Automobile Engineering Practice Set-4

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1. 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

166.94 N

1.6694 N

2. The ignition coil is used to

Step down current

Step up voltage

Step up current

Step down voltage

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

Prevent the coolant from boiling

Indicate the coolant temperature

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

4. 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

Adjusts the timing of the intake and exhaust valve openings

Increase inertia force of the rotating crankshaft

5. 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

Act as a reservoir or stabilizer of electricity

Supply electricity to the alternator

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

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

Magnetic clutch

Planetary gear

Hydraulic multi plate clutch

Synchronizer

7. The exhaust gas from petrol engine contains

All of these

Water vapours

Petrol vapours

Carbon monoxide

8. 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

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

70°C to 100°C

120°C to 180°C

100°C to 120°C

180°C to 360 °C

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

Front of the vehicle

Rear of the vehicle

Right of the vehicle

Left of the vehicle

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11. The basic characteristics of a brake fluid is

Low viscosity

All of these

A high boiling point

Compatibility with rubber and metal parts

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

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

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

Delivers improved cornering on dry road surfaces

13. 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, 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

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

Radiation only

Conduction, convection and radiation

Convection and radiation

Convention only

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

Detonation

Auto ignition

Supercharging

Scavenging

16. 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

Detonation

Priming

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

Decreases

None of these

Increases

Remains the same

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

Boring

Shot peening

Porous plating

Honing

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

25-40

15-20

6-10

10-15

20. Free pedal play in car clutches is about

15 mm

25 mm

60 mm

40 mm

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

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

Mixes fuel with air

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

Clutch

Flywheel

Differential

Torque converter

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

Section height to section width

Wheel diameter to section height

Wheel diameter to section width

Section width to section height

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

1-3-2-4

1-3-4-2

1-4-3-2

1-2-3-4

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

90°

30°

60°

120°

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

Cast iron

Aluminium

Brass

Ceramic

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

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

Less compression ratio gives better performance

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

It makes petrol engines lighter

28. The piston compression rings are made of

Steel

Bronze

Aluminium

Cast iron

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

SAE 30

SAE20 W50

API SF

API 50

30. The service brakes employed in cars are generally operated

Pneumatically

None of these

Mechanically

Hydraulically

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31. In Spark Ignition Engine

(C) Both (A) and (B)

(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

32. 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

Adjust the extent of brake pedal free play

Boost the force applied to brake pedal

33. The two kinds of piston rings are

Pressure and sealing rings

Compression and oil control rings

Oil scrapper and oil control rings

Compression and sliding seal rings

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

200bar

220bar

300bar

250bar

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

Free plays of the steering wheel

Contact areas of the tyres

Turning radius of the left and right wheels

Difference in the toe angles of the left and right wheels

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

Balancer

Relief valve

Stop valve

Release chamber

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

Higher

Lower

Depends on fuel quality

Same

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

90

900

9000

9

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

Prevents rain water from entering the engine

Prevents dust and other foreign matter from entering the engine

Controls the engine's air intake volume

Reduces the engine's air intake noise

40. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Automobile Engineering Practice Set-4

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