11. De-Laval turbine is a
simple impulse turbine
simple reaction turbine
impulse-reaction turbine
none of these
✅ The correct answer is option A.
Steam Nozzles and Turbines MCQs
12. 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.
13. 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.
14. In a single stage impulse turbine, the velocity of steam approaching nozzles is negligible.
TRUE
FALSE
✅ The correct answer is option A.
15. The effect of friction in the nozzle __________ dryness fraction of steam.
has no effect on
decreases
increases
✅ The correct answer is option C.
16. Blading efficiency is also known as
stage efficiency
diagram efficiency
nozzle efficiency
none of these
✅ The correct answer is option B.
17. 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.
18. The friction in the nozzle __________ exit velocity of steam.
has no effect on
decreases
increases
✅ The correct answer is option B.
19. The efficiency ratio is the ratio of total useful heat drop to the total isentropic heat drop.
Agree
Disagree
✅ The correct answer is option A.
20. 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.