Automobile Engineering Practice Set-4

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

Contact areas of the tyres

Free plays of the steering wheel

Difference in the toe angles of the left and right wheels

Turning radius of the left and right wheels

2. The exhaust gas from petrol engine contains

Water vapours

Petrol vapours

All of these

Carbon monoxide

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

Honing

Boring

Shot peening

Porous plating

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 draws heat out of the engine compartment

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

5. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

6. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

Adjust the extent of brake pedal free play

Boost the force applied to brake pedal

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

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

Depends on fuel quality

Same

Higher

Lower

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

Indicate the coolant temperature

Allow the engine to warm up quickly

Prevent the coolant from boiling

Pressurise the system to raise the boiling point

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

Flywheel

Clutch

Torque converter

Differential

10. The piston compression rings are made of

Aluminium

Steel

Cast iron

Bronze

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

Brass

Aluminium

Ceramic

Cast iron

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

30°

120°

90°

60°

13. 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

14. 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

Increase inertia force of the rotating crankshaft

Adjusts the timing of the intake and exhaust valve openings

15. 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

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

API 50

SAE 30

SAE20 W50

API SF

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

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

Delivers improved cornering on dry road surfaces

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

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

Left of the vehicle

Right of the vehicle

Rear of the vehicle

Front of the vehicle

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

100°C to 120°C

70°C to 100°C

120°C to 180°C

180°C to 360 °C

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

1669.4 N

1.6694 N

166.94 N

16.694 N

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

Relief valve

Balancer

Release chamber

Stop valve

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

Planetary gear

Magnetic clutch

Synchronizer

Hydraulic multi plate clutch

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

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

Supply electricity to the alternator

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

900

9

9000

90

25. 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

Prevents dust and other foreign matter from entering the engine

Reduces the engine's air intake noise

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

Conduction, convection and radiation

Convection and radiation

Convention only

Radiation only

27. Free pedal play in car clutches is about

60 mm

40 mm

15 mm

25 mm

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

250bar

300bar

200bar

220bar

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

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

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

30. 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

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31. The two kinds of piston rings are

Compression and sliding seal rings

Compression and oil control rings

Pressure and sealing rings

Oil scrapper and oil control rings

32. The service brakes employed in cars are generally operated

Pneumatically

None of these

Hydraulically

Mechanically

33. The ignition coil is used to

Step up voltage

Step up current

Step down current

Step down voltage

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

25-40

6-10

15-20

10-15

35. 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

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

Less compression ratio gives better performance

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

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

None of these

Increases

Remains the same

Decreases

38. In Spark Ignition Engine

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

(D) None of these Correct Answer

(C) Both (A) and (B)

(A) Only air is introduced into the cylinder

39. The basic characteristics of a brake fluid is

Low viscosity

Compatibility with rubber and metal parts

All of these

A high boiling point

40. 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

Detonation

Auto ignition

Supercharging

Automobile Engineering Practice Set-4

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