115) 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

116) The material commonly used for air craft gas turbine is

117) It is not possible to use closed gas turbine cycle in aeronautical engines because

118) The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

119) The maximum combustion pressure in gas turbine as compared to I.C. engine is