101. The efficiency of steam turbines may be improved by
reheating of steam
regenerative feed heating
binary vapour plant
any one of these
✅ The correct answer is option D.
Steam Nozzles and Turbines MCQs
102. Parson’s turbine is a
simple impulse turbine
simple reaction turbine
impulse-reaction turbine
none of these
✅ The correct answer is option B.
103. The steam leaves the nozzle at a
high pressure and a low velocity
high pressure and a high velocity
low pressure and a low velocity
low pressure and a high velocity
✅ The correct answer is option D.
104. The impulse reaction turbine has its driving force
as an impulsive force
as a reaction force
partly as an impulsive force and partly as a reaction force
none of the above
✅ The correct answer is option C.
105. The value of the reheat factor varies from
1.02 to 1.06
1.08 to 1.l0
1.2 to 1.6
1.6 to 2
✅ The correct answer is option A.
107. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
Agree
Disagree
✅ The correct answer is option A.
108. In reaction turbines, the axial thrust is due to
pressure drop across the rotor
change in axial velocity
both (a) and (b)
none of these
✅ The correct answer is option C.
109. The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
remains constant
decreases
increases
✅ The correct answer is option A.
110. The steam enters the nozzle at a
high pressure and a low velocity
high pressure and a high velocity
low pressure and a low velocity
low pressure and a high velocity
✅ The correct answer is option A.