Inter-cooling in gas turbine results in

When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, 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

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

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

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

The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

A

Delivers unit discharge under unit head

B

Delivers unit discharge under unit speed

C

Develops unit power under unit head

D

Develops unit power under unit speed

For perfect intercooling in a three stage compressor

A

$$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_3}}}{{{{\text{p}}_2}}} = \frac{{{{\text{p}}_4}}}{{{{\text{p}}_3}}}$$

B

$$\frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_4}}}{{{{\text{p}}_2}}}$$

C

$${{\text{p}}_1}{{\text{p}}_2} = {{\text{p}}_3}{{\text{p}}_4}$$

D

$${{\text{p}}_1}{{\text{p}}_3} = {{\text{p}}_2}{{\text{p}}_4}$$

For perfect intercooling in a two stage compressor

A

$$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_3}}}{{{{\text{p}}_2}}}$$

B

$$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_3}}} = \frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}$$

C

$${{\text{p}}_1} = {{\text{p}}_3}$$

D

$${{\text{p}}_1} = {{\text{p}}_2}{{\text{p}}_3}$$

The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?

A

39

B

78

C

117

D

156

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

A

Remain same

B

Decrease

C

Increase

D

None of the above

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

Inter-cooling in gas turbine results in

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