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

Feeds blow by gases to the exhaust manifold

Mixes fuel with air

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

Returns blow by gases from the crankcase to the intake system

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

Supply electricity to the alternator

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

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

Act as a reservoir or stabilizer of electricity

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

Section width to section height

Section height to section width

Wheel diameter to section height

Wheel diameter to section width

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

Ceramic

Cast iron

Brass

Aluminium

5. 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

Scavenging

Detonation

Auto ignition

6. The two kinds of piston rings are

Oil scrapper and oil control rings

Compression and oil control rings

Compression and sliding seal rings

Pressure and sealing rings

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

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

Less compression ratio gives better performance

It makes petrol engines lighter

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

8. The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings

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

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

Planetary gear

Hydraulic multi plate clutch

Synchronizer

Magnetic clutch

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

Front of the vehicle

Right of the vehicle

Rear of the vehicle

Left of the vehicle

Page 2 of 4

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

Reduces the engine's air intake noise

Controls the engine's air intake volume

Prevents dust and other foreign matter from entering the engine

Prevents rain water from entering the engine

12. In Spark Ignition Engine

(A) Only air is introduced into the cylinder

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

(C) Both (A) and (B)

(D) None of these Correct Answer

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

Higher

Same

Lower

Depends on fuel quality

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

Remains the same

Increases

None of these

Decreases

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

Shot peening

Boring

Honing

Porous plating

16. Free pedal play in car clutches is about

25 mm

15 mm

40 mm

60 mm

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

Balancer

Relief valve

Stop valve

Release chamber

18. The piston compression rings are made of

Cast iron

Aluminium

Steel

Bronze

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

SAE 30

API 50

API SF

SAE20 W50

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

Indicate the coolant temperature

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

Allow the engine to warm up quickly

Page 3 of 4

21. The service brakes employed in cars are generally operated

None of these

Mechanically

Hydraulically

Pneumatically

22. 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, vacuum servo mechanism, master cylinder, brake lines, brake pads

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

23. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

24. 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

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

300bar

200bar

220bar

250bar

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

6-10

15-20

10-15

25-40

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

Free plays of the steering wheel

Turning radius of the left and right wheels

Difference in the toe angles of the left and right wheels

Contact areas of the tyres

28. 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

29. 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

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

Flywheel

Differential

Torque converter

Clutch

Page 4 of 4

31. The basic characteristics of a brake fluid is

Low viscosity

Compatibility with rubber and metal parts

A high boiling point

All of these

32. The main function of a master cylinder is to

Boost the force applied to brake pedal

Convert brake pedal force into hydraulic pressure

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

Adjust the extent of brake pedal free play

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

90°

60°

120°

30°

34. 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

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

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

Delivers improved cornering on dry road surfaces

35. The ignition coil is used to

Step down voltage

Step up current

Step up voltage

Step down current

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

100°C to 120°C

120°C to 180°C

70°C to 100°C

180°C to 360 °C

37. The exhaust gas from petrol engine contains

All of these

Petrol vapours

Water vapours

Carbon monoxide

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

9000

900

90

9

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

1-3-2-4

1-2-3-4

1-4-3-2

1-3-4-2

40. 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 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

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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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