65) The critical pressure ratio for gases is

0.528

0.546

0.577

0.582

Answer is:

0.528

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66) The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

same

less

none of these

Answer is:

less

67) The effect of supersaturation is that the

mass of the steam discharged increases

entropy and specific volume of the steam increases

exit velocity of steam reduces

all of these

Answer is:

all of these

Explanation:

The effect of supersaturation is that the
* mass of the steam discharged increases
* entropy and specific volume of the steam increases
* entropy and specific volume of the steam increases

68) The effect of friction on the flow of steam through a nozzle is to

decrease the mass flow rate and to increase the wetness of steam

increase the mass flow rate and to increase the exit temperature

decrease the mass flow rate and to decrease the wetness of steam

increase the exit temperature without any effect on mass flow rate

Answer is:

decrease the mass flow rate and to decrease the wetness of steam

69) The ratio of the isentropic heat drop to the heat supplied, is called

reheat factor

stage efficiency

internal efficiency

Rankine efficiency

Answer is:

Rankine efficiency

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