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4

What will be the volume of air at 327°C if its volume at 27°C is 1.5 m³/ mt?

A. 3 m³/ mt.

B. 1.5 m³/ mt.

C. 18 m³/ mt.

D. 6 m³/ mt.

Correct Answer :

A. 3 m³/ mt.


Related Questions

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The main purpose of reheating in gas turbine is to

A. Increase temperature

B. Reduce turbine size

C. Increase power output

D. Increase speed

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4

The efficiency of a jet engine is higher at

A. Low speeds

B. High speeds

C. Low altitudes

D. High altitudes

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4

Fighter bombers use following type of engine

A. Turbojet

B. Turbo-propeller

C. Rocket

D. Ramjet

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4

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

A. Isothermal compression

B. Isentropic compression

C. Polytropic compression

D. None of these

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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

Work ratio of a gas turbine may be improved by

A. Decreasing the compression work

B. Increasing the compression work

C. Increasing the turbine work

D. Both (A) and (C) above

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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

Pick up the wrong statement

A. Pulsejet requires no ambient air for propulsion

B. Ramjet engine has no turbine

C. Turbine drives compressor in a Turbojet

D. Bypass turbojet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy

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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

In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

A. Diffuser inlet radius

B. Diffuser outlet radius

C. Impeller inlet radius

D. Impeller outlet radius

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4

The efficiency and work ratio of a gas turbine plant can be increased by

A. Adding heat exchanger

B. Injecting water in/around combustion chamber

C. Reheating the air after partial expansion in the turbine

D. All of the above

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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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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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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

Maximum work is done in compressing air when the compression is

A. Isothermal

B. Adiabatic

C. Polytropic

D. None of the above

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4

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

Volumetric efficiency is

A. The ratio of stroke volume to clearance volume

B. The ratio of the air actually delivered to the amount of piston displacement

C. Reciprocal of compression ratio

D. Index of compressor performance

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4

The work ratio 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

An aftercooler is used to

A. Remove impurities from air

B. Reduce volume of air

C. Cause moisture and oil vapour to drop out

D. Cool the air

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4

Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

A. Less power requirement

B. Better mechanical balance

C. Less loss of air due to leakage past the cylinder

D. Lower volumetric efficiency

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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

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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For minimum work required to compress and deliver a quantity of air by multistage compression

A. The compression ratio in each stage should be same

B. The intercooling should be perfect

C. The workdone in each stage should be same

D. All of the above

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4

The material commonly used for air craft gas turbine is

A. Stainless steel

B. High alloy steel

C. Duralumin

D. Timken, Haste alloys

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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 work done per cycle to the swept volume in case of compressor is called

A. Compression index

B. Compression ratio

C. Compressor efficiency

D. Mean effective pressure

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4

What will be the volume of air at 327°C if its volume at 27°C is 1.5 m³/ mt?

A. 3 m³/ mt.

B. 1.5 m³/ mt.

C. 18 m³/ mt.

D. 6 m³/ mt.

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4

Ramjet engine

A. Is self operating at zero flight speed

B. Is not self operating at zero flight speed

C. Requires no air for its operation

D. Produces a jet consisting of plasma

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4

A closed gas turbine in which fuel is burnt directly in the air is not possible because of

A. Paucity of O2

B. Increasing gas temperature

C. High specific volume

D. High friction losses

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Ratio of indicated H.P. and brake H.P. is known as

A. Mechanical efficiency

B. Volumetric efficiency

C. Isothermal efficiency

D. Adiabatic efficiency