Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
The expansion of steam in a nozzle follows
Options- A. Carnot cycle
- B. Rankine cycle
- C. Joule cycle
- D. Stirling cycle
- Correct Answer
- Rankine cycle
- 1. 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
- 2. When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.
Options- A. increases
- B. decreases Discuss
- 3. 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
- 4. 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
- 5. In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.
Options- A. Yes
- B. No Discuss
- 6. 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
- 7. 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
- 8. The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
Options- A. same
- B. less
- C. more Discuss
- 9. When the inlet pressure of steam is equal to the exit pressure, then
Options- A. there is a pressure drop in the nozzle
- B. fluid flows through the nozzle
- C. pressure drops and fluid flows through the nozzle
- D. there is no pressure drop and fluid does not flow through the nozzle Discuss
- 10. In an impulse reaction turbine, the pressure drops gradually and continuously over
Options- A. fixed blades
- B. moving blades
- C. both fixed and moving blades
- D. none of these Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: Vb = 0.5 V cos ?
Correct Answer: decreases
Correct Answer: ?1 = ?2 and ?1 = ?2
Correct Answer: increase the entropy
Correct Answer: Yes
Correct Answer: 282 kW
Correct Answer: False
Correct Answer: more
Correct Answer: there is no pressure drop and fluid does not flow through the nozzle
Correct Answer: both fixed and moving blades
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