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4

The work ratio of simple gas turbine cycle depends on

A. Pressure ratio

B. Maximum cycle temperature

C. Minimum cycle temperature

D. All of the above

Correct Answer :

D. All of the above


Related Questions

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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 work ratio of a gas turbine plant is defined as the ratio of

A. Net work output and heat supplied

B. Net work output and work done by turbine

C. Actual heat drop and isentropic heat drop

D. Net work output and isentropic heat drop

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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

In jet propulsion power unit, the inlet duct of diverging shape is used in order to

A. Collect more air

B. Convert kinetic energy of air into pressure energy

C. Provide robust structure

D. Beautify the shape

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4

The capacity of a compressor is expressed in

A. kg/m²

B. kg/m³

C. m³/min

D. m³/kg

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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 minimum work required for a three stage reciprocating air compressor is ________ the work required for each stage.

A. Equal to

B. Double

C. Three times

D. Six times

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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

Aeroplanes employ following type of compressor

A. Radial flow

B. Axial flow

C. Centrifugal

D. None of the above

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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

For perfect intercooling in a two stage compressor

A. p₂/p₁ = p₃/p₂

B. p₁/p₃ = p₂/p₁

C. p₁ = p₃

D. p₁ = p₂ p₃

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4

The pressure ratio of an ideal vaned compressor with increase in mass flow rate

A. Increases

B. Decreases

C. Remain constant

D. First decreases and then increases

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4

The type of rotary compressor used in aeroplanes, is of

A. Centrifugal type

B. Axial flow type

C. Radial flow type

D. None of these

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4

The performance of air compressor at high altitudes will be ________ as compared to that at sea level.

A. Same

B. Lower

C. Higher

D. None of these

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4

In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

A. Diffuser inlet radius

B. Diffuser outlet radius

C. Impeller inlet radius

D. Impeller outlet radius

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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

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

A. Remain same

B. Decrease

C. Increase

D. None of the above

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4

In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to

A. N.T.P. conditions

B. Intake temperature and pressure conditions

C. 0°C and 1 kg/cm²

D. 20°C and 1 kg/cm²

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4

Volumetric efficiency of a compressor with clearance volume

A. Increases with increase in compression ratio

B. Decreases with increase in compression ratio

C. In not dependent upon compression ratio

D. May increase/decrease depending on compressor capacity

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4

Pick up the wrong statement

A. Large gas turbines employ axial flow compressors

B. Axial flow compressors are more stable than centrifugal type compressors but not as efficient

C. Axial flow compressors have high capacity and efficiency

D. Axial flow compressors have instability region of operation

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4

Ratio of indicated H.P. and brake H.P. is known as

A. Mechanical efficiency

B. Volumetric efficiency

C. Isothermal efficiency

D. Adiabatic efficiency

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4

The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

A. 75 %

B. 85 %

C. 90 %

D. 99 %

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4

The weight per horse power ratio for gas in Turbine as compared to I.C. engine and steam turbine is

A. Same

B. Higher

C. Lower

D. None of these

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4

If the flow of air through the compressor is parallel to its axis, then the compressor is

A. Reciprocating compressor

B. Centrifugal compressor

C. Axial flow compressor

D. Turbo compressor

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4

High air-fuel ratio in gas turbines

A. Increases power output

B. Improves thermal efficiency

C. Reduces exhaust temperature

D. Do not damage turbine blades

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4

If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix I and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

A. Vi = Vo

B. Vt > Vo

C. U < Vo

D. V = Uo

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4

The work done per unit mass of air in compression will be least when n is equal to

A. 1

B. 1.2

C. 1.3

D. 1.4

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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

To avoid moisture troubles, the compressed air main line should

A. Rise gradually towards the point of use

B. Drop gradually towards the point of use

C. Be laid vertically

D. Be laid exactly horizontally

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4

The ratio of specific weight/h.p. of gas turbine and I.C engines may be typically of the order of

A. 1 : 1

B. 2 : 1

C. 4 : 1

D. 1 : 6