Automobile Engineering Practice Set-4

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1. The basic characteristics of a brake fluid is

All of these

A high boiling point

Low viscosity

Compatibility with rubber and metal parts

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

1.6694 N

1669.4 N

16.694 N

166.94 N

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

Porous plating

Shot peening

Boring

Honing

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

SAE20 W50

API SF

API 50

SAE 30

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

None of these

Decreases

Increases

Remains the same

6. 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

7. The service brakes employed in cars are generally operated

Mechanically

None of these

Pneumatically

Hydraulically

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

Feeds blow by gases to the exhaust manifold

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

Mixes fuel with air

Returns blow by gases from the crankcase to the intake system

9. In Spark Ignition Engine

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

(A) Only air is introduced into the cylinder

(D) None of these Correct Answer

(C) Both (A) and (B)

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

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

It blows air through the radiator when necessary

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

Rear of the vehicle

Right of the vehicle

Front of the vehicle

Left of the vehicle

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

6-10

10-15

15-20

25-40

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

Prevents rain water from entering the engine

Reduces the engine's air intake noise

Controls the engine's air intake volume

Prevents dust and other foreign matter from entering the engine

14. The piston compression rings are made of

Cast iron

Bronze

Steel

Aluminium

15. 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

16. The ignition coil is used to

Step down current

Step up current

Step down voltage

Step up voltage

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

1-3-4-2

1-2-3-4

1-4-3-2

1-3-2-4

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

200bar

220bar

250bar

300bar

19. 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

Priming

Scavenging

Detonation

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

Same

Lower

Higher

Depends on fuel quality

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21. 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

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

It makes petrol engines lighter

Less compression ratio gives better performance

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

Synchronizer

Planetary gear

Hydraulic multi plate clutch

Magnetic clutch

23. 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 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

24. The two kinds of piston rings are

Oil scrapper and oil control rings

Compression and oil control rings

Pressure and sealing rings

Compression and sliding seal rings

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

Cast iron

Aluminium

Brass

Ceramic

26. The main function of a master cylinder is to

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

Convert brake pedal force into hydraulic pressure

27. The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings

Increase inertia force of the rotating crankshaft

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

Reduce vibrations caused by the crankshaft rotation

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

9000

9

90

900

29. 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

Scavenging

Supercharging

Auto ignition

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

120°C to 180°C

100°C to 120°C

70°C to 100°C

180°C to 360 °C

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

Release chamber

Relief valve

Balancer

Stop valve

32. 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

33. Free pedal play in car clutches is about

15 mm

60 mm

40 mm

25 mm

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

120°

60°

30°

90°

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

Torque converter

Clutch

Differential

Flywheel

36. The exhaust gas from petrol engine contains

Carbon monoxide

Petrol vapours

All of these

Water vapours

37. The discharged lead acid battery has on its plates

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

38. 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

Delivers improved cornering on dry road surfaces

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

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

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

Convection and radiation

Radiation only

Conduction, convection and radiation

Convention only

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

Indicate the coolant temperature

Allow the engine to warm up quickly

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

Automobile Engineering Practice Set-4

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