Automobile Engineering Practice Set-4

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1. 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

2. 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

3. 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

4. The exhaust gas from petrol engine contains

Water vapours

All of these

Petrol vapours

Carbon monoxide

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

1-3-4-2

1-4-3-2

1-2-3-4

1-3-2-4

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

180°C to 360 °C

100°C to 120°C

120°C to 180°C

70°C to 100°C

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

6-10

15-20

10-15

25-40

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

Conduction, convection and radiation

Convection and radiation

Convention only

Radiation only

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

Ceramic

Aluminium

Cast iron

Brass

10. The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft

Reduce vibrations caused by the crankshaft rotation

Adjusts the timing of the intake and exhaust valve openings

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

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11. The discharged lead acid battery has on its plates

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

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

Boring

Honing

Porous plating

Shot peening

13. The two kinds of piston rings are

Compression and oil control rings

Compression and sliding seal rings

Oil scrapper and oil control rings

Pressure and sealing rings

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

SAE20 W50

API 50

API SF

SAE 30

15. The basic characteristics of a brake fluid is

A high boiling point

Compatibility with rubber and metal parts

All of these

Low viscosity

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

Auto ignition

Supercharging

Scavenging

Detonation

17. 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 draws heat out of the engine compartment

It cools the engine by blowing air onto the cylinder block

18. The service brakes employed in cars are generally operated

Hydraulically

Mechanically

Pneumatically

None of these

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

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

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

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

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.

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

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

Section width to section height

Wheel diameter to section height

Section height to section width

Wheel diameter to section width

22. 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

Cleaning

Scavenging

Detonation

Priming

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

None of these

Remains the same

Increases

Decreases

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

Clutch

Flywheel

Differential

Torque converter

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

Left of the vehicle

Rear of the vehicle

Right of the vehicle

Front of the vehicle

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

Pressurise the system to raise the boiling point

Indicate the coolant temperature

Prevent the coolant from boiling

Allow the engine to warm up quickly

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

9000

9

90

900

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

Turning radius of the left and right wheels

Contact areas of the tyres

Difference in the toe angles of the left and right wheels

Free plays of the steering wheel

29. Free pedal play in car clutches is about

40 mm

60 mm

15 mm

25 mm

30. The ignition coil is used to

Step up current

Step down voltage

Step up voltage

Step down current

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

90°

120°

60°

30°

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

Supply electricity to the alternator

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

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

220bar

250bar

200bar

300bar

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

It makes petrol engines lighter

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

Less compression ratio gives better performance

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

35. The main function of a master cylinder is to

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

Convert brake pedal force into hydraulic pressure

Boost the force applied to brake pedal

Adjust the extent of brake pedal free play

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

Returns blow by gases from the crankcase to the intake system

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

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

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

Stop valve

Relief valve

Balancer

Release chamber

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

Lower

Same

Higher

Depends on fuel quality

39. The piston compression rings are made of

Bronze

Cast iron

Aluminium

Steel

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

Hydraulic multi plate clutch

Synchronizer

Planetary gear

Magnetic clutch

Automobile Engineering Practice Set-4

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