A. increase in net output but decrease in thermal efficiency
B. increase in thermal efficiency but decrease in net output
C. increase in both thermal efficiency and net output
D. decrease in both thermal efficiency and net output
E. none of the above
Related Mcqs:
- 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
E. unpredictable - 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 - 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 - 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 - If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?
A. isothermal
B. isentropic
C. adiabatic
D. isochoric
E. isobaric - The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?
A. same
B. higher
C. lower
D. uncomparable
E. unpredictable - Maximum temprature in a gas turbine is of the order of COMPRESSORS, GAS TURBINES AND JET ENGINES______________________?
A. 2500°C
B. 2000°C
C. 1500°C
D. 1000°C
E. 700°C - A closed gas turbine in which fuel is burnt directly in the air is not possible because of__________________?
A. high pressure ratio
B. increasing gas temperature
C. high specific volume
D. high friction losses
E. paucity of 02 - Work ratio of a gas turbine may be improved by f____________________?
A. decreasing the compression work
B. increasing the compression work
C. increasing the turbine work
D. decreasing the turbine work
E. A. and C. above - Reheating in multistage expansion gas turbine results in____________________?
A. high thermal efficiency
B. reduction in compressor work
C. decrease of heat loss in exhaust
D. maximum work output
E. none of the above
