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4

For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum pressure, and p₂ = Minimum pressure)

A. (p₁ - p₂)/2

B. (p₁ + p₂)/2

C. p₁/p₂

D. p₁ p₂

Correct Answer :

D. p₁ p₂


Related Questions

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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

Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on

A. Mass flow rate

B. Pressure ratio

C. Change in load

D. Stagnation pressure at the outlet

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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 stagnation pressure rise in a centrifugal compressor takes place

A. In the diffuser only

B. In the impeller only

C. In the diffuser and impeller

D. In the inlet guide vanes only

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4

Gas turbine blades are given a rake

A. Equal to zero

B. In the direction of motion of blades

C. Opposite to the direction of motion of blades

D. Depending on the velocity

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4

Propulsion efficiency of the following order is obtained in practice

A. 34 %

B. 50 %

C. 60 %

D. 72 %

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4

Cylinder clearance in a compressor should be

A. As large as possible

B. As small as possible

C. About 50% of swept volume

D. About 100% of swept volume

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4

The maximum combustion pressure in gas turbine as compared to I.C. engine is

A. More

B. Less

C. Same

D. Depends on other factors

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4

A jet engine has

A. No propeller

B. Propeller in front

C. Propeller at back

D. Propeller on the top

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4

Maximum temperature in a gas turbine is of the order of

A. 700°C

B. 2000°C

C. 1500°C

D. 1000°C

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4

Gas turbine as compared to steam turbine

A. Requires less space for installation

B. Has compressor and combustion chamber

C. Has less efficiency

D. All of these

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4

The closed cycle in gas turbines

A. Provides greater flexibility

B. Provides lesser flexibility

C. In never used

D. Is used when gas is to be burnt

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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

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

Work ratio of a gas turbine plant is ratio of

A. Net work output and work done by turbine

B. Net work output and heat supplied

C. Work done by turbine and heat supplied

D. Work done by turbine and net work output

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4

A rocket engine uses ________ for the combustion of its fuel.

A. Surrounding air

B. Compressed atmospheric air

C. Its own oxygen

D. None of these

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4

Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm. The air pressure will be

A. 1.03 kg/cm²

B. 1.06 kg/cm²

C. 1.00 kg/cm²

D. 0.53 kg/cm²

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4

Gas turbine works on

A. Brayton or Atkinson cycle

B. Carnot cycle

C. Rankine cycle

D. Erricson cycle

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4

Open cycle gas turbine works on

A. Brayton or Atkinson cycle

B. Rankine cycle

C. Carnot cycle

D. Erricson cycle

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4

The air-fuel ratio in gas turbines is of the order of

A. 7 : 1

B. 15 : 1

C. 30 : 1

D. 50 : 1.

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4

When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

A. Equal to

B. Less than

C. More than

D. None of these

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4

Free air is the air at

A. Atmospheric conditions at any specific location

B. 20°C and 1 kg/cm² and relative humidity of 36%

C. 0°C and standard atmospheric conditions

D. 15°C and 1 kg/cm²

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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

Reheating in multistage expansion gas turbine results in

A. High thermal efficiency

B. Reduction in compressor work

C. Decrease of heat loss in exhaust

D. Maximum work output

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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

In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

A. Vacuum

B. Atmospheric air

C. Compressed air

D. Oxygen alone

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4

The advantage of multistage compression over single stage compression is

A. Lower power consumption per unit of air delivered

B. Higher volumetric efficiency

C. Decreased discharge temperature

D. All of the above

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4

In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ________ of the piston.

A. One stroke

B. Two strokes

C. Three strokes

D. Four strokes

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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

The volumetric efficiency for reciprocating air compressors is about

A. 10 to 40 %

B. 40 to 60 %

C. 60 to 70 %

D. 70 to 90 %