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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 self ignition temperature of Diesel as compared to petrol is

Same

Lower

Depends on fuel quality

Higher

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

Section width to section height

Wheel diameter to section width

Section height to section width

Wheel diameter to section height

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

Controls the engine's air intake volume

Reduces the engine's air intake noise

Prevents rain water from entering the engine

Prevents dust and other foreign matter from entering the engine

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

Magnetic clutch

Planetary gear

Hydraulic multi plate clutch

Synchronizer

5. The two kinds of piston rings are

Compression and oil control rings

Pressure and sealing rings

Compression and sliding seal rings

Oil scrapper and oil control rings

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

Front of the vehicle

Rear of the vehicle

Right of the vehicle

Left of the vehicle

7. The ignition coil is used to

Step up current

Step up voltage

Step down current

Step down voltage

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

Boring

Porous plating

Shot peening

Honing

9. 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

Free plays of the steering wheel

Turning radius of the left and right wheels

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

Cast iron

Ceramic

Brass

Aluminium

Page 2 of 4

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

1-3-2-4

1-4-3-2

1-2-3-4

1-3-4-2

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

30°

60°

120°

90°

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

It makes petrol engines lighter

Less compression ratio gives better performance

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

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

14. In Spark Ignition Engine

(C) Both (A) and (B)

(A) Only air is introduced into the cylinder

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

(D) None of these Correct Answer

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

9

9000

900

90

16. The piston compression rings are made of

Cast iron

Aluminium

Bronze

Steel

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

10-15

15-20

25-40

6-10

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

Remains the same

None of these

Increases

Decreases

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

Differential

Clutch

Flywheel

Torque converter

20. 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

Page 3 of 4

21. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

22. Free pedal play in car clutches is about

15 mm

40 mm

60 mm

25 mm

23. 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

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

Convention only

Conduction, convection and radiation

Radiation only

Convection and radiation

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

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

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

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

300bar

200bar

250bar

220bar

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

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

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

Delivers improved cornering on dry road surfaces

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

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

Stop valve

Balancer

Release chamber

Relief valve

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

API SF

SAE20 W50

API 50

SAE 30

30. The exhaust gas from petrol engine contains

Water vapours

Carbon monoxide

All of these

Petrol vapours

Page 4 of 4

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

166.94 N

16.694 N

1.6694 N

1669.4 N

32. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

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

Boost the force applied to brake pedal

Adjust the extent of brake pedal free play

33. 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

34. 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, 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

35. 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

Scavenging

Auto ignition

Detonation

Supercharging

36. The service brakes employed in cars are generally operated

Pneumatically

None of these

Mechanically

Hydraulically

37. The basic characteristics of a brake fluid is

All of these

Low viscosity

Compatibility with rubber and metal parts

A high boiling point

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

Indicate the coolant temperature

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

39. 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

Detonation

Scavenging

Cleaning

Priming

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

Returns blow by gases from the crankcase to the intake system

Feeds blow by gases to the exhaust manifold

Mixes fuel with air

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

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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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