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Power Systems

Power Systems
Rankine cycle efficiency of a steam power plant is of

  60 - 80 %.
  20 - 30 %.
  45 - 80 %.
  30 - 45 %.

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Power Systems
Which of the following matrix is used for load flow studies?

 Unit matrix
 null matrix
 Y bus matrix
 Z bus matrix

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Power Systems
Where is the draft tube of a hydroelectric plant that is an airtight pipe located

 In between the runner exhaust and the tail race.
 Near the surge tank.
  In between the penstock and runner.
 At the beginning of the penstock.

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Power Systems
Which of the following is/are the effects of corona

 charging current increases
All of these
 power loss decreases
 interference decreases

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Power Systems
If power P available from a hydroelectric plant is given by the formula P = 9.81QH, where Q is the flow rate through the turbine in l / s and H is the head in meters, then P will be unit of

 kJ / S.
 kWh.
  W.
 HP.

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Power Systems
As the frequency of the system is increased, the charging MVAR

 remains unaffected
None of these
 decreases
 increases

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