A stoichiometric air-fuel ratio is

Question

A stoichiometric air-fuel ratio is

A. Chemically correct mixture

B. Lean mixture

C. Rich mixture for idling

D. Rich mixture for over loads

Share this question with your friends

Show all Internal Combustion MCQ

Comment

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

Discuss this answer

Diesel as compared to petrol is

A. Highly ignitable

B. More difficult to ignite

C. Less difficult to ignite

D. None of these

Discuss this answer

The ratio of the indicated thermal efficiency to the air standard efficiency is known as

A. Mechanical efficiency

B. Overall efficiency

C. Volumetric efficiency

D. Relative efficiency

Discuss this answer

In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.

A. Not effected

B. Decrease

C. Increase

D. None of these

Discuss this answer

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

Discuss this answer

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

Discuss this answer

The pressure at the end of compression, in diesel engines, is approximately

A. 10 bar

B. 20 bar

C. 25 bar

D. 35 bar

Discuss this answer

The air-fuel ratio in petrol engines is controlled by

A. Controlling valve opening/closing

B. Governing

C. Injection

D. Carburetion

Discuss this answer

The air-fuel ratio of the petrol engine is controlled by

A. Carburettor

B. Injector

C. Governor

D. None of these

Discuss this answer

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

Discuss this answer

The ignition quality of petrol is expressed by

A. Cetane number

B. Octane number

C. Calorific value

D. All of these

Discuss this answer

The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

A. Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine

B. Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine

C. Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine

D. Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine

Discuss this answer

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

A. Scavenging

B. Turbulence

C. Supercharging

D. Pre-ignition

Discuss this answer

The frictional power (F.P.) is given by

A. F.P. = B.P. - I.P.

B. F.P. = I.P. - B.P.

C. F.P. = B.P./I.P.

D. F.P. = I.P./B.P.

Discuss this answer

The increase of efficiency of a compression ignition engine, as the load decreases, is due to

A. Higher maximum temperature

B. Qualitative governing

C. Quantitative governing

D. Hit and miss governing

Discuss this answer

The reference fuels for knock rating of spark ignition engines would include

A. Iso-octane and alpha-methyl naphthalene

B. Normal octane and aniline

C. Isooctane and normal hexane

D. Normal heptane and isooctane

Discuss this answer

As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

A. Increase maximum pressure and maximum temperature

B. Reduce maximum pressure and maximum temperature

C. Increase maximum pressure and decrease maximum temperature

D. Decrease maximum pressure and increase maximum temperature

Discuss this answer

The reflectivity depends upon

A. Geometry of the reflector

B. Energy of neutrons

C. Properties of the reflector

D. All of these

Discuss this answer

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

A. Paraffin, aromatic, napthene

B. Paraffin, napthene, aromatic

C. Napthene, aromatics, paraffin

D. Napthene, paraffin, aromatic

Discuss this answer

Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.

A. Equal to

B. Less than

C. Greater than

D. None of these

Discuss this answer

Most high speed compression engines operate on

A. Otto cycle

B. Diesel cycle

C. Dual cycle

D. Carnot cycle

Discuss this answer

The ignition quality of diesel oil is expressed by

A. Cetane number

B. Octane number

C. Calorific value

D. None of these

Discuss this answer

Iso-octane (C₈H₁₈) has octane number of

A. 0

B. 50

C. 100

D. 120

Discuss this answer

A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.

A. Half

B. Same

C. Double

D. Four times

Discuss this answer

In a petrol engine, if diesel is used, then the engine will

A. Not run

B. Run more efficiently

C. Run at high speed

D. Explode

Discuss this answer

In a diesel engine, the fuel is ignited by

A. Spark

B. Injected fuel

C. Heat resulting from compressing air that is supplied for combustion

D. Ignition

Discuss this answer

In a cycle, the spark lasts roughly for

A. 1 sec

B. 0.1 sec

C. 0.01 sec

D. 0.001 sec

Discuss this answer

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

A. Not effect

B. Decrease

C. Increase

D. None of these

Discuss this answer

The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

A. Same

B. Less

C. More

D. More or less depending on power rating

Discuss this answer

Engine pistons are usually made of aluminium alloy because it

A. Is lighter

B. Wear is less

C. Absorbs shocks

D. Is stronger

Discuss this answer

Accepted Answer

A. Chemically correct mixture

A stoichiometric air-fuel ratio is

Correct Answer :

Show all Internal Combustion MCQ

Related Questions

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

Diesel as compared to petrol is

The ratio of the indicated thermal efficiency to the air standard efficiency is known as

In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.

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

The mean effective pressure obtained from engine indicator indicates the

The pressure at the end of compression, in diesel engines, is approximately

The air-fuel ratio in petrol engines is controlled by

The air-fuel ratio of the petrol engine is controlled by

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 ignition quality of petrol is expressed by

The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

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

The frictional power (F.P.) is given by

The increase of efficiency of a compression ignition engine, as the load decreases, is due to

The reference fuels for knock rating of spark ignition engines would include

As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

The reflectivity depends upon

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

Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.

Most high speed compression engines operate on

The ignition quality of diesel oil is expressed by

Iso-octane (C₈H₁₈) has octane number of

A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.

In a petrol engine, if diesel is used, then the engine will

In a diesel engine, the fuel is ignited by

In a cycle, the spark lasts roughly for

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

The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

Engine pistons are usually made of aluminium alloy because it

Also checkout

A stoichiometric air-fuel ratio is

Correct Answer :

Show all Internal Combustion MCQ

Related Questions

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

Diesel as compared to petrol is

The ratio of the indicated thermal efficiency to the air standard efficiency is known as

In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.

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

The mean effective pressure obtained from engine indicator indicates the

The pressure at the end of compression, in diesel engines, is approximately

The air-fuel ratio in petrol engines is controlled by

The air-fuel ratio of the petrol engine is controlled by

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 ignition quality of petrol is expressed by

The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

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

The frictional power (F.P.) is given by

The increase of efficiency of a compression ignition engine, as the load decreases, is due to

The reference fuels for knock rating of spark ignition engines would include

As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

The reflectivity depends upon

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

Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.

Most high speed compression engines operate on

The ignition quality of diesel oil is expressed by

Iso-octane (C8H18) has octane number of

A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.

In a petrol engine, if diesel is used, then the engine will

In a diesel engine, the fuel is ignited by

In a cycle, the spark lasts roughly for

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

The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

Engine pistons are usually made of aluminium alloy because it

Also checkout

Iso-octane (C₈H₁₈) has octane number of