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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 40

SAE 70

SAE 30

2. The ease with which petrol vaporizes is called its

Volatility

Cetane number

Oxidation

Octane number

3. The specific gravity of Diesel is about

0.75

0.65

0.85

0.95

4. Tachometer in a vehicle measures

Speed

Fuel consumption

Engine r.p.m.

Distance

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

Air-fuel ratio

Exhaust gas volume

Air flow speed

Air temperature

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

2.81

1.28

1.00

1.82

7. Bead wires are made of

Copper

Aluminium

Zinc

Steel

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

15%

20%

5%

10%

9. The function of a governor in automobiles is to

Maximise the fuel economy

Limit the power

Maintain constant engine speed

Limit the vehicle speed

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

Small end

Crank arm

Big end

Journal

Page 2 of 5

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

Exhaust volume

Clearance volume

None of these

Cylinder volume

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

Improved emission

All of these

Improved fuel efficiency

Improved power output

13. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

Promotes the mixture of air and fuel

Reduces intake noise

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

Moves the synchronizer

Operates the clutch

Meshes the gears

Selects the synchronizer

15. The parking brake generally acts on

Front and rear wheels

Rear wheels

Propeller shaft

Front wheels

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

110

90

120

100

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

14

65

82

175

18. The Diesel engine works on

Otto cycle

Rankine cycle

Carnot cycle

Diesel cycle

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

Judder during braking

Localized wearing of the brake pads

Ineffectiveness of the brakes

Rapid wearing of the brake pads

20. The specific gravity of petrol is about

0.95

1.25

0.75

0.85

Page 3 of 5

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

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

Prevent uneven tyre wear

Compensate for wear in the steering linkage

Maintain directional control

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

None of these

Fouling of spark plug by gasoline

Overheating of the engine

Incomplete valve closure

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

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

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

The vehicle to pull to the side of lesser inclination

Tendency to assume toe-out orientation

Poor recovery of the steering wheel after making a turn

Generation of a braking effect at tight corners

25. Engine misfiring is likely to result from

Spark plug gap too wide

Incorrect fuel air mixture

Spark plug gap too small

Vapours lock in the fuel only

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

The pressure created by the oil pump

Gravity

Splashing action of the crankshaft

None of these

27. The commonly used antifreeze solution in automobiles is

Freon-12

Carbon disulphide

Ethylene glycol

Ammonium chloride

28. Odometer is an instrument used for measurement of

Fuel consumption

Engine r.p.m.

Distance

Power

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

1-3-2-4

1-2-3-4

1-2-4-3

1-3-4-2

30. The power source for a brake booster is

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

Hydraulic pump

Electricity

Exhaust manifold pressure

Page 4 of 5

31. Cushioning springs in clutch plate reduces

Vehicle speed

Torsional vibrations

None of these

Jerky starts

32. 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

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

Large particles

None of these

Sharp edged fragments

Small particles

34. The Diesel engines are also known as

Compression ignition (C.I.) engines

None of these

Spark ignition (S.I.) engines

Steam engines

35. The fuel that detonates easily, is

Alcohol

Iso-octane

N-heptane

Benzene

36. 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

37. 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

38. The valve tappet clearance is measured by

Screw pitch gauge

Feeler gauge

Engineering scale

Vernier caliper

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

Adjust the damper spring tension

Adjust the tyre pressure

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

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

Belt driven by camshaft

Belt driven by drive-shaft

Belt driven by crankshaft

Chain driven by crankshaft

Page 5 of 5

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

Parking light bulb

Ignition warning bulb

Head light bulb

Stop light bulb

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

Tractors

Trucks

Matadors

Passenger cars

43. The effect of having excess camber is

Excessive steering alignment torque

Hard steering

Too much traction

Uneven tyre wear

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

Supply electric power

Partly converts engine power into electric power

Continually recharges the battery

Converts mechanical energy into electrical energy

45. 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/4

P.L.A.N

P.L.A.N/2

2 × P.L.A.N

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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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