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Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
  • Question

  • 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

  • Correct Answer
  • 5.46 bar 

    • Steam Nozzles and Turbines problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. A binary vapour plant consists of

    • Options
    • A. steam turbine
    • B. steam condenser
    • C. mercury boiler
    • D. all of these
      • Discuss
    • 5. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 6. The turbine blades do not change the direction of steam issuing from the nozzle.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. 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
      • Discuss
    • 8. 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
    • 9. 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
    • 10. Thermal equilibrium means that the flow of steam is

    • Options
    • A. isothermal
    • B. isentropic
    • C. hyperbolic
    • D. polytropic
      • Discuss

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