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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. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 40

SAE 70

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

1-2-3-4

1-3-2-4

1-3-4-2

1-2-4-3

3. The specific gravity of petrol is about

0.75

0.85

1.25

0.95

4. Engine misfiring is likely to result from

Spark plug gap too small

Vapours lock in the fuel only

Spark plug gap too wide

Incorrect fuel air mixture

5. The commonly used antifreeze solution in automobiles is

Carbon disulphide

Ethylene glycol

Freon-12

Ammonium chloride

6. 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

7. The brake pedal during ABS operation

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

All of the above

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

82

65

14

175

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

Adjust the damper spring tension

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

Rotate the tyres

10. The function of a governor in automobiles is to

Maximise the fuel economy

Limit the power

Limit the vehicle speed

Maintain constant engine speed

Page 2 of 5

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

Gravity

The pressure created by the oil pump

Splashing action of the crankshaft

None of these

12. The specific gravity of Diesel is about

0.75

0.65

0.95

0.85

13. The fuel that detonates easily, is

Alcohol

Benzene

Iso-octane

N-heptane

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

Of the same size as the positive terminal post

Larger than the positive terminal post

Smaller than the positive terminal post

None of these

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

Overheating of the engine

Incomplete valve closure

Fouling of spark plug by gasoline

None of these

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

Small particles

Large particles

None of these

Sharp edged fragments

17. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Distributes intake air equally to the cylinders

Reduces intake noise

Promotes the mixture of air and fuel

18. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

Distance between the centres of the front tyres

19. Tachometer in a vehicle measures

Distance

Fuel consumption

Engine r.p.m.

Speed

20. The effect of having excess camber is

Excessive steering alignment torque

Too much traction

Hard steering

Uneven tyre wear

Page 3 of 5

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

2.81

1.82

1.28

1.00

22. Bead wires are made of

Copper

Steel

Zinc

Aluminium

23. The valve tappet clearance is measured by

Vernier caliper

Engineering scale

Screw pitch gauge

Feeler gauge

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

None of these

Cylinder volume

Clearance volume

Exhaust volume

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

20%

5%

15%

10%

26. Cushioning springs in clutch plate reduces

Jerky starts

None of these

Vehicle speed

Torsional vibrations

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

Belt driven by drive-shaft

Belt driven by crankshaft

Belt driven by camshaft

Chain driven by crankshaft

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

Passenger cars

Matadors

Tractors

Trucks

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

Journal

Crank arm

Big end

Small end

30. The ease with which petrol vaporizes is called its

Volatility

Cetane number

Octane number

Oxidation

Page 4 of 5

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

Poor recovery of the steering wheel after making a turn

The vehicle to pull to the side of lesser inclination

Generation of a braking effect at tight corners

Tendency to assume toe-out orientation

32. 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/2

P.L.A.N/4

P.L.A.N

33. The parking brake generally acts on

Rear wheels

Propeller shaft

Front and rear wheels

Front wheels

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

Air flow speed

Exhaust gas volume

Air temperature

Air-fuel ratio

35. The Diesel engine works on

Rankine cycle

Carnot cycle

Otto cycle

Diesel cycle

36. 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.

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.

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

120

100

90

110

38. The Diesel engines are also known as

Steam engines

None of these

Spark ignition (S.I.) engines

Compression ignition (C.I.) engines

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

Partly converts engine power into electric power

Supply electric power

Converts mechanical energy into electrical energy

Continually recharges the battery

40. Odometer is an instrument used for measurement of

Power

Fuel consumption

Engine r.p.m.

Distance

Page 5 of 5

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

Improved fuel efficiency

All of these

Improved emission

Improved power output

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

Head light bulb

Ignition warning bulb

Stop light bulb

Parking light bulb

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

Rapid wearing of the brake pads

Localized wearing of the brake pads

Ineffectiveness of the brakes

Judder during braking

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

Compensate for wear in the steering linkage

Prevent uneven tyre wear

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

Maintain directional control

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

Operates the clutch

Selects the synchronizer

Moves the synchronizer

Meshes the gears

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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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