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Power Systems

Power Systems
Lightning arresters are made up of which material?

 any of the above
 silver
 silicon oxide
 copper

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Power Systems
In a regenerative cycle, feed water is heated by

  drained steam from turbine.
 all of above.
 heaters.
 exhaust gas.

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

 charging current increases
 interference increases
All of these
 power loss increases

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Power Systems
Reactance relays are used for the protection of

 medium transmission lines only
 long transmission lines only
 short transmission lines only
All of these

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Power Systems
At slack bus, which one of the following combinations of variables is not specified?

 P and Q
 Q and V
 P and V
 V and δ

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Power Systems
To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with

 2nd harmonic current.
 7th harmonic current.
 3rd harmonic current.
  5th harmonic current.

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