Steam Nozzles and Turbines - Part 1 Online Exam Quiz
Steam Nozzles and Turbines - Part 1 GK Quiz. Question and Answers related to Steam Nozzles and Turbines - Part 1. MCQ (Multiple Choice Questions with answers about Steam Nozzles and Turbines - Part 1
A nozzle is said to be a convergent nozzle
Options
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
A turbine is said to have an axial discharge when the steam leaves the blade tip at __________ to the direction of the blade motion.
Options
A : 60°
B : 90°
C : 180°
D : 270°
The flow through a nozzle is regarded as
Options
A : constant volume flow
B : constant pressure flow
C : isothermal flow
D : isentropic flow
The ratio of total useful heat drop to the total isentropic heat drop, is called
Options
A : stage efficiency
B : internal efficiency
C : Rankine efficiency
D : none of these
The pressure at which the steam leaves the nozzle is known as back pressure.
Options
A : Correct
B : Incorrect
C : -
D : -
The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
Options
A : remains constant
B : decreases
C : increases
D : -
The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
Options
A : remains same
B : decreases
C : increases
D : -
The velocity of steam leaving the nozzle ( V ) is given by (where K = Nozzle coefficient or nozzle efficiency, and h d = Enthalpy or heat drop during expansion of steam in a nozzle)
Options
A : V = 44.72 h d K
B : V = 44.72 K h d
C : V = 44.72 K h d
D : V = 44.72 K h d
In a nozzle, whole frictional loss is assumed to occur between
Options
A : inlet and thoroat
B : inlet and outlet
C : throat and exit
D : all of these
The critical pressure ratio for initially wet steam is
Options
A : 0.546
B : 0.577
C : 0.582
D : 0.601
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