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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

Correct Answer :

D. Decreases with increase in compression ratio


Related Questions

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4

The maximum propulsion efficiency of a turbojet is attained at around following speed

A. 550 km/hr

B. 1050 km/hr

C. 1700 km/hr

D. 2400 km/hr

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4

The gas in cooling chamber of a closed cycle gas turbine is cooled at

A. Constant volume

B. Constant temperature

C. Constant pressure

D. None of these

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4

Standard air is the air at

A. Atmospheric conditions at any specific location

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

C. 0°C and standard atmospheric conditions

D. 15°C and 1 kg/cm²

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4

Maximum delivery pressure is a rotary air compressor is of the order of

A. 6 kg/cm²

B. 10 kg/cm²

C. 16 kg/cm²

D. 25 kg/cm²

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4

Isothermal compression efficiency, even when running at high speed, can be approached by using

A. Multistage compression

B. Cold water spray

C. Both (A) and (B) above

D. Fully insulating the cylinder

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4

The net work input required for compressor with increase in clearance volume

A. Increases

B. Decreases

C. Remains same

D. Increases/decreases depending on compressor capacity

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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

The absolute pressure of air at the outlet of a compressor is called

A. Back pressure

B. Critical pressure

C. Discharge pressure

D. None of these

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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

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

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

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4

The ideal efficiency of simple gas turbine cycle depends on

A. Pressure ratio

B. Maximum cycle temperature

C. Minimum cycle temperature

D. All of the above

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4

The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is

A. Low

B. High

C. Same

D. Low/high depending on make and type

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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

The ratio of workdone per cycle to the stroke volume of the compressor is known as

A. Compressor capacity

B. Compression ratio

C. Compressor efficiency

D. Mean effective pressure

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4

During base load operation, the best method of controlling compressor is

A. Start-stop motor

B. Constant speed unloader

C. Relief valve

D. Variable speed

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4

To avoid moisture troubles, the compressed air main line should

A. Rise gradually towards the point of use

B. Drop gradually towards the point of use

C. Be laid vertically

D. Be laid exactly horizontally

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4

The work done per unit mass of air in compression will be least when n is equal to

A. 1

B. 1.2

C. 1.3

D. 1.4

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4

In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of workdone on the first and second stages (W₁/W₂) with perfect intercooling is given by

A. W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)

B. W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)

C. W₁/W₂ = n₁/n₂

D. W₁/W₂ = n₂/n₁

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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

The fuel consumption in gas turbines is accounted for by

A. Lower heating value

B. Higher heating value

C. Heating value

D. Higher calorific value

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4

In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to

A. N.T.P. conditions

B. Intake temperature and pressure conditions

C. 0°C and 1 kg/cm²

D. 20°C and 1 kg/cm²

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4

Reciprocating air compressor is best suited for

A. Large quantity of air at high pressure

B. Small quantity of air at high pressure

C. Small quantity of air at low pressure

D. Large quantity of air at low pressure

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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

Gas turbines for power generation are normally used

A. To supply base load requirements

B. To supply peak load requirements

C. To enable start thermal power plant

D. In emergency

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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

Ratio of compression is the ratio of

A. Gauge discharge pressure to the gauge intake pressure

B. Absolute discharge pressure to the absolute intake pressure

C. Pressures at discharge and suction corresponding to same temperature

D. Stroke volume and clearance volume

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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 velocity of air entering in a rocket is ________ as compared to an aircraft.

A. Zero

B. Less

C. More

D. Same

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4

An air compressor may be controlled by

A. Throttle control

B. Clearance control

C. Blow off control

D. Any one of the above