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

  • 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

  • Correct Answer
  • ?1 = ?2 and ?1 = ?2 

    • Steam Nozzles and Turbines problems

    Search Results

    • 1. 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
    • 2. In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 3. Steam turbines may be classified according to

    • Options
    • A. direction of steam flow
    • B. number of stages
    • C. mode of steam action
    • D. all of these
      • Discuss
    • 4. Which of the following statement is correct?

    • Options
    • A. The efficiency of steam turbines is greater than steam engines.
    • B. A flywheel is a must for steam turbine.
    • C. The turbine blades do not change the direction of steam issuing from the nozzle
    • D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
      • Discuss
    • 5. During flow through a nozzle, no heat is supplied or rejected by the steam.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 6. When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.

    • Options
    • A. increases
    • B. decreases
      • Discuss
    • 7. 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
    • 8. The expansion of steam in a nozzle follows

    • Options
    • A. Carnot cycle
    • B. Rankine cycle
    • C. Joule cycle
    • D. Stirling cycle
      • Discuss
    • 9. 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
    • 10. 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

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