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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 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

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

SAE20 W50

API SF

API 50

SAE 30

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

Prevents rain water from entering the engine

Reduces the engine's air intake noise

Prevents dust and other foreign matter from entering the engine

Controls the engine's air intake volume

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

Difference in the toe angles of the left and right wheels

Contact areas of the tyres

Turning radius of the left and right wheels

Free plays of the steering wheel

5. Free pedal play in car clutches is about

40 mm

60 mm

25 mm

15 mm

6. 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

Supercharging

Scavenging

Detonation

7. The piston compression rings are made of

Aluminium

Cast iron

Steel

Bronze

8. 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

Less compression ratio gives better performance

It makes petrol engines lighter

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

1-3-4-2

1-2-3-4

1-4-3-2

1-3-2-4

10. 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

Page 2 of 4

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

Magnetic clutch

Synchronizer

Hydraulic multi plate clutch

Planetary gear

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

90

9000

9

900

13. The exhaust gas from petrol engine contains

Petrol vapours

Water vapours

All of these

Carbon monoxide

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

15-20

10-15

25-40

6-10

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

It blows air through the radiator when necessary

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

16. In Spark Ignition Engine

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

(C) Both (A) and (B)

(A) Only air is introduced into the cylinder

(D) None of these Correct Answer

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

Wheel diameter to section height

Section width to section height

Wheel diameter to section width

Section height to section width

18. The ignition coil is used to

Step up voltage

Step up current

Step down current

Step down voltage

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

Release chamber

Relief valve

Stop valve

Balancer

20. The basic characteristics of a brake fluid is

Low viscosity

A high boiling point

Compatibility with rubber and metal parts

All of these

Page 3 of 4

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

Increases

None of these

Decreases

Remains the same

22. 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

Act as a reservoir or stabilizer of electricity

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

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

300bar

250bar

200bar

220bar

24. 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

25. The two kinds of piston rings are

Pressure and sealing rings

Oil scrapper and oil control rings

Compression and oil control rings

Compression and sliding seal rings

26. 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

Scavenging

Cleaning

Priming

Detonation

27. The service brakes employed in cars are generally operated

Pneumatically

None of these

Hydraulically

Mechanically

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

Pressurise the system to raise the boiling point

Indicate the coolant temperature

Allow the engine to warm up quickly

Prevent the coolant from boiling

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

1669.4 N

166.94 N

1.6694 N

16.694 N

30. The discharged lead acid battery has on its plates

Lead peroxide (PbO₂)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Page 4 of 4

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

Right of the vehicle

Front of the vehicle

Left of the vehicle

Rear of the vehicle

32. 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

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

Feeds blow by gases to the exhaust manifold

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

Mixes fuel with air

Returns blow by gases from the crankcase to the intake system

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

Aluminium

Brass

Cast iron

Ceramic

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

Torque converter

Flywheel

Clutch

Differential

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

Honing

Porous plating

Boring

Shot peening

37. The purpose of a balancer shaft is to

Balance the timing in the movement of the two groups of pistons

Reduce vibrations caused by the crankshaft rotation

Increase inertia force of the rotating crankshaft

Adjusts the timing of the intake and exhaust valve openings

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

Depends on fuel quality

Same

Lower

Higher

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

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

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

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

120°

60°

30°

90°

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Tags: Automobile Automobile Engineering MCQs Engineering Mechanical Engineering

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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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