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4

A 3 m³/min compressor means that it

A. Compresses 3 m³/min of standard air

B. Compresses 3 m³/ min of free air

C. Delivers 3 m³/ min of compressed air

D. Delivers 3 m³/ min of compressed air at delivery pressure

Correct Answer :

B. Compresses 3 m³/ min of free air


Related Questions

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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

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

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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

Intercooling in gas turbines

A. Decreases net output but increases thermal efficiency

B. Increases net output but decreases thermal efficiency

C. Decreases net output and thermal efficiency both

D. Increases net output and thermal efficiency both

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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

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 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

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

A compressor mostly used for supercharging of I.C. engines is

A. Radial flow compressor

B. Axial flow compressor

C. Roots blower

D. Reciprocating compressor

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4

If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches

A. Isothermal

B. Isentropic

C. Adiabatic

D. Isochoric

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4

Ratio of indicated h.p. to shaft h.p. in known as

A. Compressor efficiency

B. Isothermal efficiency

C. Volumetric efficiency

D. Mechanical efficiency

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4

In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone is minimum during

A. Isothermal compression

B. Isentropic compression

C. Polytropic compression

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 jet engines the products of combustion after passing through the gas turbine are discharged into

A. Atmosphere

B. Back to the compressor

C. Discharge nozzle

D. Vacuum

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4

Axial flow compressor resembles

A. Centrifugal pump

B. Reciprocating pump

C. Turbine

D. Sliding vane compressor

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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

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 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 volumetric efficiency of a compressor

A. Increases with decrease in compression ratio

B. Decreases with decrease in compression ratio

C. Increases with increase in compression ratio

D. Decreases with increase in compression ratio

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4

Which one of the following is the effect of blade shape on performance of a centrifugal compressor?

A. Backward curved blades has poor efficiency

B. Backward curved blades lead to stable performance

C. Forward curved blades has higher efficiency

D. Forward curved blades produce lower pressure ratio

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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

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

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

A large clearance volume in a reciprocating compressor results in

A. Reduced volume flow rate

B. Increased volume flow rate

C. Lower suction pressure

D. Lower delivery pressure

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4

Which is false statement about multistage compression?

A. Power consumption per unit of air delivered is low

B. Volumetric efficiency is high

C. It is best suited for compression ratios around 7:1

D. The moisture in air is condensed in the intercooler

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4

A gas turbine used in air craft should have

A. High h.p. and low weight

B. Low weight and small frontal area

C. Small frontal area and high h.p.

D. High speed and high h.p

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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

Pick up the correct statement

A. Large gas turbines use radial inflow turbines

B. Gas turbines have their blades similar to steam turbine

C. Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip

D. Gas turbines use both air and liquid cooling

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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

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