Automobile Engineering Practice Set-4

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1. 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

2. 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 blows air through the radiator when necessary

It cools the engine by blowing air onto the cylinder block

It draws heat out of the engine compartment

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

Aluminium

Ceramic

Cast iron

Brass

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

30°

90°

120°

60°

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

166.94 N

1669.4 N

1.6694 N

16.694 N

6. The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings

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

7. The exhaust gas from petrol engine contains

Water vapours

Carbon monoxide

All of these

Petrol vapours

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

Hydraulic multi plate clutch

Magnetic clutch

Planetary gear

Synchronizer

9. 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

Detonation

Cleaning

Priming

10. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

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

Relief valve

Balancer

Stop valve

Release chamber

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

API 50

SAE20 W50

SAE 30

API SF

13. In Spark Ignition Engine

(A) Only air is introduced into the cylinder

(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

14. 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

Detonation

Auto ignition

Supercharging

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

1-4-3-2

1-3-2-4

1-3-4-2

1-2-3-4

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

120°C to 180°C

70°C to 100°C

100°C to 120°C

180°C to 360 °C

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

Honing

Shot peening

Porous plating

Boring

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

Turning radius of the left and right wheels

Difference in the toe angles of the left and right wheels

Free plays of the steering wheel

Contact areas of the tyres

19. The ignition coil is used to

Step up current

Step up voltage

Step down voltage

Step down current

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

Indicate the coolant temperature

Prevent the coolant from boiling

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

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

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

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

22. 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

Feeds blow by gases to the exhaust manifold

Mixes fuel with air

23. 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

24. 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

25. Free pedal play in car clutches is about

25 mm

60 mm

40 mm

15 mm

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

Front of the vehicle

Right of the vehicle

Rear of the vehicle

Left of the vehicle

27. The two kinds of piston rings are

Pressure and sealing rings

Compression and oil control rings

Compression and sliding seal rings

Oil scrapper and oil control rings

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

Same

Lower

Depends on fuel quality

Higher

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

Decreases

Remains the same

None of these

Increases

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

300bar

250bar

220bar

200bar

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31. The basic characteristics of a brake fluid is

Low viscosity

Compatibility with rubber and metal parts

A high boiling point

All of these

32. The piston compression rings are made of

Aluminium

Steel

Cast iron

Bronze

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

Flywheel

Clutch

Torque converter

Differential

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

900

90

9

9000

35. The service brakes employed in cars are generally operated

Mechanically

Hydraulically

None of these

Pneumatically

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

10-15

25-40

6-10

15-20

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

Delivers improved cornering on dry road surfaces

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

38. The main function of a master cylinder is to

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

Convert brake pedal force into hydraulic pressure

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

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

Act as a reservoir or stabilizer of electricity

40. 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 dust and other foreign matter from entering the engine

Prevents rain water from entering the engine

Automobile Engineering Practice Set-4

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