Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is __________ the relative velocity of steam at inlet tip of the blade.
Options- A. equal to
- B. less than
- C. greater than
- Correct Answer
- equal to
- 1. The velocity of whirl at outlet for an axial discharge turbine is
Options- A. minimum
- B. maximum
- C. zero Discuss
- 2. The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.
Options- A. 10 to 15%
- B. 15 to 20%
- C. 20 to 30%
- D. 30 to 40% Discuss
- 3. The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.
Options- A. more
- B. less Discuss
- 4. An impulse turbine as compared to a reaction turbine, for a given power has __________ row of blades.
Options- A. equal
- B. less
- C. more Discuss
- 5. The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
Options- A. regenerative heating
- B. reheating of steam
- C. bleeding
- D. none of these Discuss
- 6. The friction present between the steam and the nozzle surfaces reduces the heat drop by
Options- A. 10 to 15 percent
- B. 15 to 25 percent
- C. 25 to 40 percent
- D. 40 to 60 percent Discuss
- 7. In a reaction turbine when the degree of reaction is zero, then there is
Options- A. no heat drop in moving blades
- B. no heat drop in fixed blades
- C. maximum heat drop in moving blades
- D. maximum heat drop in fixed blades Discuss
- 8. Degree of reaction is defined as the ratio of
Options- A. heat drop in fixed blades to the heat drop in moving blades
- B. heat drop in moving blades to the heat drop in fixed blades
- C. heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
- D. heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades Discuss
- 9. The maximum efficiency of a De-Laval turbine is (where ? = Nozzle angle)
Options- A. sin2 ?
- B. cos2 ?
- C. tan2 ?
- D. cot2 ? Discuss
- 10. A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
Options- A. back pressure turbine
- B. pass out turbine
- C. low pressure turbine
- D. impulse turbine Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: zero
Correct Answer: 10 to 15%
Correct Answer: less
Correct Answer: more
Correct Answer: bleeding
Correct Answer: 10 to 15 percent
Correct Answer: no heat drop in moving blades
Correct Answer: heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
Correct Answer: cos2 ?
Correct Answer: pass out turbine
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