Steam Nozzles and Turbines problems
- 1. Thermal equilibrium means that the flow of steam is
Options- A. isothermal
- B. isentropic
- C. hyperbolic
- D. polytropic Discuss
Correct Answer: isentropic
- 2. 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
Correct Answer: all of these
- 3. 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
Correct Answer: remains constant
- 4. A regenerative steam cycle renders
Options- A. increased work output per unit mass of steam
- B. decreased work output per unit mass of steam
- C. increased thermal efficiency
- D. decreased work output per unit mass of steam as well as increased thermal efficiency Discuss
Correct Answer: decreased work output per unit mass of steam as well as increased thermal efficiency
- 5. The ratio of the useful heat drop to the isentropic heat drop is called
Options- A. condenser efficiency
- B. nozzle efficiency
- C. boiler efficiency
- D. vacuum efficiency Discuss
Correct Answer: nozzle efficiency
- 6. The critical pressure ratio (p2/p1) is given by
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 7. The flow through a nozzle is regarded as
Options- A. constant volume flow
- B. constant pressure flow
- C. isothermal flow
- D. isentropic flow Discuss
Correct Answer: isentropic flow
- 8. The ratio of the workdone on the blades to the energy supplied to the blades, is called
Options- A. blading efficiency
- B. nozzle efficiency
- C. gross or stage efficiency
- D. mechanical efficiency Discuss
Correct Answer: blading efficiency
- 9. The turbine blades are
Options- A. straight
- B. circular
- C. curved Discuss
Correct Answer: curved
- 10. The impulse reaction turbine has its driving force
Options- A. as an impulsive force
- B. as a reaction force
- C. partly as an impulsive force and partly as a reaction force
- D. none of the above Discuss
Correct Answer: partly as an impulsive force and partly as a reaction force
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