Automobile Engineering Practice Set-4

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

Higher

Lower

Depends on fuel quality

Same

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

Prevents dust and other foreign matter from entering the engine

Reduces the engine's air intake noise

Controls the engine's air intake volume

Prevents rain water from entering the engine

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

220bar

250bar

200bar

300bar

4. 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

Detonation

Priming

Cleaning

Scavenging

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

90

9

9000

900

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

15-20

6-10

25-40

10-15

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

Flywheel

Torque converter

Differential

Clutch

8. The piston compression rings are made of

Cast iron

Aluminium

Bronze

Steel

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

90°

30°

120°

60°

10. 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

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11. 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

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

Section height to section width

Section width to section height

Wheel diameter to section height

Wheel diameter to section width

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

70°C to 100°C

180°C to 360 °C

100°C to 120°C

120°C to 180°C

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

16.694 N

1.6694 N

1669.4 N

166.94 N

15. The basic characteristics of a brake fluid is

Compatibility with rubber and metal parts

A high boiling point

Low viscosity

All of these

16. 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

17. The service brakes employed in cars are generally operated

Mechanically

None of these

Hydraulically

Pneumatically

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

Contact areas of the tyres

Free plays of the steering wheel

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

Brass

Cast iron

Aluminium

Ceramic

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

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

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

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

Prevent the coolant from boiling

Indicate the coolant temperature

Pressurise the system to raise the boiling point

Allow the engine to warm up quickly

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

Increases

Remains the same

Decreases

None of these

23. 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 draws heat out of the engine compartment

It cools the engine by blowing air onto the cylinder block

It blows air through the radiator when necessary

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

1-3-4-2

1-3-2-4

1-4-3-2

1-2-3-4

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

Relief valve

Stop valve

Balancer

Release chamber

26. 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

Supercharging

Detonation

27. The main function of a master cylinder is to

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

Adjust the extent of brake pedal free play

28. The purpose of a balancer shaft is to

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

Adjusts the timing of the intake and exhaust valve openings

Reduce vibrations caused by the crankshaft rotation

Increase inertia force of the rotating crankshaft

29. The exhaust gas from petrol engine contains

Petrol vapours

All of these

Carbon monoxide

Water vapours

30. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

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

Planetary gear

Hydraulic multi plate clutch

Synchronizer

Magnetic clutch

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

Porous plating

Honing

Shot peening

Boring

33. In Spark Ignition Engine

(C) Both (A) and (B)

(A) Only air is introduced into the cylinder

(D) None of these Correct Answer

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

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

Feeds blow by gases to the exhaust manifold

Returns blow by gases from the crankcase to the intake system

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

Mixes fuel with air

35. 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

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

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

Delivers improved cornering on dry road surfaces

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

API SF

SAE 30

SAE20 W50

API 50

37. Free pedal play in car clutches is about

40 mm

15 mm

60 mm

25 mm

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

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

39. The ignition coil is used to

Step up current

Step down current

Step up voltage

Step down voltage

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

Supply electricity to the alternator

Act as a reservoir or stabilizer of electricity

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

Automobile Engineering Practice Set-4

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