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What is the correct answer?

4

For perfect intercooling in a three stage compressor

A. p₂/p₁ = p₃/p₂ = p₄/p₃

B. p₃/p₁ = p₄/p₂

C. p₁ p₂ = p₃ p₄

D. p₁ p₃ = p₂ p₄

Correct Answer :

A. p₂/p₁ = p₃/p₂ = p₄/p₃


Related Questions

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4

Work ratio of a gas turbine may be improved by

A. Decreasing the compression work

B. Increasing the compression work

C. Increasing the turbine work

D. Both (A) and (C) above

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4

Separators are generally used in air compressor installations

A. Before the intercooler

B. After the intercooler

C. Between the aftercooler and receiver

D. Before first stage suction

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4

If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches

A. Isothermal

B. Isentropic

C. Adiabatic

D. Isochoric

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4

Reheating in a gas turbine

A. Increases the thermal efficiency

B. Increases the compressor work

C. Increases the turbine work

D. Decreases the thermal efficiency

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4

The fuel consumption in gas turbines is accounted for by

A. Lower heating value

B. Higher heating value

C. Heating value

D. Higher calorific value

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4

A closed gas turbine in which fuel is burnt directly in the air is not possible because of

A. Paucity of O2

B. Increasing gas temperature

C. High specific volume

D. High friction losses

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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 net work input required for compressor with increase in clearance volume

A. Increases

B. Decreases

C. Remains same

D. Increases/decreases depending on compressor capacity

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4

Which of the following fuels can be used in turbojet engines?

A. Liquid hydrogen

B. High speed diesel oil

C. Kerosene

D. Methyl alcohol

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4

For speed above 3000 km/hour, it is more advantageous to use

A. Turbojet engine

B. Ramjet engine

C. Propellers

D. Rockets

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4

Actual compression curve is

A. Same as isothermal

B. Same as adiabatic

C. Better than isothermal and adiabatic

D. In between isothermal and adiabatic

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4

Which of the following statement is correct as regard to centrifugal compressors?

A. The flow of air is parallel to the axis of the compressor

B. The static pressure of air in the impeller increases in order to provide centripetal force on the air

C. The impeller rotates at high speeds

D. The maximum efficiency is higher than multistage axial flow compressors

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4

In a high pressure compressor, the delivery pressure is

A. 1 to 5 bar

B. 5 to 8 bar

C. 8 to 10 bar

D. 10 to 15 bar

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4

A rotary compressor is driven by an

A. Electric motor

B. Engine

C. Either (A) or (B)

D. None of these

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4

Aeroplanes employ following type of compressor

A. Radial flow

B. Axial flow

C. Centrifugal

D. None of the above

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4

The volume of air delivered by the compressor is called

A. Free air delivery

B. Compressor capacity

C. Swept volume

D. None of these

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4

In a reciprocating air compressor, the compression work per kg of air

A. Increases as clearance volume increases

B. Decreases as clearance volume increases

C. Is independent of clearance volume

D. Increases as clearance volume decreases

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4

In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone is minimum during

A. Isothermal compression

B. Isentropic compression

C. Polytropic compression

D. None of these

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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

The pressure of air at the beginning of the compression stroke is ________ the atmospheric pressure.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The ideal efficiency of simple gas turbine cycle depends on

A. Pressure ratio

B. Maximum cycle temperature

C. Minimum cycle temperature

D. All of the above

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4

In a single stage, single acting reciprocating air compressor without clearance volume, the workdone is maximum during

A. Isothermal compression

B. Isentropic compression

C. Polytropic compression

D. None of these

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4

The maximum compression ratio in an actual single stage axial flow compressor is of the order of

A. 1 : 1.2

B. 1 : 2

C. 1 : 5

D. 1 : 10

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4

In a four stage compressor, if the pressure at the first and third stage is 1 bar and 16 bar, then the delivery pressure at the fourth stage will be

A. 1 bar

B. 16 bar

C. 64 bar

D. 256 bar

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4

Surging is the phenomenon of

A. Air stream blocking the passage

B. Motion of air at sonic velocity

C. Unsteady, periodic and reversed flow

D. Air stream not able to follow the blade contour

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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

In axial flow compressor, exit flow angle deviation from the blade angle is a function of

A. Blade camber

B. Blade camber and incidence angle

C. Spacechord ratio

D. Blade camber and spacechord ratio

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4

Pick up the correct statement

A. Closed cycle gas turbine is an I.C engine

B. Gas turbine uses same working fluid over and over again

C. Ideal efficiency of closed cycle gas turbine plant is more than Carnot cycle efficiency

D. Thrust in turbojet is produced by nozzle exit gases.

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4

The velocity of air entering in a rocket is ________ as compared to an aircraft.

A. Zero

B. Less

C. More

D. Same

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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