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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 Diesel engine works on

Carnot cycle

Diesel cycle

Otto cycle

Rankine cycle

2. Tachometer in a vehicle measures

Fuel consumption

Speed

Distance

Engine r.p.m.

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

1-2-3-4

1-2-4-3

1-3-4-2

1-3-2-4

4. The commonly used antifreeze solution in automobiles is

Ammonium chloride

Carbon disulphide

Ethylene glycol

Freon-12

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

Improved power output

All of these

Improved fuel efficiency

Improved emission

6. The fuel that detonates easily, is

Benzene

Iso-octane

N-heptane

Alcohol

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

2.81

1.00

1.82

1.28

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

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

Adjust the damper spring tension

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

65

175

82

14

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

Generation of a braking effect at tight corners

Poor recovery of the steering wheel after making a turn

Tendency to assume toe-out orientation

The vehicle to pull to the side of lesser inclination

Page 2 of 5

11. The function of a governor in automobiles is to

Limit the power

Limit the vehicle speed

Maintain constant engine speed

Maximise the fuel economy

12. The Diesel engines are also known as

Compression ignition (C.I.) engines

Steam engines

None of these

Spark ignition (S.I.) engines

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

Converts mechanical energy into electrical energy

Partly converts engine power into electric power

Supply electric power

Continually recharges the battery

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

Belt driven by crankshaft

Belt driven by camshaft

Belt driven by drive-shaft

Chain driven by crankshaft

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

None of these

Of the same size as the positive terminal post

Larger than the positive terminal post

Smaller than the positive terminal post

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

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

Maintain directional control

Prevent uneven tyre wear

Compensate for wear in the steering linkage

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

Tractors

Trucks

Passenger cars

Matadors

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

120

100

90

110

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

Air-fuel ratio

Air flow speed

Exhaust gas volume

Air temperature

20. Odometer is an instrument used for measurement of

Power

Fuel consumption

Engine r.p.m.

Distance

Page 3 of 5

21. 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

22. Which of the following oil is more viscous?

SAE 70

SAE 30

SAE 80

SAE 40

23. The ease with which petrol vaporizes is called its

Octane number

Volatility

Cetane number

Oxidation

24. The brake pedal during ABS operation

All of the above

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

Pedal stroke becomes longer

25. The specific gravity of petrol is about

0.95

1.25

0.75

0.85

26. 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.

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

Sharp edged fragments

Large particles

None of these

Small particles

28. Wheel base of a vehicle is the

Distance between the centres of the rear tyres

Distance between the centres of the front tyres

Extreme length of the vehicle

Distance between the centres of the front and rear wheels

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

15%

10%

20%

5%

30. Bead wires are made of

Copper

Steel

Aluminium

Zinc

Page 4 of 5

31. Engine misfiring is likely to result from

Incorrect fuel air mixture

Spark plug gap too wide

Spark plug gap too small

Vapours lock in the fuel only

32. The valve tappet clearance is measured by

Screw pitch gauge

Feeler gauge

Vernier caliper

Engineering scale

33. The power source for a brake booster is

Electricity

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

Hydraulic pump

Exhaust manifold pressure

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

Incomplete valve closure

Overheating of the engine

None of these

Fouling of spark plug by gasoline

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

None of these

Gravity

The pressure created by the oil pump

Splashing action of the crankshaft

36. 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

37. The effect of having excess camber is

Uneven tyre wear

Excessive steering alignment torque

Hard steering

Too much traction

38. The parking brake generally acts on

Front wheels

Rear wheels

Propeller shaft

Front and rear wheels

39. Cushioning springs in clutch plate reduces

Vehicle speed

None of these

Torsional vibrations

Jerky starts

40. The main function of intake manifold is that it

Cools the intake air to a suitable temperature

Reduces intake noise

Distributes intake air equally to the cylinders

Promotes the mixture of air and fuel

Page 5 of 5

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

Small end

Crank arm

Journal

Big end

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

Moves the synchronizer

Meshes the gears

Operates the clutch

Selects the synchronizer

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

None of these

Cylinder volume

Exhaust volume

Clearance volume

44. The specific gravity of Diesel is about

0.85

0.95

0.65

0.75

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

Judder during braking

Rapid wearing of the brake pads

Localized wearing of the brake pads

Ineffectiveness of the brakes

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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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