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4

In the cross compounding of the gas turbine plant

A. H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine

B. H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine

C. Both the arrangements can be employed

D. All are connected in series

Correct Answer :

B. H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine


Related Questions

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The compressor performance at higher altitude compared to sea level will be

A. Same

B. Higher

C. Lower

D. Dependent on other factors

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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

The air entry velocity m a rocket as compared to aircraft is

A. Same

B. More

C. Less

D. Zero

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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

The pressure and temperature conditions of air at the suction of compressor are

A. Atmospheric

B. Slightly more than atmospheric

C. Slightly less than atmospheric

D. Pressure slightly less than atmospheric and temperature slightly more than atmospheric

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4

A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.

A. Same

B. Lower

C. Higher

D. None of these

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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

The mass of gas turbine per kW developed is about ________ as that of an I.C. engine.

A. Same

B. One-half

C. One fourth

D. One sixth

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4

The thermal efficiency of a gas turbine as compared to a diesel plant is

A. Same

B. More

C. Less

D. Depends on other factors

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4

The degree of reaction is usually kept ________ for all types of axial flow compressors.

A. 0.2

B. 0.3

C. 0.4

D. 0.5

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4

The most efficient method of compressing air is to compress it

A. Isothermally

B. Adiabatically

C. Isentropically

D. Isochronically

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4

In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as

A. Work factor

B. Slip factor

C. Degree of reaction

D. Pressure coefficient

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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

In a jet engine, the air-fuel ratio is

A. 30 : 1

B. 40 : 1

C. 50 : 1

D. 60 : 1

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4

The pressure and temperature conditions of air at the suction of compressor are

A. Atmospheric

B. Slightly more than atmospheric

C. Slightly less than atmospheric

D. Pressure slightly less than atmospheric and temperature slightly more than atmospheric

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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 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 overall isothermal efficiency of compressor is defined as the ratio of

A. Isothermal h.p. to the BHP of motor

B. Isothermal h.p. to adiabatic h.p.

C. Power to drive compressor to isothermal h.p.

D. Work to compress air isothermally to work for actual compression

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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

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

The following property is most important for material used for gas turbine blade

A. Toughness

B. Fatigue

C. Creep

D. Corrosion resistance

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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

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

Efficiency of gas turbine is increased by

A. Reheating

B. Inter cooling

C. Adding a regenerator

D. All of the above

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4

Pressure ratio in gas turbines is the ratio of

A. Compressor pressure ratio

B. Highest pressure to exhaust pressure

C. Inlet pressure to exhaust pressure

D. Pressures across the turbine

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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

The inlet pressure is always ________ the discharge pressure.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The effective power of gas turbines is increased by adding the following in compressor

A. Ammonia and water vapour

B. Carbon dioxide

C. Nitrogen

D. Hydrogen

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4

The compressed air may be used

A. In gas turbine plants

B. For operating pneumatic drills

C. In starting and supercharging of I.C. engines

D. All of the above

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4

An ideal air compressor cycle with clearance on PV diagram can be represented by following processes

A. One adiabatic, two isobaric, and one constant volume

B. Two adiabatic and two isobaric

C. Two adiabatic, one isobaric and one constant volume

D. One adiabatic, one isobaric and two constant volumes