Steam Nozzles and Turbines problems
- 1. The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
Options- A. remains the same
- B. increases
- C. decreases
- D. is unpredictable Discuss
Correct Answer: decreases
- 2. Steam turbines are used for
Options- A. large marine propulsion
- B. electric power generation
- C. direct drive of fans, compressors, pumps
- D. all of these Discuss
Correct Answer: all of these
- 3. De-Laval turbine is a
Options- A. single rotor impulse turbine
- B. multi-rotor impulse turbine
- C. impulse reaction turbine
- D. none of these Discuss
Correct Answer: single rotor impulse turbine
- 4. The steam leaves the nozzle at a
Options- A. high pressure and a low velocity
- B. high pressure and a high velocity
- C. low pressure and a low velocity
- D. low pressure and a high velocity Discuss
Correct Answer: low pressure and a high velocity
- 5. Parson's turbine is a
Options- A. simple impulse turbine
- B. simple reaction turbine
- C. impulse-reaction turbine
- D. none of these Discuss
Correct Answer: simple reaction turbine
- 6. In a convergent divergent nozzle, the discharge depends upon the initial conditions of steam and the area of nozzle at throat.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 7. The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
Options- A. remains same
- B. decreases
- C. increases Discuss
Correct Answer: increases
- 8. When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
Options- A. choked
- B. underdamping
- C. overdamping
- D. none of these Discuss
Correct Answer: underdamping
- 9. A nozzle is said to be a convergent nozzle
Options- A. when the cross-section of the nozzle increases continuously from entrance to exit
- B. when the cross-section of the nozzle decreases continuously from entrance to exit
- C. when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
- D. none of the above Discuss
Correct Answer: when the cross-section of the nozzle decreases continuously from entrance to exit
- 10. The critical pressure ratio for initially dry saturated steam is more as compared to initially wet steam.
Options- A. Yes
- B. No Discuss
Correct Answer: No
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