Which of the following statement is wrong?
A. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound
B. The flow in the convergent portion of the nozzle is subsonic
C. The flow in the divergent portion of the nozzle is supersonic
D. To increase the velocity of steam above sonic velocity (supersonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary
Answer: Option D
This Question Belongs to Mechanical Engineering >> Steam Boilers, Engines, Nozzles And Turbines
The expansion of steam in a nozzle follows
A. Carnot cycle
B. Rankine cycle
C. Joule cycle
D. Stirling cycle
A. Steam enters and exhausts through the same port
B. Steam enters at one end and exhausts at the centre
C. Steam enters at the centre and exhausts at the other end
D. None of the above
The mechanical draught _________ with the amount of smoke.
A. Increases
B. Decreases
C. Does not effect
D. None of these
A. Higher effectiveness of boiler
B. High calorific value coal being burnt
C. Fouling of heat transfer surfaces
D. Raising of steam temperature
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