Automobile Engineering Practice Set-4

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

Increases

Decreases

None of these

Remains the same

2. The exhaust gas from petrol engine contains

Petrol vapours

Carbon monoxide

All of these

Water vapours

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

Feeds blow by gases to the exhaust manifold

Mixes fuel with air

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

Returns blow by gases from the crankcase to the intake system

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

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

It blows air through the radiator when necessary

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

Convention only

Conduction, convection and radiation

Radiation only

Convection and radiation

6. 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

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

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

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

8. 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

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

Torque converter

Flywheel

Clutch

Differential

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

900

9000

90

9

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11. The ignition coil is used to

Step up current

Step up voltage

Step down current

Step down voltage

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

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

Supply electricity to the alternator

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

Brass

Ceramic

Aluminium

Cast iron

14. 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

15. The basic characteristics of a brake fluid is

Compatibility with rubber and metal parts

Low viscosity

A high boiling point

All of these

16. 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

Supercharging

Auto ignition

Detonation

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

Difference in the toe angles of the left and right wheels

Free plays of the steering wheel

Contact areas of the tyres

Turning radius of the left and right wheels

18. 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.

Delivers improved cornering on dry road surfaces

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

19. The main function of a master cylinder is to

Boost the force applied to brake pedal

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

20. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

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21. The service brakes employed in cars are generally operated

Hydraulically

None of these

Mechanically

Pneumatically

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

1-4-3-2

1-3-4-2

1-3-2-4

1-2-3-4

23. 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

166.94 N

1669.4 N

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

Relief valve

Release chamber

Balancer

Stop valve

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

API SF

API 50

SAE20 W50

SAE 30

26. 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

Cleaning

Detonation

Scavenging

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

Honing

Porous plating

Boring

Shot peening

28. The piston compression rings are made of

Aluminium

Bronze

Steel

Cast iron

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

15-20

25-40

6-10

10-15

30. 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

Adjusts the timing of the intake and exhaust valve openings

Reduce vibrations caused by the crankshaft rotation

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

120°C to 180°C

70°C to 100°C

180°C to 360 °C

100°C to 120°C

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

90°

120°

30°

60°

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

Lower

Same

Depends on fuel quality

Higher

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

220bar

250bar

300bar

200bar

35. Free pedal play in car clutches is about

25 mm

40 mm

60 mm

15 mm

36. 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

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

Less compression ratio gives better performance

It makes petrol engines lighter

37. 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 height

Wheel diameter to section width

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

Prevents dust and other foreign matter from entering the engine

Prevents rain water from entering the engine

Controls the engine's air intake volume

Reduces the engine's air intake noise

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

Prevent the coolant from boiling

Indicate the coolant temperature

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

40. 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

Automobile Engineering Practice Set-4

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