Automobile Engineering Practice Set-4

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

Depends on fuel quality

Higher

Lower

Same

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

9

900

90

9000

3. The purpose of a balancer shaft is to

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

Increase inertia force of the rotating crankshaft

Reduce vibrations caused by the crankshaft rotation

Adjusts the timing of the intake and exhaust valve openings

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

Stop valve

Balancer

Release chamber

Relief valve

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

Magnetic clutch

Synchronizer

Hydraulic multi plate clutch

Planetary gear

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

10-15

15-20

6-10

25-40

7. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

8. 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

Scavenging

Cleaning

Priming

Detonation

9. The two kinds of piston rings are

Compression and sliding seal rings

Pressure and sealing rings

Oil scrapper and oil control rings

Compression and oil control rings

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

Wheel diameter to section height

Wheel diameter to section width

Section height to section width

Section width to section height

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11. 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

Act as a reservoir or stabilizer of electricity

Supply electricity to the alternator

12. The basic characteristics of a brake fluid is

Compatibility with rubber and metal parts

A high boiling point

Low viscosity

All of these

13. 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

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

Differential

Clutch

Torque converter

Flywheel

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

120°

90°

30°

60°

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

250bar

200bar

300bar

220bar

17. The service brakes employed in cars are generally operated

Hydraulically

Pneumatically

None of these

Mechanically

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

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

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

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

100°C to 120°C

180°C to 360 °C

70°C to 100°C

120°C to 180°C

20. 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

Scavenging

Detonation

Supercharging

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21. The exhaust gas from petrol engine contains

Water vapours

Carbon monoxide

All of these

Petrol vapours

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

Increases

Remains the same

None of these

Decreases

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

Reduces the engine's air intake noise

Prevents rain water from entering the engine

Controls the engine's air intake volume

Prevents dust and other foreign matter from entering the engine

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

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

Returns blow by gases from the crankcase to the intake system

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

25. The main function of a master cylinder is to

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

Convert brake pedal force into hydraulic pressure

26. Free pedal play in car clutches is about

15 mm

25 mm

40 mm

60 mm

27. The ignition coil is used to

Step down current

Step up current

Step up voltage

Step down voltage

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

It blows air through the radiator when necessary

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

29. The piston compression rings are made of

Bronze

Steel

Cast iron

Aluminium

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

Front of the vehicle

Left of the vehicle

Rear of the vehicle

Right of the vehicle

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31. In Spark Ignition Engine

(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)

(D) None of these Correct Answer

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

Allow the engine to warm up quickly

Prevent the coolant from boiling

Pressurise the system to raise the boiling point

Indicate the coolant temperature

33. 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

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

1-4-3-2

1-2-3-4

1-3-2-4

1-3-4-2

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

166.94 N

1.6694 N

1669.4 N

16.694 N

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

Porous plating

Shot peening

Honing

Boring

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

SAE20 W50

SAE 30

API 50

API SF

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

Aluminium

Cast iron

Ceramic

Brass

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

Difference in the toe angles of the left and right wheels

Contact areas of the tyres

Turning radius of the left and right wheels

Free plays of the steering wheel

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

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

It makes petrol engines lighter

Automobile Engineering Practice Set-4

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