

None of these

Torsional vibrations

Jerky starts

Vehicle speed

Page 3 of 5

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

Rotate the tyres

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

22. Odometer is an instrument used for measurement of

Fuel consumption

Power

Distance

Engine r.p.m.

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

Meshes the gears

Selects the synchronizer

Moves the synchronizer

Operates the clutch

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

120

110

90

100

25. Wheel base of a vehicle is the

Distance between the centres of the front and rear wheels

Distance between the centres of the rear tyres

Extreme length of the vehicle

Distance between the centres of the front tyres

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

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

Supply electric power

Continually recharges the battery

27. The power source for a brake booster is

Hydraulic pump

Electricity

Exhaust manifold pressure

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

28. The parking brake generally acts on

Rear wheels

Front wheels

Propeller shaft

Front and rear wheels

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

1-2-3-4

1-3-4-2

1-3-2-4

1-2-4-3

30. Bead wires are made of

Steel

Aluminium

Copper

Zinc

Page 4 of 5

31. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

Reduces intake noise

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

5%

20%

15%

10%

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

175

14

65

82

34. Which of the following oil is more viscous?

SAE 30

SAE 70

SAE 80

SAE 40

35. The Diesel engines are also known as

Steam engines

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

36. 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 drive-shaft

Belt driven by crankshaft

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

Judder during braking

Rapid wearing of the brake pads

Ineffectiveness of the brakes

Localized wearing of the brake pads

38. The Diesel engine works on

Otto cycle

Diesel cycle

Rankine cycle

Carnot cycle

39. The fuel that detonates easily, is

Iso-octane

Alcohol

Benzene

N-heptane

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

Splashing action of the crankshaft

Gravity

The pressure created by the oil pump

None of these

Page 5 of 5

41. The function of a governor in automobiles is to

Maintain constant engine speed

Limit the vehicle speed

Limit the power

Maximise the fuel economy

42. The specific gravity of petrol is about

1.25

0.95

0.75

0.85

43. The effect of having excess camber is

Hard steering

Too much traction

Excessive steering alignment torque

Uneven tyre wear

44. The valve tappet clearance is measured by

Screw pitch gauge

Feeler gauge

Engineering scale

Vernier caliper

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

Trucks

Matadors

Tractors

Passenger cars

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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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