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

Question

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

A. Detonation

B. Turbulence

C. Pre-ignition

D. Supercharging

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Iso-octane (C₈H₁₈) has octane number of

A. 0

B. 50

C. 100

D. 120

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In a four stroke cycle petrol engine, the inlet valve

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

B. Opens at 20° before top dead centre and closes at 40° after bottom dead centre

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

D. May open or close anywhere

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The mechanical efficiency (ηm) of the engine is given by

A. η_m = B.P/I.P

B. η_m = I.P/B.P

C. η_m = (B.P × I.P)/100

D. None of these

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The mean effective pressure obtained from engine indicator indicates the

A. Maximum pressure developed

B. Minimum pressure

C. Instantaneous pressure at any instant

D. Average pressure

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The cetane number of diesel oil, generally available, is

A. 20 to 25

B. 25 to 30

C. 30 to 40

D. 40 to 55

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The increase of cooling water temperature in petrol engine will __________ the knocking tendency.

A. Not effect

B. Decrease

C. Increase

D. None of these

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Most high speed compression engines operate on

A. Otto cycle

B. Diesel cycle

C. Dual cycle

D. Carnot cycle

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In a typical medium speed 4-stroke cycle diesel engine

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

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

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

D. May start and end anywhere

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

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

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

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

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

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If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the

A. Exhaust will be smoky

B. Piston rings would stick into piston grooves

C. Engine starts overheating

D. Scavenging occurs

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The colour of exhaust from diesel engine is generally

A. White

B. Bluish

C. Black

D. Violet

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Which of the following statement is wrong?

A. A four stroke cycle engine develops twice the power as that of a two stroke cycle engine

B. For the same power developed, a four stroke cycle engine is lighter, less bulky and occupies less floor area

C. The petrol engines are costly than diesel engines

D. All of the above

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A heat engine utilises the

A. Calorific value of oil

B. Low heat value of

C. High heat value of oil

D. Mean heat value of oil

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The brake power is the power available

A. In the engine cylinder

B. At the crank shaft

C. At the crank pin

D. None of these

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In the crankcase method of scavenging, the air pressure is produced by

A. Supercharger

B. Centrifugal pump

C. Natural aspirator

D. Movement of engine piston

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Air fuel ratio at which a petrol engine cannot work is

A. 8 : 1

B. 10 : 1

C. 15 : 1

D. 20 : 1 and less

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The ignition quality of diesel oil is expressed by

A. Cetane number

B. Octane number

C. Calorific value

D. None of these

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The spark ignition engines are governed by

A. Hit and miss governing

B. Qualitative governing

C. Quantitative governing

D. Combination of (B) and (C)

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

A. Scavenging

B. Turbulence

C. Supercharging

D. Pre-ignition

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

A. 1 - r^{γ - 1}

B. 1 + r^{γ - 1}

C. 1 - (1/r^{γ - 1})

D. None of these

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All heat engines utilize

A. Low heat value of oil

B. High heat value of oil

C. Net calorific value of oil

D. Calorific value of fuel

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

A. Low heat value of oil

B. High heat value of oil

C. Net calorific value of oil

D. Calorific value of fuel

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

A. Mechanical efficiency

B. Overall efficiency

C. Indicated thermal efficiency

D. Volumetric efficiency

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In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

A. Equal to

B. Below

C. Above

D. None of these

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Morse test is used to determine the I.P. of a

A. Single cylinder petrol engine

B. Four stroke engine

C. Single cylinder diesel engine

D. Multi cylinder engine

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Pick up the false statement

A. Thermal efficiency of diesel engine is about 34%

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

C. High speed compression engines operate on dual combustion cycle

D. S.I. engines are quality governed engines

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The maximum propulsive efficiency of a turbojet engine is at a speed of

A. 1000 km/h

B. 2000 km/h

C. 2400 km/h

D. 3000 km/h

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The knocking in diesel engines may be prevented by

A. Reducing the delay period

B. Raising the compression ratio

C. Increasing the inlet pressure of air

D. All of these

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In a four stroke cycle diesel engine, the inlet valve

A. Opens at 20° before top dead centre and closes at 40° after bottom dead centre

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

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

D. May open and close anywhere

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The specific fuel consumption per B.P. hour for a diesel engine is about

A. 0.2 kg

B. 0.25 kg

C. 0.3 kg

D. 0.35 kg

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Accepted Answer

A. Detonation

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

Correct Answer :

Show all Internal Combustion MCQ

Related Questions

Iso-octane (C₈H₁₈) has octane number of

In a four stroke cycle petrol engine, the inlet valve

The mechanical efficiency (ηm) of the engine is given by

The mean effective pressure obtained from engine indicator indicates the

The cetane number of diesel oil, generally available, is

The increase of cooling water temperature in petrol engine will __________ the knocking tendency.

Most high speed compression engines operate on

In a typical medium speed 4-stroke cycle diesel engine

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

If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the

The colour of exhaust from diesel engine is generally

Which of the following statement is wrong?

A heat engine utilises the

The brake power is the power available

In the crankcase method of scavenging, the air pressure is produced by

Air fuel ratio at which a petrol engine cannot work is

The ignition quality of diesel oil is expressed by

The spark ignition engines are governed by

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

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

All heat engines utilize

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

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

In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

Morse test is used to determine the I.P. of a

Pick up the false statement

The maximum propulsive efficiency of a turbojet engine is at a speed of

The knocking in diesel engines may be prevented by

In a four stroke cycle diesel engine, the inlet valve

The specific fuel consumption per B.P. hour for a diesel engine is about

Also checkout

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

Correct Answer :

Show all Internal Combustion MCQ

Related Questions

Iso-octane (C8H18) has octane number of

In a four stroke cycle petrol engine, the inlet valve

The mechanical efficiency (ηm) of the engine is given by

The mean effective pressure obtained from engine indicator indicates the

The cetane number of diesel oil, generally available, is

The increase of cooling water temperature in petrol engine will __________ the knocking tendency.

Most high speed compression engines operate on

In a typical medium speed 4-stroke cycle diesel engine

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

If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the

The colour of exhaust from diesel engine is generally

Which of the following statement is wrong?

A heat engine utilises the

The brake power is the power available

In the crankcase method of scavenging, the air pressure is produced by

Air fuel ratio at which a petrol engine cannot work is

The ignition quality of diesel oil is expressed by

The spark ignition engines are governed by

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

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

All heat engines utilize

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

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

In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

Morse test is used to determine the I.P. of a

Pick up the false statement

The maximum propulsive efficiency of a turbojet engine is at a speed of

The knocking in diesel engines may be prevented by

In a four stroke cycle diesel engine, the inlet valve

The specific fuel consumption per B.P. hour for a diesel engine is about

Also checkout

Iso-octane (C₈H₁₈) has octane number of