Automobile Engineering Practice Set-4

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

9

900

9000

90

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

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

It draws heat out of the engine compartment

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

SAE20 W50

API SF

API 50

SAE 30

4. 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

Section height to section width

Wheel diameter to section height

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

Front of the vehicle

Right of the vehicle

Rear of the vehicle

Left of the vehicle

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

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

Returns blow by gases from the crankcase to the intake system

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

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

Same

Higher

Lower

Depends on fuel quality

8. The basic characteristics of a brake fluid is

Low viscosity

A high boiling point

All of these

Compatibility with rubber and metal parts

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

Differential

Flywheel

Torque converter

Clutch

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

Radiation only

Conduction, convection and radiation

Convention only

Convection and radiation

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

1.6694 N

16.694 N

1669.4 N

166.94 N

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

220bar

250bar

300bar

200bar

14. 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

Free plays of the steering wheel

Turning radius of the left and right wheels

15. 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

Auto ignition

Supercharging

Scavenging

Detonation

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

Brass

Ceramic

Cast iron

Aluminium

17. The service brakes employed in cars are generally operated

Hydraulically

Pneumatically

None of these

Mechanically

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

70°C to 100°C

100°C to 120°C

180°C to 360 °C

120°C to 180°C

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

Release chamber

Stop valve

Relief valve

Balancer

20. 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

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

90°

120°

60°

30°

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

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

Delivers improved cornering on dry road surfaces

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

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

Allow the engine to warm up quickly

Indicate the coolant temperature

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

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

Supply electricity to the alternator

Act as a reservoir or stabilizer of electricity

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

1-4-3-2

1-3-2-4

1-3-4-2

1-2-3-4

26. The two kinds of piston rings are

Oil scrapper and oil control rings

Compression and oil control rings

Pressure and sealing rings

Compression and sliding seal rings

27. The exhaust gas from petrol engine contains

Carbon monoxide

Water vapours

All of these

Petrol vapours

28. 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

Detonation

Scavenging

Cleaning

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

Magnetic clutch

Planetary gear

Synchronizer

Hydraulic multi plate clutch

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

None of these

Decreases

Remains the same

Increases

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31. The ignition coil is used to

Step up voltage

Step up current

Step down current

Step down voltage

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

Shot peening

Porous plating

Boring

Honing

33. The discharged lead acid battery has on its plates

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

34. 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

35. The piston compression rings are made of

Steel

Cast iron

Bronze

Aluminium

36. In Spark Ignition Engine

(A) Only air is introduced into the cylinder

(D) None of these Correct Answer

(C) Both (A) and (B)

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

37. Free pedal play in car clutches is about

60 mm

15 mm

25 mm

40 mm

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

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

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

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

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

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

25-40

6-10

15-20

10-15

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

Prevents rain water from entering the engine

Controls the engine's air intake volume

Reduces the engine's air intake noise

Prevents dust and other foreign matter from entering the engine

Automobile Engineering Practice Set-4

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