Top 50+ Solved Steam Prime-Movers MCQ Questions Answer
Q. Steam nozzle converts
a. heat energy of steam into pressure energy
b. heat energy of steam into kinetic energy
c. pressure energy of steam into heat energy
d. pressure energy of steam into potential energy
Q. A nozzle is designed for
a. maximum pressure at the outlet
b. maximum discharge
c. maximum pressure and maximum discharge
d. maximum kinetic energy at the outlet
Q. Ideal expansion of steam through a nozzle is considered
a. isothermal
b. adiabatic
c. polytropic
d. none of the above
Q. Presence of frictional effect during flow through the nozzle
a. reduces the exit velocity
b. increases the exit velocity
c. has no effect on exit velocity
d. none of the above
Q. Frictional losses in the nozzle
a. reduces the heat drop
b. increases the heat drop
c. has no effect on heat drop
d. none of the above
Q. While steam expands in turbines, theoretically the entropy
a. remains constant
b. increases
c. decreases
d. behaves unpredictably
Q. Nozzle efficiency is defined as
a. ratio of isentropic heat drop to useful heat drop
b. ratio of useful heat drop to isentropic heat drop
c. product of useful heat drop and isentropic heat drop
d. none of the above
Q. When a nozzle operates with maximum mass flow, it is said to be
a. under expanding flow
b. over expanding flow
c. choked flow
d. none of the above
Q. For supersaturated flow in the nozzle, the discharge
a. increases
b. decreases
c. remains constant
d. none of the above
Q. For the flow through the convergent and divergent nozzle, whole of friction loss is assumed
a. in the converging portion
b. in the divergent portion
c. between inlet and outlet
d. none of the above
Q. The presence of friction in the nozzle
a. increases the final dryness fraction of steam
b. decreases the final dryness fraction of steam
c. it does not affect the dryness fraction of steam
d. none of the above
Q. When the back pressure of a nozzle is below the critical pressure, the nozzle is said to be
a. under expanding flow
b. over expanding flow
c. choked flow
d. none of the above
Q. Which ideal process is carried out at the turbine in vapour power cycle?
a. reversible adiabatic compression
b. reversible adiabatic expansion
c. reversible constant pressure heat addition
d. reversible constant pressure heat rejection
Q. The steam turbines is a
a. rotary machine
b. reciprocating machine
c. rotodynamic machine
d. none of the above
Q. From inlet to exit of steam nozzle, the pressure
a. increases
b. decreases
c. remains constant
d. none of the above