The ignition quality of petrol is expressed by

Question

The ignition quality of petrol is expressed by

A. Cetane number

B. Octane number

C. Calorific value

D. All of these

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The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in metres, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)

A. B.P = (Wl × 2πN)/60 watts

B. B.P = [(W - S) πDN]/60 watts

C. B.P = [(W - S) π (D + d) N]/60 watts

D. All of these

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The air standard efficiency of an I.C. engine depends on

A. Fuel used

B. Speed of engine

C. Compression ratio

D. None of these

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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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For the same compression ratio

A. Otto cycle is more efficient than the Diesel

B. Diesel cycle is more efficient than Otto

C. Both Otto and Diesel cycles are, equally efficient

D. Compression ratio has nothing to do with efficiency

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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 %

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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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Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

A. Inlet valve closing after bottom dead centre

B. Inlet valve closing before bottom dead centre

C. Inlet valve opening before top dead centre

D. Exhaust valve closing after top dead centre

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

A. Scavenging

B. Detonation

C. Supercharging

D. Polymerisation

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If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is

A. V₁/(V₀ + V₁)

B. V₀/(V₀ + V₁)

C. 2V₀/(V₀ + V₁)

D. 2V₁/(V₀ + V₁)

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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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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 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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The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

A. Same

B. Less

C. More

D. None of these

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In loop scavenging, the top of the piston is

A. Flat

B. Contoured

C. Slanted

D. Depressed

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The fuel valve in a four stroke cycle diesel engine

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

B. Opens at 15° before top dead centre and closes at 20° after top 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 knock in diesel engine occurs due to

A. Instantaneous and rapid burning of the first part of the charge

B. Instantaneous auto ignition of last part of charge

C. Delayed burning of the first part of the charge

D. Reduction of delay period

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In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then _________ is employed.

A. Fuel pump

B. Injector

C. Carburettor

D. None of these

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The exhaust valve in a four stroke cycle petrol engine

A. Opens at 50° before bottom dead centre and closes at 15° after top dead centre

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

C. Opens at 50° after bottom dead centre and closes at 15° before top dead centre

D. May open and close anywhere

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During idling, a petrol engine requires _________ mixture.

A. Lean

B. Rich

C. Chemically correct

D. None of these

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Antiknock for compression ignition engines is

A. Napthene

B. Tetra ethyl lead

C. Amyl nitrate

D. Hexadecane

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

A. Theoretical power

B. Actual power

C. Indicated power

D. None of these

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The increase in intake temperature of internal combustion engines will _________ efficiency.

A. Have no effect on

B. Increase

C. Decrease

D. None of these

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The object of providing masked inlet valve in the air passage of compression ignition engines is to

A. Enhance flow rate

B. Control air flow

C. Induce primary swirl

D. Induce secondary turbulence

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In a naturally aspirated diesel engine, the air is supplied by

A. A supercharger

B. A centrifugal blower

C. A vacuum chamber

D. An injection tube

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The delay period in compression ignition engines depends upon

A. Temperature and pressure in the cylinder at the time of injection

B. Nature of the fuel mixture strength

C. Relative velocity between the fuel injection and air turbulence pressure of residual gases

D. All of the above

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The term scavenging is generally associated with

A. 2-stroke cycle engines

B. 4-stroke cycle engines

C. Aeroplane engines

D. High efficiency engines

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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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Crankcase explosion in I.C. engines usually occurs as

A. First a mild explosion followed by a bi explosion

B. First a big explosion followed by a mil explosion

C. Both mild and big explosions occurs simultaneously

D. Never occurs

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The specific fuel consumption per BHP hour for diesel engine is approximately

A. 0.15 kg

B. 0.2 kg

C. 0.25 kg

D. 0.3 kg

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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

B. Octane number

The ignition quality of petrol is expressed by

Correct Answer :

Show all Internal Combustion MCQ

Related Questions

The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in metres, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)

The air standard efficiency of an I.C. engine depends on

Air fuel ratio at which a petrol engine cannot work is

For the same compression ratio

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

Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

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

If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is

The spark ignition engines are governed by

Iso-octane (C₈H₁₈) has octane number of

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

The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

In loop scavenging, the top of the piston is

The fuel valve in a four stroke cycle diesel engine

The knock in diesel engine occurs due to

In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then _________ is employed.

The exhaust valve in a four stroke cycle petrol engine

During idling, a petrol engine requires _________ mixture.

Antiknock for compression ignition engines is

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

The increase in intake temperature of internal combustion engines will _________ efficiency.

The object of providing masked inlet valve in the air passage of compression ignition engines is to

In a naturally aspirated diesel engine, the air is supplied by

The delay period in compression ignition engines depends upon

The term scavenging is generally associated with

Most high speed compression engines operate on

Crankcase explosion in I.C. engines usually occurs as

The specific fuel consumption per BHP hour for diesel engine is approximately

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

Also checkout

The ignition quality of petrol is expressed by

Correct Answer :

Show all Internal Combustion MCQ

Related Questions

The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in metres, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)

The air standard efficiency of an I.C. engine depends on

Air fuel ratio at which a petrol engine cannot work is

For the same compression ratio

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

Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

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

If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is

The spark ignition engines are governed by

Iso-octane (C8H18) has octane number of

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

The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

In loop scavenging, the top of the piston is

The fuel valve in a four stroke cycle diesel engine

The knock in diesel engine occurs due to

In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then _________ is employed.

The exhaust valve in a four stroke cycle petrol engine

During idling, a petrol engine requires _________ mixture.

Antiknock for compression ignition engines is

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

The increase in intake temperature of internal combustion engines will _________ efficiency.

The object of providing masked inlet valve in the air passage of compression ignition engines is to

In a naturally aspirated diesel engine, the air is supplied by

The delay period in compression ignition engines depends upon

The term scavenging is generally associated with

Most high speed compression engines operate on

Crankcase explosion in I.C. engines usually occurs as

The specific fuel consumption per BHP hour for diesel engine is approximately

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

Also checkout

Iso-octane (C₈H₁₈) has octane number of