Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
The blade velocity coefficient is ratio of relative velocity of steam at outlet tip of the blade to the relative velocity of steam at inlet tip of the blade.
Options- A. True
- B. False
- Correct Answer
- True
- 1. In reaction turbines, the axial thrust is due to
Options- A. pressure drop across the rotor
- B. change in axial velocity
- C. both (a) and (b)
- D. none of these Discuss
- 2. Which of the following statement is correct?
Options- A. The expansion of steam in a nozzle follows Rankine cycle.
- B. The friction in the nozzle increases the dryness fraction of steam.
- C. The pressure of steam at throat is called critical pressure.
- D. all of the above Discuss
- 3. The steam enters the nozzle at a
Options- A. high pressure and a low velocity
- B. high pressure and a high velocity
- C. low pressure and a low velocity
- D. low pressure and a high velocity Discuss
- 4. The stage efficiency (?S) is given by (where ?B = Blading efficiency, and ?N = Nozzle efficiency)
Options- A. ?S = ?B x ?N
- B. ?S = ?B/?N
- C. ?S = ?N/?B
- D. none of these Discuss
- 5. The discharge is __________ at critical pressure.
Options- A. zero
- B. minimum
- C. maximum Discuss
- 6. Parson's reaction turbine is a __________ reaction turbine.
Options- A. 40 percent
- B. 50 percent
- C. 60 percent
- D. 70 percent Discuss
- 7. The efficiency of steam turbines may be improved by
Options- A. reheating of steam
- B. regenerative feed heating
- C. binary vapour plant
- D. any one of these Discuss
- 8. The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)
Options- A. V = 44.72 hd K
- B. V = 44.72 K hd
- C. V = 44.72 K hd
- D. V = 44.72 K hd Discuss
- 9. The pressure at which the steam leaves the nozzle is known as back pressure.
Options- A. Correct
- B. Incorrect Discuss
- 10. The difference of supersaturated temperature and saturation temperature at that pressure is called
Options- A. degree of supersaturation
- B. degree of superheat
- C. degree of undercooling
- D. none of these Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: both (a) and (b)
Correct Answer: all of the above
Correct Answer: high pressure and a low velocity
Correct Answer: ?S = ?B x ?N
Correct Answer: maximum
Correct Answer: 50 percent
Correct Answer: any one of these
Correct Answer: V = 44.72 K hd
Correct Answer: Correct
Correct Answer: degree of undercooling
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