Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ number of stages are required.
Options- A. more
- B. less
- Correct Answer
- less
- 1. De-Laval turbine is a
Options- A. simple impulse turbine
- B. simple reaction turbine
- C. impulse-reaction turbine
- D. none of these Discuss
- 2. The effect of supersaturation is that the
Options- A. mass of the steam discharged increases
- B. entropy and specific volume of the steam increases
- C. exit velocity of steam reduces
- D. all of these Discuss
- 3. The effect of friction on the flow of steam through a nozzle is to
Options- A. decrease the mass flow rate and to increase the wetness of steam
- B. increase the mass flow rate and to increase the exit temperature
- C. decrease the mass flow rate and to decrease the wetness of steam
- D. increase the exit temperature without any effect on mass flow rate Discuss
- 4. For maximum efficiency of an impulse turbine, the steam should leave the blades at right angles to their motion.
Options- A. Correct
- B. Incorrect Discuss
- 5. Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?
Options- A. A steam turbine develops higher speeds
- B. The efficiency of steam turbine is higher
- C. The steam consumption is less
- D. all of these Discuss
- 6. In velocity compounding of an impulse turbine, the expansion of steam takes place in a nozzle or a set of nozzles from the boiler pressure to condenser pressure.
Options- A. True
- B. False Discuss
- 7. If the critical pressure ratio for steam is 0.546, then the steam is initially
Options- A. wet steam
- B. dry saturated steam
- C. superheated steam
- D. none of these Discuss
- 8. In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be
Options- A. 160/3 m/s
- B. 320/3 m/s
- C. 640/3 m/s
- D. 640 m/s Discuss
- 9. In an impulse turbine, steam expands
Options- A. wholly in blades
- B. wholly in nozzle
- C. partly in the nozzle and partly in blades
- D. none of these Discuss
- 10. A nozzle is said to be a convergent-divergent nozzle, when the cross-section of a nozzle first decreases from its entrance to throat and then increases from its throat to exit.
Options- A. True
- B. False Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: simple impulse turbine
Correct Answer: all of these
Correct Answer: decrease the mass flow rate and to decrease the wetness of steam
Correct Answer: Correct
Correct Answer: all of these
Correct Answer: True
Correct Answer: superheated steam
Correct Answer: 640/3 m/s
Correct Answer: wholly in nozzle
Correct Answer: True
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