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Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
De-Laval turbines are mostly used
Options- A. where low speeds are required
- B. for small power purposes and low speeds
- C. for large power purposes
- D. for small power purposes and high speeds
- Correct Answer
- for small power purposes and high speeds
- 1. In order to reduce the rotor speed of an impulse turbine, the method employed is
Options- A. velocity compounding
- B. pressure compounding
- C. pressure-velocity compounding
- D. all of these Discuss
- 2. The velocity of steam, in reaction turbines, is increased in the fixed blades as well as in moving blades.
Options- A. True
- B. False Discuss
- 3. The diagram efficiency is the ratio of
Options- A. workdone on the blades to the energy supplied to the blades
- B. workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
- C. energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
- D. none of the above Discuss
- 4. Curtis turbine is a
Options- A. simple reaction turbine
- B. velocity compounded turbine
- C. pressure compounded turbine
- D. pressure-velocity compounded turbine Discuss
- 5. The flow of steam is super-sonic
Options- A. at the entrance to the nozzle
- B. at the throat of the nozzle
- C. in the convergent portion of the nozzle
- D. in the divergent portion of the nozzle Discuss
- 6. Blading efficiency is also known as
Options- A. stage efficiency
- B. diagram efficiency
- C. nozzle efficiency
- D. none of these Discuss
- 7. The Rankine efficiency depends upon total useful heat drop and total isentropic heat drop.
Options- A. Correct
- B. Incorrect Discuss
- 8. The critical pressure ratio for initially dry saturated steam is
Options- A. 0.546
- B. 0.577
- C. 0.582
- D. 0.601 Discuss
- 9. The ratio of the work delivered at the turbine shaft to the heat supplied is called overall thermal efficiency of turbine.
Options- A. True
- B. False Discuss
- 10. The process of maintaining the speed of the turbine constant for various load conditions, is known as
Options- A. bleeding
- B. reheating
- C. governing
- D. none of these Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: all of these
Correct Answer: True
Correct Answer: workdone on the blades to the energy supplied to the blades
Correct Answer: pressure-velocity compounded turbine
Correct Answer: in the divergent portion of the nozzle
Correct Answer: diagram efficiency
Correct Answer: Incorrect
Correct Answer: 0.577
Correct Answer: True
Correct Answer: governing
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