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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 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

2. 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

It makes petrol engines lighter

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

Less compression ratio gives better performance

3. 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

4. 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

5. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

6. The piston compression rings are made of

Aluminium

Steel

Bronze

Cast iron

7. 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

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

Clutch

Torque converter

Differential

Flywheel

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

90°

60°

30°

120°

10. The main function of a master cylinder is to

Adjust the extent of brake pedal free play

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

Page 2 of 4

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

Controls the engine's air intake volume

Prevents rain water from entering the engine

Reduces the engine's air intake noise

Prevents dust and other foreign matter from entering the engine

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

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

Indicate the coolant temperature

Prevent the coolant from boiling

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

None of these

Increases

Decreases

Remains the same

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

1-3-2-4

1-2-3-4

1-3-4-2

1-4-3-2

15. 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

Section width to section height

Wheel diameter to section height

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

15-20

6-10

25-40

10-15

17. The ignition coil is used to

Step down current

Step up voltage

Step up current

Step down voltage

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

200bar

250bar

300bar

220bar

19. The exhaust gas from petrol engine contains

Water vapours

Petrol vapours

All of these

Carbon monoxide

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

Front of the vehicle

Rear of the vehicle

Left of the vehicle

Right of the vehicle

Page 3 of 4

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

Depends on fuel quality

Higher

Same

Lower

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

16.694 N

1669.4 N

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

Boring

Porous plating

Shot peening

Honing

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

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

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

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

Delivers improved cornering on dry road surfaces

25. The two kinds of piston rings are

Oil scrapper and oil control rings

Compression and sliding seal rings

Pressure and sealing rings

Compression and oil control rings

26. The basic characteristics of a brake fluid is

A high boiling point

Compatibility with rubber and metal parts

All of these

Low viscosity

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

Synchronizer

Hydraulic multi plate clutch

Planetary gear

Magnetic clutch

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

Aluminium

Brass

Cast iron

Ceramic

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

9

900

9000

90

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

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

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

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

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

Page 4 of 4

31. 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

Detonation

Supercharging

32. 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

Scavenging

Priming

Detonation

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

SAE20 W50

API SF

SAE 30

API 50

34. 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

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

Convection and radiation

Convention only

Conduction, convection and radiation

Radiation only

36. Free pedal play in car clutches is about

60 mm

40 mm

15 mm

25 mm

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

Turning radius of the left and right wheels

Free plays of the steering wheel

Contact areas of the tyres

Difference in the toe angles of the left and right wheels

38. In Spark Ignition Engine

(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

(C) Both (A) and (B)

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

70°C to 100°C

100°C to 120°C

180°C to 360 °C

120°C to 180°C

40. The service brakes employed in cars are generally operated

Hydraulically

Pneumatically

Mechanically

None of these

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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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