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

Exhaust gas volume

Air-fuel ratio

Air temperature

Air flow speed

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

175

82

65

14

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

Supply electric power

Continually recharges the battery

Partly converts engine power into electric power

Converts mechanical energy into electrical energy

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

15%

10%

5%

20%

5. 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

6. 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

7. The fuel that detonates easily, is

Iso-octane

Benzene

N-heptane

Alcohol

8. 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

9. The parking brake generally acts on

Rear wheels

Propeller shaft

Front wheels

Front and rear wheels

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

Fouling of spark plug by gasoline

Overheating of the engine

None of these

Incomplete valve closure

Page 2 of 5

11. The commonly used antifreeze solution in automobiles is

Ethylene glycol

Freon-12

Carbon disulphide

Ammonium chloride

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

Judder during braking

Ineffectiveness of the brakes

Localized wearing of the brake pads

Rapid wearing of the brake pads

13. 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

Maintain directional control

Prevent uneven tyre wear

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

None of these

Smaller than the positive terminal post

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

Clearance volume

Cylinder volume

Exhaust volume

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

1-3-2-4

1-2-3-4

1-3-4-2

1-2-4-3

18. The Diesel engines are also known as

Spark ignition (S.I.) engines

None of these

Compression ignition (C.I.) engines

Steam engines

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

Stop light bulb

Head light bulb

Parking light bulb

Ignition warning bulb

20. The specific gravity of Diesel is about

0.65

0.75

0.85

0.95

Page 3 of 5

21. Cushioning springs in clutch plate reduces

Torsional vibrations

None of these

Jerky starts

Vehicle speed

22. The valve tappet clearance is measured by

Engineering scale

Feeler gauge

Screw pitch gauge

Vernier caliper

23. The function of a governor in automobiles is to

Limit the power

Maintain constant engine speed

Maximise the fuel economy

Limit the vehicle speed

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

120

110

90

100

25. The effect of having excess camber is

Hard steering

Excessive steering alignment torque

Uneven tyre wear

Too much traction

26. 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.

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

Tendency to assume toe-out orientation

Poor recovery of the steering wheel after making a turn

Generation of a braking effect at tight corners

The vehicle to pull to the side of lesser inclination

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

Improved fuel efficiency

Improved emission

Improved power output

All of these

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

Journal

Big end

Crank arm

Small end

30. Engine misfiring is likely to result from

Incorrect fuel air mixture

Spark plug gap too small

Spark plug gap too wide

Vapours lock in the fuel only

Page 4 of 5

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

Adjust the damper spring tension

Rotate the tyres

Attach appropriate weights to the wheel at appropriate positions

Adjust the tyre pressure

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)

P.L.A.N/2

P.L.A.N/4

2 × P.L.A.N

P.L.A.N

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

Belt driven by drive-shaft

Belt driven by camshaft

Belt driven by crankshaft

Chain driven by crankshaft

34. The main function of intake manifold is that it

Distributes intake air equally to the cylinders

Reduces intake noise

Promotes the mixture of air and fuel

Cools the intake air to a suitable temperature

35. Which of the following oil is more viscous?

SAE 80

SAE 30

SAE 70

SAE 40

36. The brake pedal during ABS operation

Is pushed upward forcefully

Pedal stroke becomes longer

All of the above

Transmits slight kickback to the driver's foot

37. Bead wires are made of

Aluminium

Zinc

Steel

Copper

38. The ease with which petrol vaporizes is called its

Oxidation

Octane number

Volatility

Cetane number

39. Tachometer in a vehicle measures

Fuel consumption

Speed

Distance

Engine r.p.m.

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

Matadors

Passenger cars

Trucks

Tractors

Page 5 of 5

41. Odometer is an instrument used for measurement of

Power

Engine r.p.m.

Distance

Fuel consumption

42. The Diesel engine works on

Diesel cycle

Otto cycle

Carnot cycle

Rankine cycle

43. 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

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

2.81

1.82

1.28

1.00

45. The specific gravity of petrol is about

0.75

0.85

1.25

0.95

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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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