Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
The ratio of total useful heat drop to the total isentropic heat drop, is called
Options- A. stage efficiency
- B. internal efficiency
- C. Rankine efficiency
- D. none of these
- Correct Answer
- internal efficiency
- 1. The turbine blades do not change the direction of steam issuing from the nozzle.
Options- A. True
- B. False Discuss
- 2. In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p2) will be
Options- A. 3.3 bar
- B. 5.46 bar
- C. 8.2 bar
- D. 9.9 bar Discuss
- 3. The turbine, in which the general direction of the steam flow is parallel to the turbine axis, is called axial flow turbines
Options- A. True
- B. False Discuss
- 4. A turbine is said to have an axial discharge when the steam leaves the blade tip at __________ to the direction of the blade motion.
Options- A. 60°
- B. 90°
- C. 180°
- D. 270° Discuss
- 5. The Parsons' reaction turbine has
Options- A. only moving blades
- B. only fixed blades
- C. identical fixed and moving blades
- D. fixed and moving blades of different shape Discuss
- 6. In a nozzle, whole frictional loss is assumed to occur between
Options- A. inlet and thoroat
- B. inlet and outlet
- C. throat and exit
- D. all of these Discuss
- 7. The efficiency of reaction turbine is maximum when (where ? = Angle made by the absolute velocity (V) at inlet)
Options- A. Vb = 0.5 V cos ?
- B. Vb = V cos ?
- C. Vb = 0.5 V2 cos ?
- D. Vb = V2 cos ? Discuss
- 8. Thermal equilibrium means that the flow of steam is
Options- A. isothermal
- B. isentropic
- C. hyperbolic
- D. polytropic Discuss
- 9. The variation of steam pressure in the nozzle depends upon
Options- A. velocity of steam
- B. specific volume of steam
- C. dryness fraction of steam
- D. all of these Discuss
- 10. The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
Options- A. remains constant
- B. decreases
- C. increases Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: False
Correct Answer: 5.46 bar
Correct Answer: True
Correct Answer: 90°
Correct Answer: identical fixed and moving blades
Correct Answer: throat and exit
Correct Answer: Vb = V cos ?
Correct Answer: isentropic
Correct Answer: all of these
Correct Answer: remains constant
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