It is not possible to use closed gas turbine cycle in aeronautical engines because_________________ ?

A. It is inefficient
B. It is bulky
C. It requires cooling water for its operation
D. Non of theses

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

The jnaximum combustion pressure in gas turbine as compared to I.C. engine is_________________?

A. More
B. Less
C. Same
D. Depends on other factors

The material commonly used for air craft gas turbine is__________________?

A. Stainless steel
B. High alloy’ steel
C. Duralumin
D. Timken, haste and inconel allpys

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

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

The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of________________?

A. 50%
B. 75%
C. 85%
D. 90%

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

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

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