Steam Nozzles and Turbines problems
- 1. The critical pressure ratio for initially dry saturated steam is
Options- A. 0.546
- B. 0.577
- C. 0.582
- D. 0.601 Discuss
Correct Answer: 0.577
- 2. 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
Correct Answer: True
- 3. 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
Correct Answer: governing
- 4. The maximum discharge of steam through a convergent-divergent nozzle depends upon
Options- A. area of nozzle at throat
- B. initial pressure and volume of steam
- C. final pressure ofsteam leaving the nozzle
- D. both (a) and (b) Discuss
Correct Answer: both (a) and (b)
- 5. The pressure of steam, in reaction turbines, is reduced in the fixed blades as well as in moving blades.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 6. The ratio of the energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam is called mechanical efficiency.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 7. The pressure of steam at throat of a steam nozzle is called critical pressure.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 8. The friction in the nozzle __________ exit velocity of steam.
Options- A. has no effect on
- B. decreases
- C. increases Discuss
Correct Answer: decreases
- 9. The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.
Options- A. same
- B. less
- C. more Discuss
Correct Answer: less
- 10. The pressure of steam __________ while flowing through a nozzle.
Options- A. increases
- B. decreases
- C. remains constant Discuss
Correct Answer: decreases
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