Steam Nozzles and Turbines Questions And Answers.


1.A nozzle is said to be a convergent nozzle
A. when the cross-section of the nozzle increases continuously from entrance to exit
B. when the cross-section of the nozzle decreases continuously from entrance to exit
C. when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
D. none of the above

2.A turbine is said to have an axial discharge when the steam leaves the blade tip at ____ to the direction of the blade motion.
A. 60
B. 90
C. 180
D. 270

3.The flow through a nozzle is regarded as
A. constant volume flow
B. constant pressure flow
C. isothermal flow
D. isentropic flow

4.The ratio of total useful heat drop to the total isentropic heat drop, is called
A. stage efficiency
B. internal efficiency
C. Rankine efficiency
D. none of these

5.The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
A. remains constant
B. decreases
C. increases
D. none of above

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