Agree
Disagree
✅ The correct answer is option A.
Steam Nozzles and Turbines MCQs
The ratio of the work delivered at the turbine shaft to the heat supplied is called overall thermal efficiency of turbine.
TRUE
FALSE
✅ The correct answer is option A.
When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.
increases
decreases
✅ The correct answer is option B.
The expansion of steam, as it flows over the blades in reaction turbine, represents
isothermal process
isentropic process
throttling process
free-expansion process
✅ The correct answer is option B.
Blading efficiency is also known as
stage efficiency
diagram efficiency
nozzle efficiency
none of these
✅ The correct answer is option B.
The effect of friction in the nozzle __________ dryness fraction of steam.
has no effect on
decreases
increases
✅ The correct answer is option C.
In a single stage impulse turbine, the velocity of steam approaching nozzles is negligible.
TRUE
FALSE
✅ The correct answer is option A.
The velocity of steam at throat of the nozzle is __________ the velocity of sound.
equal to
less than
more than
✅ The correct answer is option A.
The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.
Agree
Disagree
✅ The correct answer is option A.
De-Laval turbine is a
simple impulse turbine
simple reaction turbine
impulse-reaction turbine
none of these
✅ The correct answer is option A.