### Objective Type Questions on Boiler and Auxiliaries

**(Answers are marked inred color)**

(1)The critical pressure ratio of a convergent nozzle is defined as a)The ratio of outlet pressure to inlet pressure of nozzle b)The ratio of inlet pressure to outlet pressure of nozzle c)The ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimum d)The ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is maximum

(2)The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation a)PV= C b)P