Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
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
- Correct Answer
- pressure and velocity both decreases
- 1. The effect of friction in the nozzle __________ dryness fraction of steam.
Options- A. has no effect on
- B. decreases
- C. increases Discuss
- 2. 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
- 3. 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
- 4. The maximum efficiency of a De-Laval turbine is (where ? = Nozzle angle)
Options- A. sin2 ?
- B. cos2 ?
- C. tan2 ?
- D. cot2 ? Discuss
- 5. 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
- 6. 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
- 7. Stage efficiency is also known as
Options- A. diagram efficiency
- B. nozzle efficiency
- C. gross efficiency
- D. none of these Discuss
- 8. The correct mixture strength (by weight) for petrol is about
Options- A. 14.6:1
- B. 18.5:1
- C. 20.4:1
- D. 22.6:1 Discuss
- 9. A petrol engine, during suction stroke draws
Options- A. air only
- B. petrol only
- C. a mixture of petrol and air Discuss
- 10. A moderator
Options- A. absorbs neutrons
- B. does not absorb neutrons
- C. accelerates neutrons
- D. none of these Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: increases
Correct Answer: p2/p1
Correct Answer: pass out turbine
Correct Answer: cos2 ?
Correct Answer: heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
Correct Answer: very high
Correct Answer: gross efficiency
Correct Answer: 14.6:1
Correct Answer: a mixture of petrol and air
Correct Answer: does not absorb neutrons
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