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4

A compressor mostly used for supercharging of I.C. engines is

A. Radial flow compressor

B. Axial flow compressor

C. Roots blower

D. Reciprocating compressor

Correct Answer :

A. Radial flow compressor


Related Questions

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4

Only rocket engines can be propelled to space because

A. They can generate very high thrust

B. They have high propulsion efficiency

C. These engines can work on several fuels

D. They are not air breathing engines

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4

Rotary compressors are used for delivering

A. Small quantities of air at high pressures

B. Large quantities of air at high pressures

C. Small quantities of air at low pressures

D. Large quantities of air at low pressures

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4

Isothermal compression though most efficient, but is not practicable because

A. It requires very big cylinder

B. It does not increase pressure much

C. It is impossible in practice

D. Compressor has to run at very slow speed to achieve it

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4

Axial flow compressor has the following advantage over centrifugal compressor

A. Larger air handling ability per unit frontal area

B. Higher pressure ratio per stage

C. Aerofoil blades are used

D. Higher average velocities

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4

The volume of air delivered in a medium capacity air compressor per unit time is

A. 0.1 to 1.2 m³/s

B. 0.15 to 5 m³/s

C. Above 5 m³/s

D. None of these

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4

The compressor capacity is defined as the

A. Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

B. Volume of air delivered by the compressor

C. Volume of air sucked by the compressor during its suction stroke

D. None of the above

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4

For minimum work required to compress and deliver a quantity of air by multistage compression

A. The compression ratio in each stage should be same

B. The intercooling should be perfect

C. The workdone in each stage should be same

D. All of the above

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4

The axial flow compressor is preferred in aircraft gas turbines because of

A. Low frontal area

B. Higher thrust

C. High pressure rise

D. None of these

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4

Which of the following statement is correct?

A. The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency

B. The compression ratio for the compressor is always greater than unity

C. The compressor capacity is the ratio of workdone per cycle to the stroke volume

D. During isothermal compression of air, the workdone in a compressor is maximum

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4

The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

A. 0.1 %

B. 0.5 %

C. 1.0 %

D. 5 %

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4

In a centrifugal compressor, an increase in speed at a given pressure ratio causes

A. Increase in flow

B. Decrease in flow

C. Increase in efficiency

D. Increase in flow and decrease in efficiency

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4

Pick up the correct statement

A. Large gas turbines use radial inflow turbines

B. Gas turbines have their blades similar to steam turbine

C. Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip

D. Gas turbines use both air and liquid cooling

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4

Volumetric efficiency of a compressor decreases with ________ in compression ratio.

A. Decrease

B. Increase

C. Remain same

D. Does not change

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4

Propulsive efficiency is defined as ratio of

A. Thrust power and fuel energy

B. Engine output and propulsive power

C. Propulsive power and fuel input

D. Thrust power and propulsive power

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4

A simple turbojet engine is basically

A. A propeller system

B. Gas turbine engine equipped with a propulsive nozzle and diffuse

C. Chemical rocket engine

D. Ramjet engine

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4

Turbofan engine employs

A. One air stream

B. Two or more air streams

C. No air stream

D. Solid fuel firing

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4

The compression ratio for the compressor is always __________ unity.

A. Equal to

B. Less than

C. More than

D. None of these

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4

Mining industry usually employs following motive power

A. A.C. electric motor

B. Compressed air

C. Petrol engine

D. Diesel engine

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4

The power available for takeoff and climb in case of turbojet engine as compared to reciprocating engine is

A. Less

B. More

C. Same

D. May be less or more depending on ambient conditions

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4

The air power of the compressor is also known as

A. Indicated power

B. Brake power

C. Frictional power

D. None of these

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4

Ratio of compression is the ratio of

A. Gauge discharge pressure to the gauge intake pressure

B. Absolute discharge pressure to the absolute intake pressure

C. Pressures at discharge and suction corresponding to same temperature

D. Stroke volume and clearance volume

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4

In a single stage, single acting reciprocating air compressor, without clearance, the workdone on the air during isentropic compression is ________ the heat required to raise the temperature of air from T₁ to T₂ at a constant pressure.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

Fighter bombers use following type of engine

A. Turbojet

B. Turbo-propeller

C. Rocket

D. Ramjet

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4

The indicated work per unit mass of air delivered is

A. Directly proportional to clearance volume

B. Greatly affected by clearance volume

C. Not affected by clearance volume

D. Inversely proportional to clearance volume

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4

In turbo fan engine, the jet velocity as compared to turbojet engine is

A. Less

B. More

C. Same

D. May be less or more depending upon speed

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4

The ratio of workdone per cycle to the stroke volume of the compressor is known as

A. Compressor capacity

B. Compression ratio

C. Compressor efficiency

D. Mean effective pressure

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4

The maximum temperature in a gas turbine is

A. 200°C

B. 500°C

C. 700°C

D. 1000°C

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4

The ratio of isentropic work to Eulers work is known as

A. Compressor efficiency

B. Isentropic efficiency

C. Euler's efficiency

D. Pressure coefficient

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4

The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Intercooler pressure, and p₃ = Delivery pressure of air)

A. p₂ = p₁ × p₃

B. p₂ = p₁/p₃

C. p₂ = p₁ × p₂

D. p₂ = p₃/p₁

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4

Efficiency of gas turbine is increased by

A. Reheating

B. Inter cooling

C. Adding a regenerator

D. All of the above