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

Controls the engine's air intake volume

Prevents dust and other foreign matter from entering the engine

Reduces the engine's air intake noise

Prevents rain water from entering the engine

2. 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

3. The purpose of a balancer shaft is to

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

Reduce vibrations caused by the crankshaft rotation

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

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

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

Returns blow by gases from the crankcase to the intake system

5. In Spark Ignition Engine

(C) Both (A) and (B)

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

(A) Only air is introduced into the cylinder

(D) None of these Correct Answer

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

Increases

Remains the same

Decreases

None of these

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

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

It blows air through the radiator when necessary

It draws heat out of the engine compartment

8. 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

Cleaning

Detonation

Scavenging

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

Pressurise the system to raise the boiling point

Allow the engine to warm up quickly

Indicate the coolant temperature

Prevent the coolant from boiling

10. 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

Page 2 of 4

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

9000

900

9

90

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

Supply electricity to the alternator

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

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

Act as a reservoir or stabilizer of electricity

13. 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

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

120°C to 180°C

100°C to 120°C

70°C to 100°C

180°C to 360 °C

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

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

Delivers improved cornering on dry road surfaces

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

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

16. 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

Free plays of the steering wheel

Contact areas of the tyres

17. 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, vacuum servo mechanism, brake lines, brake pads

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

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

18. 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

Scavenging

Supercharging

Auto ignition

19. The exhaust gas from petrol engine contains

Petrol vapours

Water vapours

All of these

Carbon monoxide

20. The piston compression rings are made of

Bronze

Cast iron

Aluminium

Steel

Page 3 of 4

21. The ignition coil is used to

Step down voltage

Step up voltage

Step down current

Step up current

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

Convention only

Convection and radiation

Radiation only

Conduction, convection and radiation

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

Release chamber

Stop valve

Balancer

Relief valve

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

Brass

Ceramic

Aluminium

Cast iron

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

25-40

15-20

6-10

10-15

26. The discharged lead acid battery has on its plates

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

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

Planetary gear

Synchronizer

Magnetic clutch

Hydraulic multi plate clutch

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

Boring

Shot peening

Porous plating

Honing

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

SAE 30

API SF

API 50

SAE20 W50

30. The basic characteristics of a brake fluid is

All of these

Low viscosity

A high boiling point

Compatibility with rubber and metal parts

Page 4 of 4

31. The two kinds of piston rings are

Pressure and sealing rings

Compression and sliding seal rings

Oil scrapper and oil control rings

Compression and oil control rings

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

250bar

300bar

200bar

220bar

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

Same

Lower

Depends on fuel quality

Higher

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

90°

60°

30°

120°

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

Left of the vehicle

Rear of the vehicle

Right of the vehicle

Front of the vehicle

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

Torque converter

Clutch

Differential

Flywheel

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

16.694 N

1.6694 N

166.94 N

1669.4 N

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 width

Wheel diameter to section height

Section width to section height

39. The service brakes employed in cars are generally operated

None of these

Mechanically

Hydraulically

Pneumatically

40. Free pedal play in car clutches is about

25 mm

15 mm

60 mm

40 mm

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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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