Automobile Engineering Practice Set-4

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

1-3-2-4

1-4-3-2

1-3-4-2

1-2-3-4

2. Free pedal play in car clutches is about

15 mm

25 mm

40 mm

60 mm

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

Shot peening

Honing

Porous plating

Boring

4. 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 alternator

Act as a reservoir or stabilizer of electricity

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

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

Allow the engine to warm up quickly

Indicate the coolant temperature

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

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

Flywheel

Torque converter

Clutch

Differential

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

180°C to 360 °C

120°C to 180°C

70°C to 100°C

100°C to 120°C

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

Radiation only

Convention only

9. 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

Supercharging

Scavenging

Detonation

Auto ignition

10. The basic characteristics of a brake fluid is

All of these

A high boiling point

Low viscosity

Compatibility with rubber and metal parts

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

Release chamber

Balancer

Stop valve

Relief valve

12. The service brakes employed in cars are generally operated

Pneumatically

Hydraulically

Mechanically

None of these

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

API 50

SAE20 W50

SAE 30

API SF

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

Difference in the toe angles of the left and right wheels

Free plays of the steering wheel

Turning radius of the left and right wheels

Contact areas of the tyres

15. 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 makes petrol engines lighter

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

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

Magnetic clutch

Synchronizer

Planetary gear

Hydraulic multi plate clutch

17. The exhaust gas from petrol engine contains

Carbon monoxide

Petrol vapours

All of these

Water vapours

18. The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft

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

Adjusts the timing of the intake and exhaust valve openings

Reduce vibrations caused by the crankshaft rotation

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

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

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

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

1669.4 N

166.94 N

16.694 N

1.6694 N

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

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

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

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

Priming

Scavenging

Cleaning

Detonation

23. The discharged lead acid battery has on its plates

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

24. The ignition coil is used to

Step up current

Step down voltage

Step up voltage

Step down current

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

It blows air through the radiator when necessary

It draws heat out of the engine compartment

It cools the engine by blowing air onto the cylinder block

It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump

26. The piston compression rings are made of

Steel

Aluminium

Bronze

Cast iron

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

90°

60°

120°

30°

28. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

Adjust the extent of brake pedal free play

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

Boost the force applied to brake pedal

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

25-40

10-15

15-20

6-10

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

Cast iron

Ceramic

Brass

Aluminium

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

900

90

9000

9

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

250bar

200bar

220bar

300bar

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

Front of the vehicle

Right of the vehicle

Left of the vehicle

Rear of the vehicle

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

Returns blow by gases from the crankcase to the intake system

Feeds blow by gases to the exhaust manifold

Mixes fuel with air

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

35. 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

36. In Spark Ignition Engine

(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

(D) None of these Correct Answer

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

Higher

Same

Lower

Depends on fuel quality

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

Prevents dust and other foreign matter from entering the engine

Reduces the engine's air intake noise

Prevents rain water from entering the engine

Controls the engine's air intake volume

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

Remains the same

Increases

None of these

Decreases

40. The two kinds of piston rings are

Compression and oil control rings

Oil scrapper and oil control rings

Compression and sliding seal rings

Pressure and sealing rings

Automobile Engineering Practice Set-4

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