velocity compounded type
reaction type
pressure compounded type
all of these
✅ The correct answer is option D.
Steam Nozzles and Turbines MCQs
112. Which of the following statement is correct?
The expansion of steam in a nozzle follows Rankine cycle.
The friction in the nozzle increases the dryness fraction of steam.
The pressure of steam at throat is called critical pressure.
all of the above
✅ The correct answer is option D.
113. De-Laval turbine is a
single rotor impulse turbine
multi-rotor impulse turbine
impulse reaction turbine
none of these
✅ The correct answer is option A.
114. The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
0.4
0.56
0.67
1.67
✅ The correct answer is option A.
115. The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
remains same
decreases
increases
✅ The correct answer is option C.
116. The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)
[A]. ηS = ηB x ηN
[B]. ηS = ηB/ηN
[C]. ηS = ηN/ηB
[D]. none of these
✅ The correct answer is option A.
117. The action of steam in a steam turbine is
[A]. static
[B]. dynamic
[C]. static and dynamic
[D]. neither static nor dynamic
✅ The correct answer is option B.
118. The Parsons’ reaction turbine has
[A]. only moving blades
[B]. only fixed blades
[C]. identical fixed and moving blades
[D]. fixed and moving blades of different shape
✅ The correct answer is option C.
119. Thermal equilibrium means that the flow of steam is
[A]. isothermal
[B]. isentropic
[C]. hyperbolic
[D]. polytropic
✅ The correct answer is option B.
120. A binary vapour plant consists of
[A]. steam turbine
[B]. steam condenser
[C]. mercury boiler
[D]. all of these
✅ The correct answer is option D.