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Which of the following statement is correct?

A. The reciprocating compressors are best suited for high pressure and low volume capacity

B. The effect of clearance volume on power consumption is negligible for the same volume of discharge

C. Both (A) and (B)

D. None of these

Correct Answer :

C. Both (A) and (B)


Related Questions

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After-cooler is used to

A. Cool the air

B. Decrease the delivery temperature for ease in handling

C. Cause moisture and oil vapour to drop out

D. Reduce volume

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

A. Equal to

B. Less than

C. More than

D. None of these

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The capacity of a compressor is 5 m /min refers to

A. Standard air

B. Free air

C. Compressed air

D. Compressed air at delivery pressure

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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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Phenomenon of choking in compressor means

A. No flow of air

B. Fixed mass flow rate regardless of pressure ratio

C. Reducing mass flow rate with increase in pressure ratio

D. Increased inclination of chord with air steam

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4

The indicated work per unit mass of air delivered is

A. Directly proportional to clearance volume

B. Greatly affected by clearance volume

C. Not affected by clearance volume

D. Inversely proportional to clearance volume

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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

A rocket engine for the combustion of its fuel

A. Carries its own oxygen

B. Uses surrounding air

C. Uses compressed atmospheric air

D. Does not require oxygen

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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

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

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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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

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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The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as

A. Compressor efficiency

B. Volumetric efficiency

C. Isothermal efficiency

D. Mechanical efficiency

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4

As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio

A. Increases

B. Decreases

C. Remain same

D. First increases and then decreases

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Gas turbines use following type of air compressor

A. Centrifugal type

B. Reciprocating type

C. Lobe type

D. Axial flow type

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Standard air is the air at ________ and relative humidity of 36 percent.

A. 0.1 bar and 20°C

B. 1 bar and 20°C

C. 0.1 bar and 40°C

D. 1 bar and 40°C

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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

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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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The overall isothermal efficiency of the compressor is defined as the ratio of

A. Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio

B. Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor

C. Volume of free air delivery per stroke to the swept volume of the piston

D. Isentropic power to the power required to drive the compressor

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4

In the axial flow gas turbine, the work ratio is the ratio of

A. Compressor work and turbine work

B. Output and input

C. Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet

D. Actual compressor work and theoretical compressor work

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4

The blades of gas turbine are made of

A. High nickel alloy

B. Stainless steel

C. Carbon steel

D. High alloy steel

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The overall efficiency of the compressed air system is the

A. Ratio of shaft output of the air motor to the shaft input to the compressor

B. Ratio of shaft input to the compressor to the shaft output of air motor

C. Product of shaft output of air motor and shaft input to the compressor

D. None of the above

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4

The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

A. r -1

B. 1 - r -1

C. 1 - (1/r) -1/

D. 1 - (1/r) /-1

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Propulsion efficiency of the following order is obtained in practice

A. 34 %

B. 50 %

C. 60 %

D. 72 %

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If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

A. 1 - k + k (p₁/p₂)1/n

B. 1 + k - k (p₂/p₁)1/n

C. 1 - k + k (p₁/p₂) n- 1/n

D. 1 + k - k (p₂/p₁) n-1/n

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The most efficient method of compressing air is to compress it

A. Isothermally

B. Adiabatically

C. Isentropically

D. Isochronically

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The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

A. Compressor efficiency

B. Volumetric efficiency

C. Isothermal efficiency

D. Mechanical efficiency

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4

Diffuser in a compressor is used to

A. Increase velocity

B. Make the flow streamline

C. Convert pressure energy into kinetic energy

D. Convert kinetic energy into pressure energy

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Which of the following plants is smallest and lightest for generating a given amount of power?

A. Gas turbine plant

B. Petrol engine

C. Diesel engine

D. Solar plant