Automobile Engineering Practice Set-4

Page 1 of 4

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

200bar

220bar

300bar

250bar

2. The main function of a master cylinder is to

Boost the force applied to brake pedal

Adjust the extent of brake pedal free play

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

Convert brake pedal force into hydraulic pressure

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

900

9000

90

9

4. The service brakes employed in cars are generally operated

Pneumatically

Hydraulically

Mechanically

None of these

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

15-20

25-40

10-15

6-10

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

Increases

Remains the same

None of these

Decreases

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

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

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

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

Front of the vehicle

Left of the vehicle

Rear of the vehicle

Right of the vehicle

9. Free pedal play in car clutches is about

25 mm

40 mm

60 mm

15 mm

10. 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

Detonation

Scavenging

Page 2 of 4

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

120°

90°

60°

30°

12. The basic characteristics of a brake fluid is

Compatibility with rubber and metal parts

All of these

Low viscosity

A high boiling point

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

Ceramic

Brass

Aluminium

Cast iron

14. 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

Section height to section width

Wheel diameter to section width

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

Scavenging

Auto ignition

Supercharging

Detonation

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

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

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

Delivers improved cornering on dry road surfaces

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

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

Feeds blow by gases to the exhaust manifold

18. The discharged lead acid battery has on its plates

Lead peroxide (PbO₂)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

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

Radiation only

Conduction, convection and radiation

Convention only

Convection and radiation

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

100°C to 120°C

120°C to 180°C

180°C to 360 °C

70°C to 100°C

Page 3 of 4

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

Porous plating

Honing

Shot peening

Boring

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

Relief valve

Stop valve

Balancer

Release chamber

23. The two kinds of piston rings are

Pressure and sealing rings

Compression and oil control rings

Compression and sliding seal rings

Oil scrapper and oil control rings

24. In Spark Ignition Engine

(C) Both (A) and (B)

(D) None of these Correct Answer

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

(A) Only air is introduced into the cylinder

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

1-3-4-2

1-4-3-2

1-3-2-4

1-2-3-4

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

API SF

SAE 30

SAE20 W50

API 50

27. 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

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

Contact areas of the tyres

Free plays of the steering wheel

Turning radius of the left and right wheels

Difference in the toe angles of the left and right wheels

29. 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

30. 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

Page 4 of 4

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

Reduces the engine's air intake noise

Controls the engine's air intake volume

Prevents rain water from entering the engine

Prevents dust and other foreign matter from entering the engine

32. The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft

Adjusts the timing of the intake and exhaust valve openings

Reduce vibrations caused by the crankshaft rotation

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

33. The exhaust gas from petrol engine contains

Petrol vapours

Water vapours

All of these

Carbon monoxide

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

Differential

Torque converter

Clutch

Flywheel

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

Same

Higher

Lower

Depends on fuel quality

36. The ignition coil is used to

Step up current

Step down voltage

Step up voltage

Step down current

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

166.94 N

1669.4 N

16.694 N

1.6694 N

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

Indicate the coolant temperature

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

Allow the engine to warm up quickly

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

Magnetic clutch

Hydraulic multi plate clutch

Planetary gear

Synchronizer

40. The piston compression rings are made of

Cast iron

Bronze

Steel

Aluminium

Automobile Engineering Practice Set-4

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Automobile Engineering Practice Set-4

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection