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4

The air is delivered ________ in one revolution in case of a three lobbed rotor.

A. Two times

B. Three times

C. Four times

D. Six times

Correct Answer :

D. Six times


Related Questions

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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

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

The efficiency of jet engine is

A. Lower at low speed

B. Higher at high altitudes

C. Same at all altitudes

D. Higher at high speed

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4

The reason for volumetric efficiency of reciprocating compressor being less than 100 percent is

A. Pressure drop across the valves

B. Superheating in compressor

C. Clearance volume and leakages

D. All of these

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4

The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called

A. Pressure ratio

B. Pressure coefficient

C. Degree of reaction

D. Slip factor

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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 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

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4

For minimum work in multistage compression, assuming same index of compression in all stages

A. Work done in first stage should be more

B. Work done in subsequent stages should increase

C. Work done in subsequent stages should decrease

D. Work done in all stages should be equal

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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

Choose the correct statement

A. Gas turbine requires lot of cooling water

B. Gas turbine is capable of rapid start up and loading

C. Gas turbines has flat efficiency at part loads

D. Gas turbines have high standby losses and require lot of maintenance

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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

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

A compressor at high altitudes will require ________ power.

A. Same

B. Less

C. More

D. None of these

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4

With the decrease in compression ratio, the volumetric efficiency

A. Does not change

B. Increases

C. Decreases

D. First decrease and then increase

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4

In air compressors, free air delivery means 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

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

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 working fluid in a turbine is

A. In two phases

B. In three phases

C. In a single phase

D. In the form of air and water mixture

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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

Compression efficiency is compared against

A. Ideal compression

B. Adiabatic compression

C. Isentropic compression

D. Isothermal compression

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4

In the aircraft propellers

A. The propulsive matter is caused to flow around the propelled body

B. Propulsive matter is ejected from within the propelled body

C. Its functioning does not depend on presence of air

D. All of the above

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4

Inter-cooling in multistage compressors is done

A. To cool the air during compression

B. To cool the air at delivery

C. To enable compression in two stages

D. To minimise the work of compression

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4

The ratio of isentropic work to Euler work is known as

A. Pressure coefficient

B. Work coefficient

C. Polytropic reaction

D. Slip factor

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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

Which of the following statement is wrong?

A. In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.

B. The minimum work required for a two stage reciprocating air compressor is double the work required for each stage.

C. The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.

D. None of the above

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4

High air-fuel ratio is used in gas turbines

A. To increase the output

B. To increase the efficiency

C. To save fuel

D. To reduce the exit temperature

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4

In a closed cycle gas turbine, the air is compressed

A. Isothermally

B. Polytropically

C. Isentropically

D. None of these

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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 area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is

A. Less

B. More

C. Same

D. More/less depending on compressor capacity

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4

Volumetric efficiency of a compressor without clearance volume

A. Increases with increase in compression ratio

B. Decreases with increase in compression ratio

C. Is not dependent upon compression ratio

D. May increase/decrease depending on compressor capacity