Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
The maximum efficiency of a De-Laval turbine is (where ? = Nozzle angle)
Options- A. sin2 ?
- B. cos2 ?
- C. tan2 ?
- D. cot2 ?
- Correct Answer
- cos2 ?
- 1. 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
- 2. 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
- 3. 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
- 4. 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 Discuss
- 5. The velocity of whirl at outlet for an axial discharge turbine is
Options- A. minimum
- B. maximum
- C. zero Discuss
- 6. 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
- 7. The critical pressure ratio is given by (where p1 = Initial pressure of steam, and p2 = Pressure of steam at throat or critical pressure)
Options- A. p1 p2
- B. p1/p2
- C. p2/p1
- D. p1 + p2 Discuss
- 8. The effect of friction in the nozzle __________ dryness fraction of steam.
Options- A. has no effect on
- B. decreases
- C. increases Discuss
- 9. In a reaction turbine, when steam flows through the moving blades,
Options- A. pressure increases while velocity decreases
- B. pressure decreases while velocity increases
- C. pressure and velocity both decreases
- D. pressure and velocity both increases Discuss
- 10. In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is
Options- A. low
- B. very low
- C. high
- D. very high Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
Correct Answer: no heat drop in moving blades
Correct Answer: 10 to 15 percent
Correct Answer: equal to
Correct Answer: zero
Correct Answer: pass out turbine
Correct Answer: p2/p1
Correct Answer: increases
Correct Answer: pressure and velocity both decreases
Correct Answer: very high
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