Steam Nozzles and Turbines problems
- 1. In a single stage impulse turbine, the velocity of steam approaching nozzles is negligible.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. 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
Correct Answer: Yes
- 3. 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
Correct Answer: each row of blades
- 4. 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
Correct Answer: when the cross-section of the nozzle increases continuously from entrance to exit
- 5. 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
Correct Answer: Rankine efficiency
- 6. 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
Correct Answer: all of these
- 7. 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
Correct Answer: Correct
- 8. 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
Correct Answer: decrease the mass flow rate and to decrease the wetness of steam
- 9. 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
Correct Answer: all of these
- 10. De-Laval turbine is a
Options- A. simple impulse turbine
- B. simple reaction turbine
- C. impulse-reaction turbine
- D. none of these Discuss
Correct Answer: simple impulse turbine
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