261. Water is injected in gas turbine cycle to___________________?
A. control temperature
B. control output of turbine
C. control fire hazards
D. increase efficiency
E. it is never done

262. In the axial flow gas turbine, the work ratio is the ratio of____________________?
A. compressor work and turbine work
B. output and input
C. actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
D. actual compressor work and theoretical compressor work
E. none of the above

263. 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

264. In gas turbines^ high thermal efficiency is obtained in_________________?
A. closed cycle
B. open cycle
C. both of the above
D. closed/open depending on other con-side rations
E. unpredictable

265. In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of__________________?
A. vacuum
B. atmospheric air
C. compressed air
D. oxygen alone
E. liquid hydrogen

266. Turbo propeller has the following additional feature over the turbojet __________________?
A. propeller
B. diffuser
C. intercooler
D. turbine and combustion chamber
E. starting engine

267. In jet engines, paraffin is usually used as the fuel because of its _________________?
A. high calorific value
B. ease of atomization
C. low freezing point
D. A. and C. above
E. none of the above

268. 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

269. Intercooling in gas turbine results in ____________________ ?
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

270. The power available for take off and climb in case of turbojet engine as compared to reciprocating engine is ___________________?
A. less
B. more
C. same
D. may be less or more depending on ambient conditions
E. unpredictable

NOTE
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PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
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