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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 ignition coil is used to

Step down current

Step up current

Step up voltage

Step down voltage

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

60°

30°

90°

120°

3. The main function of a master cylinder is to

Adjust the extent of brake pedal free play

Convert brake pedal force into hydraulic pressure

Boost the force applied to brake pedal

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

4. 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

1.6694 N

166.94 N

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

1-2-3-4

1-3-4-2

1-3-2-4

1-4-3-2

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

900

9000

90

9

7. 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

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

Hydraulic multi plate clutch

Magnetic clutch

Synchronizer

Planetary gear

9. The basic characteristics of a brake fluid is

Compatibility with rubber and metal parts

All of these

A high boiling point

Low viscosity

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

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

Less compression ratio gives better performance

Page 2 of 4

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

None of these

Decreases

Remains the same

Increases

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

Act as a reservoir or stabilizer of electricity

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

Supply electricity to the alternator

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

15-20

10-15

6-10

25-40

14. The two kinds of piston rings are

Pressure and sealing rings

Compression and oil control rings

Oil scrapper and oil control rings

Compression and sliding seal rings

15. The exhaust gas from petrol engine contains

Petrol vapours

Water vapours

Carbon monoxide

All of these

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

Higher

Lower

Depends on fuel quality

Same

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

300bar

220bar

200bar

250bar

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

Conduction, convection and radiation

Radiation only

Convention only

Convection and radiation

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

Shot peening

Porous plating

Honing

Boring

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

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 draws heat out of the engine compartment

It blows air through the radiator when necessary

Page 3 of 4

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

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.

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

22. The piston compression rings are made of

Aluminium

Bronze

Cast iron

Steel

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

Flywheel

Torque converter

Differential

Clutch

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

Rear of the vehicle

Front of the vehicle

Right of the vehicle

Left of the vehicle

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

Reduces the engine's air intake noise

Prevents rain water from entering the engine

Prevents dust and other foreign matter from entering the engine

Controls the engine's air intake volume

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

SAE 30

API SF

API 50

SAE20 W50

27. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

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

Relief valve

Stop valve

Balancer

Release chamber

29. 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

Scavenging

Cleaning

30. Free pedal play in car clutches is about

25 mm

60 mm

15 mm

40 mm

Page 4 of 4

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

Aluminium

Ceramic

Brass

Cast iron

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

Prevent the coolant from boiling

Pressurise the system to raise the boiling point

Indicate the coolant temperature

Allow the engine to warm up quickly

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

Wheel diameter to section width

Section height to section width

Section width to section height

Wheel diameter to section height

34. The service brakes employed in cars are generally operated

None of these

Mechanically

Pneumatically

Hydraulically

35. 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, vacuum servo mechanism, master cylinder, 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

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

Contact areas of the tyres

Free plays of the steering wheel

Difference in the toe angles of the left and right wheels

Turning radius of the left and right wheels

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

120°C to 180°C

180°C to 360 °C

100°C to 120°C

70°C to 100°C

38. 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

39. 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

Detonation

Supercharging

Scavenging

40. 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

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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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