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IC Engines
0

IC Engines Practice Set-1

September 5, 2021

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Page 1 of 4

1. The fuels in order of decreasing knock tendency for spark ignition engines are

Paraffin, napthene, aromatic

Napthene, aromatics, paraffin

Napthene, paraffin, aromatic

Paraffin, aromatic, napthene

2. The maximum temperature in the I.C. engine cylinder is of the order of

2000-2500°C

1000-1500°C

1500-2000°C

500-1000°C

3. The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.

Very low

Low

Very high

High

4. In a four stroke cycle diesel engine, the compression

Starts at top dead center and ends at 40° before bottom dead center

May start and end anywhere

Starts at 40° after bottom dead center and ends at 10° before top dead center

Starts at 40° before top dead center and ends at 40° after top dead center

5. In a typical medium speed 4-stroke cycle diesel engine the inlet valve

Opens at 10° after top dead center and closes 20° before the bottom dead center

Opens at 20° before top dead center and closes at 35° after the bottom dead center

Opens at top dead center and closes at bottom dead center

May open or close anywhere

6. Detonation is harmful due to

None of the above

Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine

High intensity of knock causes crankshaft vibration and the engine runs rough

Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls

7. The mean effective pressure obtained from engine indicator indicates the

Minimum pressure

Instantaneous pressure at any instant

Maximum pressure developed

Average pressure

8. In a typical medium speed, 4-stroke cycle diesel engine

May start and end anywhere

Fuel injection starts at just before top dead center and ends just after top dead center

Fuel injection starts at top dead center and ends at 20° after top dead center

Fuel injection starts at 10° before top dead center and ends at 20° after top dead center

9. In a four stroke cycle petrol engine, the compression

Starts at 40° after bottom dead centre and ends at 30° before top dead centre

Starts at bottom dead centre and ends at top dead centre

Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre

May start and end anywhere

10. The operation of forcing additional air under pressure in the engine cylinder is known as

Supercharging

Pre-ignition

Turbulence

Scavenging

Page 2 of 4

11. Which one of the following engines will have heavier flywheel than the remaining ones?

30 kW four-stroke diesel engine running at 750 r.p.m.

30 kW two-stroke diesel engine running at 750 r.p.m.

30 kW two-stroke petrol engine running at 1500 r.p.m.

30 kW four-stroke petrol engine running at 1500 r.p.m.

12. Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine in r.p.m.

Equal to

One-half

Twice

Four-times

13. The theoretically correct air fuel ratio for petrol engine is of the order of

6: 1

12: 1

15: 1

9: 1

14. The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

Turbulence

Supercharging

Detonation

Pre-ignition

15. An engine indicator is used to determine the following

Temperature

m.e.p. and I.H.P.

Volume of cylinder

Speed

16. Crankcase explosion in I.C. engines usually occurs as

First a big explosion followed by a mil explosion

Both mild and big explosions occurs simultaneously

First a mild explosion followed by a bi explosion

Never occurs

17. Pick up the false statement

Theoretically correct mixture of air and petrol is approximately 15:1

High speed compression engines operate on dual combustion cycle

Thermal efficiency of diesel engine is about 34%

S.I. engines are quality governed engines

18. If the temperature of intake air in internal combustion engine increases, then its efficiency will

Increase

Remain same

Decrease

None of these

19. In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

Polymerisation

Detonation

Scavenging

Supercharging

20. The ignition of the charge by some hot surface within the engine before the passage of spark is called

Pre-ignition

Ignition delay

Detonation

Auto-ignition

Page 3 of 4

21. The pressure at the end of compression in the case of diesel engine is of the order of

35 kg/cm

20 kg/cm

6 kg/cm

12 kg/cm

22. Which of the following medium is compressed in a Diesel engine cylinder?

Fuel alone

Air and fuel

Air alone

Air and lub oil

23. The knocking in spark ignition engines can be reduced by

(A) Retarding the spark

(D) None of these

(C) Both (A) and (B)

(B) Increasing the engine speed

24. In compression ignition engines, swirl denotes a

Radial motion of the gases in the chamber

Rotary motion of the gases in the chamber

None of the above

Haphazard motion of the gases in the chamber

25. Compression ratio of I.C. Engines is

Volume displaced by piston per stroke and clearance volume in cylinder

Ratio of pressure after compression and before compression

Swept volume/cylinder volume

The ratio of volumes of air in cylinder before compression stroke and after compression stroke

26. Pick up the wrong statement about supercharging

Supercharging reduces knocking in diesel engines

Supercharging at high altitudes is essential

There can be limited supercharging in petrol engines because of detonation

Supercharging results in fuel economy

27. The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 - (1/r^{γ - 1})

1- r^{γ - 1}

1+ r^{γ - 1}

None of these

28. Which of the following is the lightest and most volatile liquid fuel?

Gasoline

Kerosene

Diesel

Fuel oil

29. The operation of forcing additional air under pressure into the engine cylinder is known as

Supercharging

Delay period

Turbulence

Carburetion

30. In the opposed piston diesel engine, the combustion chamber is located

There is no such criterion

Below the piston

Between the pistons

Above the piston

Page 4 of 4

31. The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is

May be more or less depending on engine capacity

Same

Less

More

32. A stoichiometric air-fuel ratio is

Chemically correct mixture

Rich mixture for over loads

Lean mixture

Rich mixture for idling

33. Supercharging is the process of

Providing forced cooling air

Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

Supplying compressed air to remove combustion products fully

Injecting excess fuel for raising more loads

34. The probability of knocking in diesel engines is increased by

High self ignition temperature

Higher viscosity

All of these

Low volatility

35. The rating of a diesel engine, with increase in air inlet temperature, will

Increase parabolically

Decrease linearly

Increase linearly

Decrease parabolically

36. If the temperature of intake air in IC engines is lowered, then its efficiency will

Increase

Remain same

Increase up to certain limit and then decrease

Decrease

37. In a four stroke cycle diesel engine, the exhaust valve

May open and close anywhere

Opens at 30° after bottom dead centre and closes at 10° before top dead centre

Opens at 30° before bottom dead centre and closes at 10° after top dead centre

Opens at bottom dead centre and closes at top dead centre

38. The ignition quality of petrol is expressed by

All of these

Cetane number

Octane number

Calorific value

39. Pour point of fuel oil is the

It catches fire without external aid

Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

Temperature at which it solidifies or congeals

Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

40. The firing order in an I.C. engine depends upon

Number of cylinders

Design of crankshaft

Arrangement of the cylinders

All of these

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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