Automobile Engineering Practice Set-4

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1. 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

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

Synchronizer

Magnetic clutch

Planetary gear

Hydraulic multi plate clutch

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

90°

60°

30°

120°

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

SAE20 W50

SAE 30

API SF

API 50

5. The discharged lead acid battery has on its plates

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

Lead peroxide (PbO₂)

Spongy lead (Pb)

6. 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

7. 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

8. 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

9. 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

16.694 N

1669.4 N

10. Free pedal play in car clutches is about

25 mm

15 mm

60 mm

40 mm

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

Convention only

Convection and radiation

Conduction, convection and radiation

Radiation only

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

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

Indicate the coolant temperature

Prevent the coolant from boiling

13. In Spark Ignition Engine

(D) None of these Correct Answer

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

(C) Both (A) and (B)

(A) Only air is introduced into the cylinder

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

It draws heat out of the engine compartment

It cools the engine by blowing air onto the cylinder block

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

15. 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

Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

It is just customary to have less compression ratio in petrol engines

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

Boring

Shot peening

Porous plating

Honing

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

220bar

250bar

200bar

300bar

18. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

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

Boost the force applied to brake pedal

Adjust the extent of brake pedal free play

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

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

20. 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

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

Flywheel

Clutch

Torque converter

Differential

22. The basic characteristics of a brake fluid is

A high boiling point

All of these

Compatibility with rubber and metal parts

Low viscosity

23. The exhaust gas from petrol engine contains

Petrol vapours

Water vapours

Carbon monoxide

All of these

24. 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

25. The service brakes employed in cars are generally operated

Hydraulically

Pneumatically

None of these

Mechanically

26. The piston compression rings are made of

Cast iron

Aluminium

Steel

Bronze

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

Ensures that effective braking can be performed, even on slippery surfaces

Delivers improved cornering on dry road 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.

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

1-2-3-4

1-3-4-2

1-4-3-2

1-3-2-4

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

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

Supply electricity to the vehicle's electrical system at all times while the engine is running

Act as a reservoir or stabilizer of electricity

Supply electricity to the alternator

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

15-20

25-40

10-15

6-10

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31. 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

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

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

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

Returns blow by gases from the crankcase to the intake system

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

9000

90

9

900

34. The ignition coil is used to

Step down current

Step down voltage

Step up current

Step up voltage

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

Ceramic

Aluminium

Brass

Cast iron

36. 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

Detonation

Priming

Cleaning

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

Depends on fuel quality

Lower

Higher

Same

38. 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

Detonation

Supercharging

Scavenging

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

Decreases

None of these

Remains the same

Increases

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

Wheel diameter to section height

Section width to section height

Wheel diameter to section width

Section height to section width

Automobile Engineering Practice Set-4

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