Automobile Engineering Practice Set-4

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

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

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

70°C to 100°C

180°C to 360 °C

120°C to 180°C

100°C to 120°C

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

9

900

90

9000

4. 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

5. 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

6. The exhaust gas from petrol engine contains

Water vapours

Carbon monoxide

Petrol vapours

All of these

7. The ignition coil is used to

Step down current

Step up voltage

Step down voltage

Step up current

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

Clutch

Differential

Flywheel

Torque converter

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

Boring

Porous plating

Honing

Shot peening

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

200bar

300bar

250bar

220bar

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11. 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

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

Contact areas of the tyres

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

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

SAE 30

API SF

API 50

SAE20 W50

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

25-40

15-20

10-15

6-10

15. The main function of a master cylinder is to

Adjust the extent of brake pedal free play

Convert brake pedal force into hydraulic pressure

Boost the force applied to brake pedal

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

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

Supercharging

Scavenging

Auto ignition

Detonation

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

Prevent the coolant from boiling

Allow the engine to warm up quickly

Indicate the coolant temperature

Pressurise the system to raise the boiling point

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

Conduction, convection and radiation

Convection and radiation

Radiation only

Convention only

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

120°

90°

60°

30°

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

Lower

Same

Higher

Depends on fuel quality

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21. The discharged lead acid battery has on its plates

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

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

Supply electricity to the alternator

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

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

Section width to section height

Wheel diameter to section width

Wheel diameter to section height

Section height to section width

24. 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

25. The piston compression rings are made of

Bronze

Steel

Aluminium

Cast iron

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

Cast iron

Aluminium

Brass

Ceramic

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

16.694 N

1669.4 N

1.6694 N

166.94 N

28. The service brakes employed in cars are generally operated

Mechanically

None of these

Hydraulically

Pneumatically

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

Increases

None of these

Remains the same

Decreases

30. 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

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31. 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

32. The basic characteristics of a brake fluid is

A high boiling point

Compatibility with rubber and metal parts

All of these

Low viscosity

33. 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

34. In Spark Ignition Engine

(D) None of these Correct Answer

(A) Only air is introduced into the cylinder

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

(C) Both (A) and (B)

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

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

It cools the engine by blowing air onto the cylinder block

36. Free pedal play in car clutches is about

25 mm

60 mm

40 mm

15 mm

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

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

Feeds blow by gases to the exhaust manifold

Mixes fuel with air

Returns blow by gases from the crankcase to the intake system

38. 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

39. 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

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

Delivers improved cornering on dry road surfaces

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

Front of the vehicle

Rear of the vehicle

Left of the vehicle

Right of the vehicle

Automobile Engineering Practice Set-4

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