Automobile Engineering Practice Set-4

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

Increases

Remains the same

Decreases

None of these

2. Free pedal play in car clutches is about

15 mm

60 mm

40 mm

25 mm

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

Supply electricity to the alternator

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

Act as a reservoir or stabilizer of electricity

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

Lower

Higher

Same

Depends on fuel quality

5. The ignition coil is used to

Step up voltage

Step up current

Step down current

Step down voltage

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

15-20

25-40

6-10

10-15

7. 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

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

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

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

60°

90°

120°

30°

10. The exhaust gas from petrol engine contains

Petrol vapours

Water vapours

All of these

Carbon monoxide

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11. 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 blows air through the radiator when necessary

It draws heat out of the engine compartment

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

API SF

SAE20 W50

SAE 30

API 50

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

Torque converter

Clutch

Flywheel

Differential

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

Convection and radiation

Convention only

Radiation only

Conduction, convection and radiation

15. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

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

Honing

Boring

Porous plating

Shot peening

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

Rear of the vehicle

Right of the vehicle

Left of the vehicle

Front of the vehicle

18. The piston compression rings are made of

Bronze

Cast iron

Steel

Aluminium

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

Section width to section height

Wheel diameter to section height

Section height to section width

Wheel diameter to section width

20. 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

Cleaning

Priming

Scavenging

Detonation

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

Synchronizer

Hydraulic multi plate clutch

Magnetic clutch

Planetary gear

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

Prevent the coolant from boiling

Pressurise the system to raise the boiling point

Indicate the coolant temperature

Allow the engine to warm up quickly

23. 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

24. The two kinds of piston rings are

Compression and oil control rings

Oil scrapper and oil control rings

Compression and sliding seal rings

Pressure and sealing rings

25. The main function of a master cylinder is to

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

Adjust the extent of brake pedal free play

Convert brake pedal force into hydraulic pressure

Boost the force applied to brake pedal

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

9

90

9000

900

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

Controls the engine's air intake volume

Prevents rain water from entering the engine

Reduces the engine's air intake noise

Prevents dust and other foreign matter from entering the engine

28. 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

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

Turning radius of the left and right wheels

Free plays of the steering wheel

Difference in the toe angles of the left and right wheels

Contact areas of the tyres

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

Ensures that effective braking can be performed, even on slippery 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

Delivers improved cornering on dry road surfaces

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

It makes petrol engines lighter

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

32. 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

Supercharging

Auto ignition

Scavenging

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

Aluminium

Ceramic

Cast iron

Brass

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

250bar

200bar

300bar

220bar

35. The basic characteristics of a brake fluid is

Low viscosity

All of these

A high boiling point

Compatibility with rubber and metal parts

36. The purpose of a balancer shaft is to

Reduce vibrations caused by the crankshaft rotation

Increase inertia force of the rotating crankshaft

Adjusts the timing of the intake and exhaust valve openings

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

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

Release chamber

Stop valve

Balancer

Relief valve

38. The service brakes employed in cars are generally operated

Mechanically

Hydraulically

Pneumatically

None of these

39. 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

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

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

Mixes fuel with air

Returns blow by gases from the crankcase to the intake system

Feeds blow by gases to the exhaust manifold

Automobile Engineering Practice Set-4

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