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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-4

May 4, 2021

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Page 1 of 4

1. The exhaust gas from petrol engine contains

Carbon monoxide

Water vapours

All of these

Petrol vapours

2. The basic characteristics of a brake fluid is

Low viscosity

All of these

Compatibility with rubber and metal parts

A high boiling point

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

It draws heat out of the engine compartment

It blows air through the radiator when necessary

It cools the engine by blowing air onto the cylinder block

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

4. 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

Cleaning

Detonation

Priming

Scavenging

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

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

Delivers improved cornering on dry road surfaces

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

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

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

Right of the vehicle

Left of the vehicle

Rear of the vehicle

Front of the vehicle

7. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

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

Synchronizer

Magnetic clutch

Hydraulic multi plate clutch

Planetary gear

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

Mixes fuel with air

Returns blow by gases from the crankcase to the intake system

Feeds blow by gases to the exhaust manifold

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

10. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

Adjust the extent of brake pedal free play

Boost the force applied to brake pedal

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

Page 2 of 4

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

166.94 N

16.694 N

1.6694 N

1669.4 N

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

Clutch

Torque converter

Differential

Flywheel

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

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

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

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

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

14. Free pedal play in car clutches is about

60 mm

40 mm

15 mm

25 mm

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

220bar

300bar

200bar

250bar

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

Free plays of the steering wheel

Contact areas of the tyres

Turning radius of the left and right wheels

Difference in the toe angles of the left and right wheels

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

Prevents dust and other foreign matter from entering the engine

Controls the engine's air intake volume

Reduces the engine's air intake noise

Prevents rain water from entering the engine

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

Relief valve

Release chamber

Stop valve

Balancer

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

Wheel diameter to section width

Wheel diameter to section height

Section width to section height

Section height to section width

20. In Spark Ignition Engine

(C) Both (A) and (B)

(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

Page 3 of 4

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

90°

60°

30°

120°

22. 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

Detonation

Supercharging

Auto ignition

Scavenging

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

9000

900

9

90

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

1-4-3-2

1-3-2-4

1-3-4-2

1-2-3-4

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

Convention only

Convection and radiation

Conduction, convection and radiation

Radiation only

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

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

Act as a reservoir or stabilizer of electricity

Supply electricity to the alternator

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

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

Increases

None of these

Decreases

Remains the same

28. The two kinds of piston rings are

Compression and oil control rings

Oil scrapper and oil control rings

Pressure and sealing rings

Compression and sliding seal rings

29. The service brakes employed in cars are generally operated

Mechanically

Pneumatically

None of these

Hydraulically

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

180°C to 360 °C

100°C to 120°C

70°C to 100°C

120°C to 180°C

Page 4 of 4

31. The ignition coil is used to

Step up current

Step up voltage

Step down current

Step down voltage

32. The piston compression rings are made of

Steel

Cast iron

Aluminium

Bronze

33. The purpose of a balancer shaft is to

Reduce vibrations caused by the crankshaft rotation

Increase inertia force of the rotating crankshaft

Adjusts the timing of the intake and exhaust valve openings

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

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

Less compression ratio gives better performance

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

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

It makes petrol engines lighter

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

15-20

6-10

10-15

25-40

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

API 50

API SF

SAE 30

SAE20 W50

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

Cast iron

Brass

Aluminium

Ceramic

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

Shot peening

Honing

Porous plating

Boring

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

Lower

Higher

Same

Depends on fuel quality

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

Pressurise the system to raise the boiling point

Indicate the coolant temperature

Allow the engine to warm up quickly

Prevent the coolant from boiling

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Tags: Automobile Automobile Engineering MCQs Engineering Mechanical Engineering

VideRime

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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