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Power Systems

Power Systems
Normally Z bus matrix is a

 unit matrix
 full matrix
 null matrix
 sparse matrix

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Power Systems
Reflection coefficient of voltage is Rv

 2Zs/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)
 2Zl/(Zs + Zl)

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

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Power Systems
The corona loss on a particular system at 50 Hz is 1 kW/km per phase. What is the corona loss at 60 Hz in kW/km per phase?

 1.13
 1
 1.25
 0.89

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Power Systems
Which of the following statements is/are true? Due to corona,

All of these
 interference increases
 charging current increases
 power loss increases

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Power Systems
Which of the following is/are the methods of improving transient stability?

 Fast acting excitation control
 Dynamic breaking
All of these
 Fast acting governing system

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