Automobile Engineering Practice Set-4

Page 1 of 4

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

Differential

Torque converter

Clutch

Flywheel

2. 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

Section width to section height

Wheel diameter to section width

3. 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

4. The basic characteristics of a brake fluid is

All of these

A high boiling point

Low viscosity

Compatibility with rubber and metal parts

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

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

Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces

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

Prevents dust and other foreign matter from entering the engine

Prevents rain water from entering the engine

Controls the engine's air intake volume

Reduces the engine's air intake noise

7. The ignition coil is used to

Step down current

Step up voltage

Step down voltage

Step up current

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

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

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

Conduction, convection and radiation

Convention only

Convection and radiation

Radiation only

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

Detonation

Cleaning

Scavenging

Priming

Page 2 of 4

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

Aluminium

Ceramic

Cast iron

Brass

12. 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

Reduce vibrations caused by the crankshaft rotation

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

13. The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure

Adjust the extent of brake pedal free play

Boost the force applied to brake pedal

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

14. The two kinds of piston rings are

Oil scrapper and oil control rings

Compression and sliding seal rings

Compression and oil control rings

Pressure and sealing rings

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

SAE 30

API 50

SAE20 W50

API SF

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

60°

120°

90°

30°

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

Boring

Porous plating

Shot peening

Honing

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

Mixes fuel with air

Feeds blow by gases to the exhaust manifold

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

Returns blow by gases from the crankcase to the intake system

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

25-40

6-10

10-15

15-20

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

Planetary gear

Hydraulic multi plate clutch

Magnetic clutch

Synchronizer

Page 3 of 4

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

166.94 N

16.694 N

1.6694 N

1669.4 N

22. 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

Act as a reservoir or stabilizer of electricity

Supply electricity to the alternator

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

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

9000

900

90

9

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

70°C to 100°C

100°C to 120°C

120°C to 180°C

180°C to 360 °C

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

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

It blows air through the radiator when necessary

It draws heat out of the engine compartment

26. In Spark Ignition Engine

(A) Only air is introduced into the cylinder

(D) None of these Correct Answer

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

(C) Both (A) and (B)

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

Relief valve

Release chamber

Balancer

Stop valve

28. 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

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

Lower

Higher

Depends on fuel quality

Same

30. Free pedal play in car clutches is about

60 mm

15 mm

40 mm

25 mm

Page 4 of 4

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

1-2-3-4

1-3-2-4

1-4-3-2

1-3-4-2

32. The exhaust gas from petrol engine contains

All of these

Water vapours

Petrol vapours

Carbon monoxide

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

Decreases

Remains the same

Increases

None of these

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

It makes petrol engines lighter

Less compression ratio gives better performance

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

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

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

Left of the vehicle

Front of the vehicle

Right of the vehicle

Rear of the vehicle

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

Pressurise the system to raise the boiling point

Prevent the coolant from boiling

Indicate the coolant temperature

Allow the engine to warm up quickly

37. The piston compression rings are made of

Aluminium

Steel

Bronze

Cast iron

38. The discharged lead acid battery has on its plates

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Spongy lead (Pb)

39. The service brakes employed in cars are generally operated

None of these

Hydraulically

Mechanically

Pneumatically

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

300bar

200bar

220bar

250bar

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