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

Decreases

Increases

Remains the same

None of these

2. The exhaust gas from petrol engine contains

Water vapours

Petrol vapours

Carbon monoxide

All of these

3. The discharged lead acid battery has on its plates

Lead peroxide (PbO₂)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

4. The piston compression rings are made of

Bronze

Steel

Cast iron

Aluminium

5. Free pedal play in car clutches is about

60 mm

15 mm

40 mm

25 mm

6. 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

7. In Spark Ignition Engine

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

(D) None of these Correct Answer

(C) Both (A) and (B)

(A) Only air is introduced into the cylinder

8. The service brakes employed in cars are generally operated

None of these

Mechanically

Hydraulically

Pneumatically

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

API SF

API 50

SAE 30

SAE20 W50

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

Lower

Same

Higher

Depends on fuel quality

Page 2 of 4

11. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

Adjust the extent of brake pedal free play

Boost the force applied to brake pedal

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

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

Contact areas of the tyres

Turning radius of the left and right wheels

Free plays of the steering wheel

Difference in the toe angles of the left and right wheels

13. 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

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

10-15

25-40

6-10

15-20

15. 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

Supercharging

Scavenging

Detonation

Auto ignition

16. The basic characteristics of a brake fluid is

A high boiling point

Compatibility with rubber and metal parts

Low viscosity

All of these

17. 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

18. 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

Priming

Cleaning

Detonation

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

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

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

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

It makes petrol engines lighter

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

Page 3 of 4

21. 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

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

Ceramic

Brass

Aluminium

Cast iron

23. The ignition coil is used to

Step up voltage

Step down current

Step up current

Step down voltage

24. 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

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

Boring

Shot peening

Honing

Porous plating

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

Act as a reservoir or stabilizer of electricity

Supply electricity to the alternator

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

Supply a large amount of power to turn the starter motor when the engine is being started

27. The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings

Reduce vibrations caused by the crankshaft rotation

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

Increase inertia force of the rotating crankshaft

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

250bar

200bar

300bar

220bar

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

Differential

Torque converter

Clutch

Flywheel

30. 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

Page 4 of 4

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

Wheel diameter to section width

Wheel diameter to section height

Section height to section width

Section width to section height

32. 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, brake lines, vacuum servo mechanism, brake pads

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

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

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

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

Returns blow by gases from the crankcase to the intake system

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

34. The two kinds of piston rings are

Pressure and sealing rings

Oil scrapper and oil control rings

Compression and sliding seal rings

Compression and oil control rings

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

Prevents dust and other foreign matter from entering the engine

Controls the engine's air intake volume

Reduces the engine's air intake noise

Prevents rain water from entering the engine

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

9000

90

900

9

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

Planetary gear

Synchronizer

Hydraulic multi plate clutch

Magnetic clutch

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

30°

90°

60°

120°

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

It draws heat out of the engine compartment

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

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

180°C to 360 °C

120°C to 180°C

100°C to 120°C

70°C to 100°C

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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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