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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 service brakes employed in cars are generally operated

Mechanically

None of these

Pneumatically

Hydraulically

2. The exhaust gas from petrol engine contains

All of these

Carbon monoxide

Water vapours

Petrol vapours

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

Mixes fuel with air

Returns blow by gases from the crankcase to the intake system

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

Feeds blow by gases to the exhaust manifold

4. 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

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

Boring

Porous plating

Shot peening

Honing

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

Scavenging

Auto ignition

Detonation

Supercharging

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

API SF

SAE20 W50

API 50

SAE 30

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

Wheel diameter to section height

Section height to section width

Wheel diameter to section width

Section width to section height

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

10-15

15-20

25-40

6-10

10. The ignition coil is used to

Step up voltage

Step down voltage

Step down current

Step up current

Page 2 of 4

11. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

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

1-4-3-2

1-3-4-2

1-3-2-4

1-2-3-4

13. The piston compression rings are made of

Cast iron

Bronze

Steel

Aluminium

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

166.94 N

1.6694 N

16.694 N

1669.4 N

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

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

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

16. 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

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

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

It makes petrol engines lighter

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

Rear of the vehicle

Left of the vehicle

Right of the vehicle

Front of the vehicle

19. 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

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

90

9

9000

900

Page 3 of 4

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

Synchronizer

Planetary gear

Magnetic clutch

Hydraulic multi plate clutch

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

Balancer

Stop valve

Release chamber

Relief valve

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

Depends on fuel quality

Lower

Higher

Same

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 function of a master cylinder is to

Boost the force applied to brake pedal

Adjust the extent of brake pedal free play

Convert brake pedal force into hydraulic pressure

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

26. In Spark Ignition Engine

(D) None of these Correct Answer

(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

27. 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

Cleaning

Detonation

Scavenging

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

300bar

200bar

250bar

220bar

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

Flywheel

Differential

Clutch

Torque converter

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

120°C to 180°C

180°C to 360 °C

70°C to 100°C

100°C to 120°C

Page 4 of 4

31. 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

32. The basic characteristics of a brake fluid is

Low viscosity

Compatibility with rubber and metal parts

All of these

A high boiling point

33. Free pedal play in car clutches is about

40 mm

25 mm

15 mm

60 mm

34. 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

Free plays of the steering wheel

Turning radius of the left and right wheels

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

120°

30°

60°

90°

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

Brass

Aluminium

Cast iron

Ceramic

37. The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft

Reduce vibrations caused by the crankshaft rotation

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

Adjusts the timing of the intake and exhaust valve openings

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

Controls the engine's air intake volume

Prevents rain water from entering the engine

Reduces the engine's air intake noise

Prevents dust and other foreign matter from entering the engine

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

It blows air through the radiator when necessary

It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump

It draws heat out of the engine compartment

It cools the engine by blowing air onto the cylinder block

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

Remains the same

None of these

Decreases

Increases

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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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