Automobile Engineering Practice Set-4

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1. Free pedal play in car clutches is about

60 mm

40 mm

25 mm

15 mm

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

10-15

6-10

25-40

15-20

3. 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

Supercharging

Auto ignition

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

Differential

Clutch

Torque converter

Flywheel

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

Front of the vehicle

Rear of the vehicle

Left of the vehicle

Right of the vehicle

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

180°C to 360 °C

70°C to 100°C

100°C to 120°C

120°C to 180°C

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

Section width to section height

Section height to section width

Wheel diameter to section width

Wheel diameter to section height

8. 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

9. 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

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

Honing

Shot peening

Boring

Porous plating

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

Magnetic clutch

Synchronizer

Planetary gear

Hydraulic multi plate clutch

12. 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 cools the engine by blowing air onto the cylinder block

It draws heat out of the engine compartment

13. The basic characteristics of a brake fluid is

Compatibility with rubber and metal parts

A high boiling point

All of these

Low viscosity

14. The discharged lead acid battery has on its plates

Lead peroxide (PbO₂)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

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

90°

60°

30°

120°

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

Decreases

Remains the same

None of these

Increases

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

Lower

Higher

Depends on fuel quality

Same

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

90

9000

900

9

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

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

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

300bar

220bar

200bar

250bar

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

1.6694 N

1669.4 N

166.94 N

16.694 N

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

1-3-2-4

1-2-3-4

1-4-3-2

1-3-4-2

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

Allow the engine to warm up quickly

Indicate the coolant temperature

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

24. 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 makes petrol engines lighter

It is just customary to have less compression ratio in petrol engines

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 main function of a master cylinder is to

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

Adjust the extent of brake pedal free play

27. The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft

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

Reduce vibrations caused by the crankshaft rotation

Adjusts the timing of the intake and exhaust valve openings

28. The service brakes employed in cars are generally operated

None of these

Mechanically

Pneumatically

Hydraulically

29. The exhaust gas from petrol engine contains

Water vapours

All of these

Carbon monoxide

Petrol vapours

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

Act as a reservoir or stabilizer of electricity

Supply electricity to the alternator

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

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

Controls the engine's air intake volume

Prevents dust and other foreign matter from entering the engine

Prevents rain water from entering the engine

Reduces the engine's air intake noise

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

Brass

Ceramic

Aluminium

Cast iron

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

Free plays of the steering wheel

Turning radius of the left and right wheels

Difference in the toe angles of the left and right wheels

Contact areas of the tyres

34. The ignition coil is used to

Step down current

Step up voltage

Step down voltage

Step up current

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

API SF

SAE20 W50

API 50

SAE 30

36. In Spark Ignition Engine

(D) None of these Correct Answer

(C) Both (A) and (B)

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

(A) Only air is introduced into the cylinder

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

Radiation only

Convention only

Conduction, convection and radiation

Convection and radiation

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

Returns blow by gases from the crankcase to the intake system

Feeds blow by gases to the exhaust manifold

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

Mixes fuel with air

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

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

Delivers improved cornering on dry road surfaces

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

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

40. The piston compression rings are made of

Cast iron

Bronze

Aluminium

Steel

Automobile Engineering Practice Set-4

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