The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

Question

The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

A. 25 %

B. 50 %

C. 70 %

D. 100 %

Correct Answer :

B. 50 %

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Detonation is harmful due to

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Polymerisation is a chemical process in which molecules of a compound become

A. Larger

D. Liquid

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High speed compression engines operate on

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In a typical medium speed 4-stroke cycle diesel engine

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In a diesel engine, the duration between the time of injection and ignition, is known as

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The size of inlet valve of an engine in comparison to exhaust valve is

A. More

B. Less

C. Same

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

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Air fuel ratio for idling speed of a petrol engine is approximately

A. 1 : 1

B. 5 : 1

C. 10 : 1

D. 15 : 1

Discuss this answer

If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be

A. 2 %

B. 4 %

C. 8 %

D. 14 %

Discuss this answer

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

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The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is

A. Same

B. More

C. Less

Discuss this answer

The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.

B. Reduce

Discuss this answer

The ratio of the brake power to the indicated power is called

Discuss this answer

Antiknock for compression ignition engines is

Discuss this answer

In a four stroke cycle petrol engine, the charge is ignited at

Discuss this answer

The power actually developed by the engine cylinder of an I.C. engine is known as

Discuss this answer

The self ignition temperature of petrol is ________ as compared to diesel oil.

A. Same

B. Lower

C. Higher

Discuss this answer

A stoichiometric air-fuel ratio is

Discuss this answer

Iso-octane (C₈H₁₈) has octane number of

A. 0

B. 50

C. 100

D. 120

Discuss this answer

If the speed of the engine is increased, the indicated power will

Discuss this answer

The process of breaking up or a liquid into fine droplets by spraying is called

Discuss this answer

In compression ignition engines, swirl denotes a

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Fuel oil consumption guarantees for I .C. engine are usually based on

Discuss this answer

The specific fuel consumption per BH hour for a petrol engine is approximately

B. 0.2 kg

D. 0.3 kg

Discuss this answer

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

Discuss this answer

The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

A. 25 %

B. 50 %

C. 70 %

D. 100 %

Discuss this answer

The fuel valve in a four stroke cycle diesel engine

Discuss this answer

In a four stroke cycle diesel engine, the exhaust valve

Discuss this answer

The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of

A. 0

B. 50

C. 100

D. 120

Discuss this answer

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

D. None of the above

Answer 5

A. Naturally aspirated

Answer 6

B. Supercharged

Answer 7

C. Centrifugal pump

Answer 8

D. Turbo charger

Answer 9

B. Slowed down

Answer 10

C. Smaller

Answer 11

A. Otto cycle

Answer 12

B. Diesel cycle

Answer 13

C. Dual combustion cycle

Answer 14

D. All of these

Answer 15

A. Compression starts at 35° after bottom dead center and ends at top dead center

Answer 16

B. Compression starts at bottom dead center and ends at top dead center

Answer 17

C. Compression starts at 10° before bottom dead center and, ends just before top dead center

Answer 18

D. May start and end anywhere

Answer 19

A. Pre-ignition period

Answer 20

B. Delay period

Answer 21

C. Period of ignition

Answer 22

D. Burning period

Answer 23

D. More/less depending on capacity of engine

Answer 24

A. Supercharging

Answer 25

B. Carburetion

Answer 26

C. Turbulence

Answer 27

D. Delay period

Answer 28

A. Paraffin, aromatic, napthene

Answer 29

B. Paraffin, napthene, aromatic

Answer 30

C. Napthene, aromatics, paraffin

Answer 31

D. Napthene, paraffin, aromatic

Answer 32

D. Less or more depending on operating conditions

Answer 33

A. Increase

Answer 34

C. Not effect

Answer 35

D. None of these

Answer 36

A. Mechanical efficiency

Answer 37

B. Overall efficiency

Answer 38

C. Indicated thermal efficiency

Answer 39

D. Volumetric efficiency

Answer 40

A. Napthene

Answer 41

B. Tetra ethyl lead

Answer 42

C. Amyl nitrate

Answer 43

D. Hexadecane

Answer 44

A. 30° before top dead centre

Answer 45

B. 30° after top dead centre

Answer 46

C. 30° before bottom dead centre

Answer 47

D. 30° after bottom dead centre

Answer 48

A. Theoretical power

Answer 49

B. Actual power

Answer 50

C. Indicated power

Answer 51

D. None of these

Answer 52

D. None of these

Answer 53

A. Chemically correct mixture

Answer 54

B. Lean mixture

Answer 55

C. Rich mixture for idling

Answer 56

D. Rich mixture for over loads

Answer 57

A. Increase

Answer 58

B. Decrease

Answer 59

C. Remain same

Answer 60

D. None of these

Answer 61

A. Vaporisation

Answer 62

B. Carburetion

Answer 63

C. Ionisation

Answer 64

D. Atomisation

Answer 65

A. Haphazard motion of the gases in the chamber

Answer 66

B. Rotary motion of the gases in the chamber

Answer 67

C. Radial motion of the gases in the chamber

Answer 68

D. None of the above

Answer 69

A. Low heat value of oil

Answer 70

B. High heat value of oil

Answer 71

C. Net calorific value of oil

Answer 72

D. Calorific value of fuel

Answer 73

A. 0.15 kg

Answer 74

C. 0.25 kg

Answer 75

A. Pre-ignition

Answer 76

B. Detonation

Answer 77

C. Ignition delay

Answer 78

D. Auto-ignition

Answer 79

A. Opens at 15° after top dead centre and closes at 20° before bottom dead centre

Answer 80

B. Opens at 15° before top dead centre and closes at 20° after top dead centre

Answer 81

C. Opens at top dead centre and closes at bottom dead centre

Answer 82

D. May open and close anywhere

Answer 83

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

Answer 84

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

Answer 85

C. Opens at bottom dead centre and closes at top dead centre

Answer 86

D. May open and close anywhere

The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

Correct Answer :

Show all Internal Combustion MCQ

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In a typical medium speed 4-stroke cycle diesel engine

In a diesel engine, the duration between the time of injection and ignition, is known as

The size of inlet valve of an engine in comparison to exhaust valve is

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The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is

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The process of breaking up or a liquid into fine droplets by spraying is called

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The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

Correct Answer :

Show all Internal Combustion MCQ

Related Questions

Detonation is harmful due to

For the same power developed in I.C. engines, the cheaper system is

Polymerisation is a chemical process in which molecules of a compound become

High speed compression engines operate on

In a typical medium speed 4-stroke cycle diesel engine

In a diesel engine, the duration between the time of injection and ignition, is known as

The size of inlet valve of an engine in comparison to exhaust valve is

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

Air fuel ratio for idling speed of a petrol engine is approximately

If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be

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

The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is

The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.

The ratio of the brake power to the indicated power is called

Antiknock for compression ignition engines is

In a four stroke cycle petrol engine, the charge is ignited at

The power actually developed by the engine cylinder of an I.C. engine is known as

The self ignition temperature of petrol is ________ as compared to diesel oil.

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Iso-octane (C8H18) has octane number of

If the speed of the engine is increased, the indicated power will

The process of breaking up or a liquid into fine droplets by spraying is called

In compression ignition engines, swirl denotes a

Fuel oil consumption guarantees for I .C. engine are usually based on

The specific fuel consumption per BH hour for a petrol engine is approximately

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

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The fuel valve in a four stroke cycle diesel engine

In a four stroke cycle diesel engine, the exhaust valve

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The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of