Automobile Engineering Practice Set-4

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

Aluminium

Brass

Ceramic

Cast iron

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

Flywheel

Differential

Clutch

Torque converter

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

1-3-4-2

1-4-3-2

1-2-3-4

1-3-2-4

4. 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

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

Same

Lower

Higher

Depends on fuel quality

6. The basic characteristics of a brake fluid is

Compatibility with rubber and metal parts

A high boiling point

Low viscosity

All of these

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

Mixes fuel with air

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

Feeds blow by gases to the exhaust manifold

Returns blow by gases from the crankcase to the intake system

8. In Spark Ignition Engine

(A) Only air is introduced into the cylinder

(C) Both (A) and (B)

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

(D) None of these Correct Answer

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

SAE20 W50

API SF

API 50

SAE 30

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

15-20

10-15

25-40

6-10

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11. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

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

Adjust the extent of brake pedal free play

Boost the force applied to brake pedal

12. The discharged lead acid battery has on its plates

Spongy lead (Pb)

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

13. The purpose of a balancer shaft is to

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

Increase inertia force of the rotating crankshaft

14. 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

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

15. The ignition coil is used to

Step up voltage

Step down voltage

Step up current

Step down current

16. 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

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

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

Indicate the coolant temperature

Allow the engine to warm up quickly

18. 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

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

90

9000

9

900

20. The two kinds of piston rings are

Pressure and sealing rings

Compression and oil control rings

Oil scrapper and oil control rings

Compression and sliding seal rings

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21. The piston compression rings are made of

Bronze

Aluminium

Cast iron

Steel

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

120°

30°

60°

90°

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

None of these

Remains the same

Increases

Decreases

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

1.6694 N

166.94 N

1669.4 N

16.694 N

25. The service brakes employed in cars are generally operated

None of these

Mechanically

Pneumatically

Hydraulically

26. 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

Supply electricity to the alternator

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

27. 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

28. The exhaust gas from petrol engine contains

Carbon monoxide

Petrol vapours

All of these

Water vapours

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

Shot peening

Porous plating

Honing

Boring

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

Convention only

Convection and radiation

Radiation only

Conduction, convection and radiation

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

200bar

250bar

300bar

220bar

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

Free plays of the steering wheel

Contact areas of the tyres

Difference in the toe angles of the left and right wheels

Turning radius of the left and right wheels

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

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

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

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

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

35. 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

36. Free pedal play in car clutches is about

40 mm

60 mm

25 mm

15 mm

37. 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

Scavenging

Cleaning

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

Wheel diameter to section width

Section width to section height

Wheel diameter to section height

Section height to section width

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

Rear of the vehicle

Left of the vehicle

Front of the vehicle

Right of the vehicle

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

It draws heat out of the engine compartment

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

Automobile Engineering Practice Set-4

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