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Gas Turbines and Jet Engines

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

Compressors, Gas Turbines and Jet Engines /
As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?

A. increases
B. decreases
C. remains same
D. first increases and then decreases
E. first decreases and then increases

As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________? Read More »

Compressors, Gas Turbines and Jet Engines

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__________________?

Compressors, Gas Turbines and Jet Engines /
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. unpredictable
E. none of the above

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__________________? Read More »

Compressors, Gas Turbines and Jet Engines

Water gas is produced by ___________________ ?

Compressors, Gas Turbines and Jet Engines /
Water gas is produced by ___________________ ?

A. carbonisation of coal
B. passing steam over incandescent coke
C. passing air and a large amount of steam over waste coal at about 65°C
D. partial combustion of caol, eke, anthractie coal or charcoal in a mixed air steam blast
E. same way as the natural gas

Water gas is produced by ___________________ ? Read More »

Compressors, Gas Turbines and Jet Engines

The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?

Compressors, Gas Turbines and Jet Engines /
The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?

A. increases
B. decreases
C. first increases and then decreases
D. first decreases and then increases
E. remains same

The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________? Read More »

Compressors, Gas Turbines and Jet Engines

The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________?

Compressors, Gas Turbines and Jet Engines /
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________?

A. heated
B. compressed air before entering the combustion chamber is heated
C. bled gas from turbine is heated and readmitted for complete expansion
D. exhaust gases drive the compressor
E. part of exhaust gases are heated and mixed up with atmospheric air to utilise exhaust heat

The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________? Read More »

Compressors, Gas Turbines and Jet Engines