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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 30

SAE 80

SAE 70

SAE 40

2. The ease with which petrol vaporizes is called its

Oxidation

Octane number

Volatility

Cetane number

3. 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

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

Exhaust volume

Cylinder volume

None of these

Clearance volume

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

Parking light bulb

Head light bulb

Stop light bulb

Ignition warning bulb

6. The specific gravity of petrol is about

1.25

0.95

0.85

0.75

7. The commonly used antifreeze solution in automobiles is

Freon-12

Carbon disulphide

Ammonium chloride

Ethylene glycol

8. The main function of intake manifold is that it

Promotes the mixture of air and fuel

Distributes intake air equally to the cylinders

Cools the intake air to a suitable temperature

Reduces intake noise

9. The Diesel engines are also known as

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

Steam engines

10. Odometer is an instrument used for measurement of

Distance

Engine r.p.m.

Fuel consumption

Power

Page 2 of 5

11. The specific gravity of Diesel is about

0.65

0.85

0.75

0.95

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

110

90

120

100

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

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

Compensate for wear in the steering linkage

Maintain directional control

Prevent uneven tyre wear

14. 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

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

Chain driven by crankshaft

Belt driven by crankshaft

Belt driven by drive-shaft

Belt driven by camshaft

16. Engine misfiring is likely to result from

Spark plug gap too small

Incorrect fuel air mixture

Vapours lock in the fuel only

Spark plug gap too wide

17. Tachometer in a vehicle measures

Speed

Fuel consumption

Distance

Engine r.p.m.

18. 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

19. Cushioning springs in clutch plate reduces

Torsional vibrations

None of these

Vehicle speed

Jerky starts

20. Wheel base of a vehicle is the

Distance between the centres of the front tyres

Distance between the centres of the rear tyres

Distance between the centres of the front and rear wheels

Extreme length of the vehicle

Page 3 of 5

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

65

14

82

175

22. The brake pedal during ABS operation

Pedal stroke becomes longer

Is pushed upward forcefully

Transmits slight kickback to the driver's foot

All of the above

23. The valve tappet clearance is measured by

Engineering scale

Vernier caliper

Feeler gauge

Screw pitch gauge

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

Attach appropriate weights to the wheel at appropriate positions

Adjust the damper spring tension

Adjust the tyre pressure

Rotate the tyres

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

None of these

Of the same size as the positive terminal post

Smaller than the positive terminal post

Larger than the positive terminal post

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

Gravity

Splashing action of the crankshaft

None of these

The pressure created by the oil pump

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

Improved emission

Improved fuel efficiency

Improved power output

All of these

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

Small end

Crank arm

Journal

Big end

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

Small particles

None of these

Sharp edged fragments

Large particles

30. The Diesel engine works on

Diesel cycle

Carnot cycle

Rankine cycle

Otto cycle

Page 4 of 5

31. 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 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.

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

Continually recharges the battery

Converts mechanical energy into electrical energy

Supply electric power

Partly converts engine power into electric power

33. The effect of having excess camber is

Too much traction

Uneven tyre wear

Hard steering

Excessive steering alignment torque

34. The function of a governor in automobiles is to

Limit the power

Limit the vehicle speed

Maintain constant engine speed

Maximise the fuel economy

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

None of these

Overheating of the engine

Fouling of spark plug by gasoline

Incomplete valve closure

36. The fuel that detonates easily, is

N-heptane

Benzene

Iso-octane

Alcohol

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

2.81

1.82

1.28

1.00

38. Bead wires are made of

Aluminium

Copper

Steel

Zinc

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

Judder during braking

Localized wearing of the brake pads

Rapid wearing of the brake pads

Ineffectiveness of the brakes

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

Selects the synchronizer

Moves the synchronizer

Operates the clutch

Meshes the gears

Page 5 of 5

41. 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

Tendency to assume toe-out orientation

Generation of a braking effect at tight corners

42. The parking brake generally acts on

Rear wheels

Front wheels

Propeller shaft

Front and rear wheels

43. 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/2

P.L.A.N

2 × P.L.A.N

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

10%

5%

20%

15%

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

Tractors

Matadors

Passenger cars

Trucks

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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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