Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
For maximum efficiency of an impulse turbine, the steam should leave the blades at right angles to their motion.
Options- A. Correct
- B. Incorrect
- Correct Answer
- Correct
- 1. 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
- 2. The ratio of the isentropic heat drop to the heat supplied, is called
Options- A. reheat factor
- B. stage efficiency
- C. internal efficiency
- D. Rankine efficiency Discuss
- 3. A nozzle is said to be a divergent 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
- 4. A stage, in reaction turbine, is represented by
Options- A. number of casing
- B. number of entries of steam
- C. number of exits of steam
- D. each row of blades Discuss
- 5. When the cross-section of a nozzle first increases from its entrance to throat, and then decreases from its throat to exit, it is not a convergent-divergent nozzle.
Options- A. Yes
- B. No Discuss
- 6. 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
- 7. 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
- 8. De-Laval turbine is a
Options- A. simple impulse turbine
- B. simple reaction turbine
- C. impulse-reaction turbine
- D. none of these Discuss
- 9. The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ number of stages are required.
Options- A. more
- B. less Discuss
- 10. 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
Steam Nozzles and Turbines problems
Search Results
Correct Answer: all of these
Correct Answer: Rankine efficiency
Correct Answer: when the cross-section of the nozzle increases continuously from entrance to exit
Correct Answer: each row of blades
Correct Answer: Yes
Correct Answer: decrease the mass flow rate and to decrease the wetness of steam
Correct Answer: all of these
Correct Answer: simple impulse turbine
Correct Answer: less
Correct Answer: True
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