Automobile Engineering Practice Set-4

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

Brass

Cast iron

Ceramic

Aluminium

2. In Spark Ignition Engine

(D) None of these Correct Answer

(C) Both (A) and (B)

(A) Only air is introduced into the cylinder

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

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

Feeds blow by gases to the exhaust manifold

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

4. The basic characteristics of a brake fluid is

Low viscosity

A high boiling point

All of these

Compatibility with rubber and metal parts

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

1-2-3-4

1-3-4-2

1-3-2-4

1-4-3-2

6. The two kinds of piston rings are

Compression and oil control rings

Oil scrapper and oil control rings

Pressure and sealing rings

Compression and sliding seal rings

7. The ignition coil is used to

Step up current

Step up voltage

Step down current

Step down voltage

8. The exhaust gas from petrol engine contains

Carbon monoxide

Petrol vapours

All of these

Water vapours

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

Flywheel

Torque converter

Differential

Clutch

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

SAE20 W50

API SF

SAE 30

API 50

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11. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

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

Allow the engine to warm up quickly

Prevent the coolant from boiling

Pressurise the system to raise the boiling point

Indicate the coolant temperature

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

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

Brake pedal, master cylinder, vacuum servo mechanism, brake lines, 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. Free pedal play in car clutches is about

60 mm

40 mm

25 mm

15 mm

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

Front of the vehicle

Rear of the vehicle

Right of the vehicle

Left of the vehicle

16. The piston compression rings are made of

Steel

Bronze

Cast iron

Aluminium

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

200bar

300bar

220bar

250bar

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

Less compression ratio gives better performance

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

Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

It makes petrol engines lighter

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

180°C to 360 °C

100°C to 120°C

70°C to 100°C

120°C to 180°C

20. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

Boost the force applied to brake pedal

Adjust the extent of brake pedal free play

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

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

It blows air through the radiator when necessary

It cools the engine by blowing air onto the cylinder block

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

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

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

Delivers improved cornering on dry road surfaces

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

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

23. The service brakes employed in cars are generally operated

Hydraulically

None of these

Pneumatically

Mechanically

24. 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

1669.4 N

16.694 N

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

Stop valve

Release chamber

Relief valve

Balancer

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

Detonation

Scavenging

Auto ignition

Supercharging

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

Convection and radiation

Radiation only

Convention only

Conduction, convection and radiation

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

Supply electricity to the vehicle's electrical system at all times while the engine is running

Act as a reservoir or stabilizer of electricity

Supply a large amount of power to turn the starter motor when the engine is being started

Supply electricity to the alternator

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

Wheel diameter to section height

Wheel diameter to section width

Section height to section width

Section width to section height

30. 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

Cleaning

Scavenging

Priming

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

Prevents rain water from entering the engine

Prevents dust and other foreign matter from entering the engine

Reduces the engine's air intake noise

Controls the engine's air intake volume

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

Contact areas of the tyres

Difference in the toe angles of the left and right wheels

Turning radius of the left and right wheels

Free plays of the steering wheel

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

Increases

Remains the same

None of these

Decreases

34. The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings

Reduce vibrations caused by the crankshaft rotation

Increase inertia force of the rotating crankshaft

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

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

Lower

Higher

Same

Depends on fuel quality

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

Boring

Shot peening

Honing

Porous plating

37. 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

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

6-10

15-20

10-15

25-40

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

9

900

9000

90

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

60°

120°

30°

90°

Automobile Engineering Practice Set-4

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