Steam Nozzles and Turbines problems
- 1. The stage efficiency is the ratio of energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam.
Options- A. True
- B. False Discuss
Correct Answer: False
- 2. The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
Options- A. same
- B. less
- C. more Discuss
Correct Answer: more
- 3. When the inlet pressure of steam is equal to the exit pressure, then
Options- A. there is a pressure drop in the nozzle
- B. fluid flows through the nozzle
- C. pressure drops and fluid flows through the nozzle
- D. there is no pressure drop and fluid does not flow through the nozzle Discuss
Correct Answer: there is no pressure drop and fluid does not flow through the nozzle
- 4. In an impulse reaction turbine, the pressure drops gradually and continuously over
Options- A. fixed blades
- B. moving blades
- C. both fixed and moving blades
- D. none of these Discuss
Correct Answer: both fixed and moving blades
- 5. The expansion of steam, as it flows over the blades in reaction turbine, represents
Options- A. isothermal process
- B. isentropic process
- C. throttling process
- D. free-expansion process Discuss
Correct Answer: isentropic process
- 6. In pressure compounding of an impulse turbine, the total pressure drop of the steam does not take place in the first nozzle ring, but is divided equally among all the nozzle rings.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 7. 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
Correct Answer: bleeding
- 8. 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
Correct Answer: more
- 9. The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.
Options- A. more
- B. less Discuss
Correct Answer: less
- 10. 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
Correct Answer: 10 to 15%
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