Steam Nozzles and Turbines problems
- 1. The action of steam in a steam turbine is
Options- A. static
- B. dynamic
- C. static and dynamic
- D. neither static nor dynamic Discuss
Correct Answer: dynamic
- 2. The reheat factor is the ratio of the
Options- A. cumulative heat drop to the isentropic heat drop
- B. isentropic heat drop to the heat supplied
- C. total useful heat drop to the total isentropic heat drop
- D. none of the above Discuss
Correct Answer: cumulative heat drop to the isentropic heat drop
- 3. The value of the reheat factor varies from
Options- A. 1.02 to 1.06
- B. 1.08 to 1.l0
- C. 1.2 to 1.6
- D. 1.6 to 2 Discuss
Correct Answer: 1.02 to 1.06
- 4. In a reaction turbine, when steam flows through the fixed blades,
Options- A. pressure increases while velocity decreases
- B. pressure decreases while velocity increases
- C. pressure and velocity both decreases
- D. pressure and velocity both increases Discuss
Correct Answer: pressure decreases while velocity increases
- 5. The discharge is __________ at critical pressure.
Options- A. zero
- B. minimum
- C. maximum Discuss
Correct Answer: maximum
- 6. The stage efficiency (?S) is given by (where ?B = Blading efficiency, and ?N = Nozzle efficiency)
Options- A. ?S = ?B x ?N
- B. ?S = ?B/?N
- C. ?S = ?N/?B
- D. none of these Discuss
Correct Answer: ?S = ?B x ?N
- 7. The steam enters the nozzle at a
Options- A. high pressure and a low velocity
- B. high pressure and a high velocity
- C. low pressure and a low velocity
- D. low pressure and a high velocity Discuss
Correct Answer: high pressure and a low velocity
- 8. Which of the following statement is correct?
Options- A. The expansion of steam in a nozzle follows Rankine cycle.
- B. The friction in the nozzle increases the dryness fraction of steam.
- C. The pressure of steam at throat is called critical pressure.
- D. all of the above Discuss
Correct Answer: all of the above
- 9. In reaction turbines, the axial thrust is due to
Options- A. pressure drop across the rotor
- B. change in axial velocity
- C. both (a) and (b)
- D. none of these Discuss
Correct Answer: both (a) and (b)
- 10. The blade velocity coefficient is ratio of relative velocity of steam at outlet tip of the blade to the relative velocity of steam at inlet tip of the blade.
Options- A. True
- B. False Discuss
Correct Answer: True
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