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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 exhaust gas from petrol engine contains

Petrol vapours

Carbon monoxide

Water vapours

All of these

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

Less compression ratio gives better performance

It makes petrol engines lighter

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

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

15-20

25-40

6-10

10-15

4. In Spark Ignition Engine

(C) Both (A) and (B)

(D) None of these Correct Answer

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

(A) Only air is introduced into the cylinder

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

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

Contact areas of the tyres

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

16.694 N

166.94 N

1669.4 N

1.6694 N

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

Honing

Shot peening

Porous plating

Boring

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

900

9

9000

90

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

SAE 30

SAE20 W50

API 50

API SF

10. The purpose of a balancer shaft is to

Reduce vibrations caused by the crankshaft rotation

Adjusts the timing of the intake and exhaust valve openings

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

Increase inertia force of the rotating crankshaft

Page 2 of 4

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

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 blows air through the radiator when necessary

It cools the engine by blowing air onto the cylinder block

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

1-3-2-4

1-3-4-2

1-2-3-4

1-4-3-2

13. 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, master cylinder, brake lines, vacuum servo mechanism, brake pads

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

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

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

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

Indicate the coolant temperature

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

Returns blow by gases from the crankcase to the intake system

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

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

16. The service brakes employed in cars are generally operated

Mechanically

None of these

Pneumatically

Hydraulically

17. The piston compression rings are made of

Steel

Aluminium

Bronze

Cast iron

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

Differential

Clutch

Flywheel

Torque converter

19. 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

Scavenging

Detonation

Cleaning

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

Increases

None of these

Remains the same

Decreases

Page 3 of 4

21. Free pedal play in car clutches is about

25 mm

60 mm

15 mm

40 mm

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

Relief valve

Release chamber

Stop valve

Balancer

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

Conduction, convection and radiation

Convention only

Convection and radiation

Radiation only

24. 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

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

90°

120°

60°

30°

26. 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

27. 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

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

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

Act as a reservoir or stabilizer of electricity

29. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

30. 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

Page 4 of 4

31. The basic characteristics of a brake fluid is

Low viscosity

All of these

A high boiling point

Compatibility with rubber and metal parts

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

Brass

Cast iron

Ceramic

Aluminium

33. 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

34. The two kinds of piston rings are

Compression and sliding seal rings

Oil scrapper and oil control rings

Pressure and sealing rings

Compression and oil control rings

35. 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

Section height to section width

Wheel diameter to section width

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

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

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

Delivers improved cornering on dry road surfaces

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

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

Same

Higher

Depends on fuel quality

Lower

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

Right of the vehicle

Left of the vehicle

Rear of the vehicle

Front of the vehicle

39. The ignition coil is used to

Step up voltage

Step up current

Step down voltage

Step down current

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

300bar

200bar

250bar

220bar

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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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