Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.
Options- A. increases
- B. decreases
- Correct Answer
- decreases
- 1. For a Parson's reaction turbine, if ?1 and ?2 are fixed blade angles at inlet and exit respectively and ?1 and ?2 are the moving blade angles at entrance and exit respectively, then
Options- A. ?1 = ?2 and ?1 = ?2
- B. ?1 = ?1 and ?2 = ?2
- C. ?1 < ?1 and ?2 > ?2
- D. ?1 = ?2 and ?1 = ?2 Discuss
- 2. In a nozzle, the effect of supersaturation is to
Options- A. decrease dryness fraction of steam
- B. decrease specific volume of steam
- C. increase the entropy
- D. increase the heat drop Discuss
- 3. In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.
Options- A. Yes
- B. No Discuss
- 4. Steam turbines may be classified according to
Options- A. direction of steam flow
- B. number of stages
- C. mode of steam action
- D. all of these Discuss
- 5. Which of the following statement is correct?
Options- A. The efficiency of steam turbines is greater than steam engines.
- B. A flywheel is a must for steam turbine.
- C. The turbine blades do not change the direction of steam issuing from the nozzle
- D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades Discuss
- 6. The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and ? = Nozzle angle)
Options- A. Vb = 0.5 V cos ?
- B. Vb = V cos ?
- C. Vb = 0.5 V2 cos ?
- D. Vb = V2 cos? Discuss
- 7. The expansion of steam in a nozzle follows
Options- A. Carnot cycle
- B. Rankine cycle
- C. Joule cycle
- D. Stirling cycle Discuss
- 8. In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be
Options- A. 260 kW
- B. 282 kW
- C. 296 kW
- D. 302 kW Discuss
- 9. 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
- 10. The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
Options- A. same
- B. less
- C. more Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: ?1 = ?2 and ?1 = ?2
Correct Answer: increase the entropy
Correct Answer: Yes
Correct Answer: all of these
Correct Answer: The efficiency of steam turbines is greater than steam engines.
Correct Answer: Vb = 0.5 V cos ?
Correct Answer: Rankine cycle
Correct Answer: 282 kW
Correct Answer: False
Correct Answer: more
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