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

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

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

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

Delivers improved cornering on dry road surfaces

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

Lower

Higher

Same

Depends on fuel quality

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

Hydraulic multi plate clutch

Magnetic clutch

Synchronizer

Planetary gear

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

1-3-4-2

1-3-2-4

1-2-3-4

1-4-3-2

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

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

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

6. 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

7. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

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

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

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

Returns blow by gases from the crankcase to the intake system

9. Free pedal play in car clutches is about

15 mm

25 mm

40 mm

60 mm

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

Convention only

Radiation only

Conduction, convection and radiation

Convection and radiation

Page 2 of 4

11. 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

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

9000

90

900

9

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

Torque converter

Flywheel

Clutch

Differential

14. The service brakes employed in cars are generally operated

Hydraulically

Mechanically

Pneumatically

None of these

15. 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

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

It blows air through the radiator when necessary

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 draws heat out of the engine compartment

17. 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

Scavenging

Priming

Cleaning

Detonation

18. The ignition coil is used to

Step down voltage

Step up voltage

Step down current

Step up current

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

220bar

300bar

250bar

200bar

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

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

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

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

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

Page 3 of 4

21. In Spark Ignition Engine

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

(C) Both (A) and (B)

(A) Only air is introduced into the cylinder

(D) None of these Correct Answer

22. The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings

Increase inertia force of the rotating crankshaft

Reduce vibrations caused by the crankshaft rotation

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

23. The main function of a master cylinder is to

Boost the force applied to brake pedal

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

24. The two kinds of piston rings are

Pressure and sealing rings

Compression and oil control rings

Compression and sliding seal rings

Oil scrapper and oil control rings

25. 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

Auto ignition

Scavenging

Supercharging

Detonation

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

10-15

25-40

15-20

6-10

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

Shot peening

Boring

Porous plating

Honing

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

Left of the vehicle

Right of the vehicle

Front of the vehicle

Rear of the vehicle

29. The basic characteristics of a brake fluid is

A high boiling point

Low viscosity

Compatibility with rubber and metal parts

All of these

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

SAE20 W50

API 50

API SF

SAE 30

Page 4 of 4

31. The piston compression rings are made of

Aluminium

Steel

Cast iron

Bronze

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

None of these

Remains the same

Increases

Decreases

33. The exhaust gas from petrol engine contains

Petrol vapours

All of these

Carbon monoxide

Water vapours

34. 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

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

Stop valve

Release chamber

Relief valve

Balancer

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

30°

60°

90°

120°

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

Brass

Ceramic

Aluminium

Cast iron

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

Section height to section width

Wheel diameter to section height

Wheel diameter to section width

Section width to section height

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

1669.4 N

1.6694 N

16.694 N

166.94 N

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

Difference in the toe angles of the left and right wheels

Contact areas of the tyres

Free plays of the steering wheel

Turning radius of the left and right wheels

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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.
Reply

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