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Automobile Engineering MCQs
2

Automobile Engineering Practice Set-4

May 4, 2021

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Page 1 of 4

1. The ignition coil is used to

Step down voltage

Step up voltage

Step up current

Step down current

2. In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as

Balancer

Stop valve

Relief valve

Release chamber

3. The self ignition temperature of Diesel as compared to petrol is

Same

Lower

Higher

Depends on fuel quality

4. The basic purpose of a four wheel drive (4WD) system is that it

Eliminates the need of snow tyres, tyre chains, etc.

Ensures that effective braking can be performed, even on slippery surfaces

Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces

Delivers improved cornering on dry road surfaces

5. The reconditioning process used to give cylinder bore surfaces a crosshatch pattern, is known as

Porous plating

Shot peening

Boring

Honing

6. The firing order for an opposed four cylinder l.C. engine is

1-3-4-2

1-2-3-4

1-3-2-4

1-4-3-2

7. The basic characteristics of a brake fluid is

All of these

Low viscosity

Compatibility with rubber and metal parts

A high boiling point

8. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

9. The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crankcase, is known as

Priming

Detonation

Cleaning

Scavenging

10. The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is

Brake pedal, brake lines, vacuum servo mechanism, master cylinder, brake pads

Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads

Brake pedal, master cylinder, vacuum servo mechanism, brake lines, brake pads

Brake pedal, master cylinder, brake lines, vacuum servo mechanism, brake pads

Page 2 of 4

11. The function of a radiator fan in the cooling system is that

It draws heat out of the engine compartment

It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump

It cools the engine by blowing air onto the cylinder block

It blows air through the radiator when necessary

12. The purpose of a balancer shaft is to

Reduce vibrations caused by the crankshaft rotation

Increase inertia force of the rotating crankshaft

Balance the timing in the movement of the two groups of pistons

Adjusts the timing of the intake and exhaust valve openings

13. The compression ratio for Diesel engines usually lies in the range of

15-20

10-15

25-40

6-10

14. In Spark Ignition Engine

(A) Only air is introduced into the cylinder

(D) None of these Correct Answer

(B) The mixture of air and fuel is introduced into the cylinder from carburettor

(C) Both (A) and (B)

15. The two kinds of piston rings are

Compression and oil control rings

Compression and sliding seal rings

Oil scrapper and oil control rings

Pressure and sealing rings

16. The device for smoothening out the power impulses from the engine is called

Flywheel

Torque converter

Differential

Clutch

17. The caster is called positive when the top of the king pin is inclined to the

Right of the vehicle

Rear of the vehicle

Left of the vehicle

Front of the vehicle

18. In order to implement gear changes in the gear unit of an automatic transmission, a ___________ is used.

Synchronizer

Planetary gear

Hydraulic multi plate clutch

Magnetic clutch

19. The purpose of a thermostat in an engine cooling system is to

Prevent the coolant from boiling

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

Indicate the coolant temperature

20. The main purpose of an engine's air cleaner is that it

Prevents dust and other foreign matter from entering the engine

Reduces the engine's air intake noise

Controls the engine's air intake volume

Prevents rain water from entering the engine

Page 3 of 4

21. The valve overlap in four stroke petrol engines is approximately

60°

120°

90°

30°

22. The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is

1.6694 N

166.94 N

1669.4 N

16.694 N

23. The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as

Supercharging

Detonation

Auto ignition

Scavenging

24. The natural gas is compressed in a CNG cylinder at a pressure of

250bar

200bar

300bar

220bar

25. The function of positive crankcase ventilation (PCV) system is that it

Returns blow by gases from the crankcase to the intake system

Mixes fuel with air

Promotes combustion by creating a swirling movement in the air-fuel mixture

Feeds blow by gases to the exhaust manifold

26. In aluminium cylinder blocks, the cylinder liners are made of

Brass

Aluminium

Cast iron

Ceramic

27. The main function of a master cylinder is to

Ensure that all the wheel brakes are supplied with the same amount of fluid pressure

Adjust the extent of brake pedal free play

Convert brake pedal force into hydraulic pressure

Boost the force applied to brake pedal

28. The frequency of flashing of light per minute in a direction (side turn) indicator is about

9000

9

90

900

29. Free pedal play in car clutches is about

60 mm

25 mm

15 mm

40 mm

30. The compression ratio in petrol engine is kept less than in Diesel engine because

It is just customary to have less compression ratio in petrol engines

Less compression ratio gives better performance

Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

It makes petrol engines lighter

Page 4 of 4

31. The service brakes employed in cars are generally operated

None of these

Pneumatically

Mechanically

Hydraulically

32. The heat transfer from coolant to air in the radiator of an automobile engine takes place by

Radiation only

Convection and radiation

Convention only

Conduction, convection and radiation

33. The boiling point of Diesel fuel is in the range of

100°C to 120°C

180°C to 360 °C

120°C to 180°C

70°C to 100°C

34. With the increase of battery temperature, the specific gravity of electrolyte

None of these

Remains the same

Decreases

Increases

35. The piston compression rings are made of

Aluminium

Cast iron

Steel

Bronze

36. The exhaust gas from petrol engine contains

Petrol vapours

Carbon monoxide

All of these

Water vapours

37. The purpose of turning radius gauges is to measure the

Difference in the toe angles of the left and right wheels

Turning radius of the left and right wheels

Contact areas of the tyres

Free plays of the steering wheel

38. Which of the following indicates multi-grade oil?

SAE20 W50

API SF

API 50

SAE 30

39. The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of

Wheel diameter to section height

Section height to section width

Section width to section height

Wheel diameter to section width

40. The main task of a battery in automobiles is to

Supply a large amount of power to turn the starter motor when the engine is being started

Supply electricity to the alternator

Act as a reservoir or stabilizer of electricity

Supply electricity to the vehicle's electrical system at all times while the engine is running

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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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binance says:
January 16, 2026 at 12:36 pm
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
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免费Binance账户 says:
March 8, 2026 at 4:32 am
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
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