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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 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

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

Less compression ratio gives better performance

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

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

Front of the vehicle

Left of the vehicle

Right of the vehicle

Rear of the vehicle

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

Increases

Decreases

Remains the same

None of these

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

220bar

250bar

300bar

200bar

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

SAE20 W50

API SF

SAE 30

API 50

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

25-40

6-10

10-15

15-20

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

Aluminium

Ceramic

Brass

Cast iron

9. 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

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

Contact areas of the tyres

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

Page 2 of 4

11. 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

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

Release chamber

Balancer

Relief valve

Stop valve

13. 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

Auto ignition

Supercharging

14. 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

15. The exhaust gas from petrol engine contains

Petrol vapours

Carbon monoxide

Water vapours

All of these

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

Porous plating

Honing

Shot peening

Boring

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

Planetary gear

Magnetic clutch

Synchronizer

Hydraulic multi plate clutch

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

Same

Lower

Depends on fuel quality

Higher

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

Wheel diameter to section height

Section height to section width

Wheel diameter to section width

Section width to section height

20. The basic characteristics of a brake fluid is

Low viscosity

All of these

Compatibility with rubber and metal parts

A high boiling point

Page 3 of 4

21. The discharged lead acid battery has on its plates

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

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

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

It draws heat out of the engine compartment

23. Free pedal play in car clutches is about

25 mm

40 mm

60 mm

15 mm

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

Clutch

Flywheel

Differential

Torque converter

25. 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

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

Convention only

Conduction, convection and radiation

Convection and radiation

Radiation only

27. The two kinds of piston rings are

Compression and sliding seal rings

Pressure and sealing rings

Oil scrapper and oil control rings

Compression and oil control rings

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

1669.4 N

16.694 N

166.94 N

1.6694 N

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

9000

900

9

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, vacuum servo mechanism, brake lines, brake pads

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

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

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

Page 4 of 4

31. 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.

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

Prevents dust and other foreign matter from entering the engine

Prevents rain water from entering the engine

Controls the engine's air intake volume

Reduces the engine's air intake noise

33. 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

34. In Spark Ignition Engine

(C) Both (A) and (B)

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

(D) None of these Correct Answer

(A) Only air is introduced into the cylinder

35. The ignition coil is used to

Step down current

Step down voltage

Step up current

Step up voltage

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

1-3-4-2

1-4-3-2

1-2-3-4

1-3-2-4

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

Allow the engine to warm up quickly

Indicate the coolant temperature

Prevent the coolant from boiling

Pressurise the system to raise the boiling point

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

30°

60°

120°

90°

39. The service brakes employed in cars are generally operated

Pneumatically

None of these

Mechanically

Hydraulically

40. The piston compression rings are made of

Steel

Bronze

Cast iron

Aluminium

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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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