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Power Systems

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

 Q and V
 V and δ
 P and V
 P and Q

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Power Systems
A generated station has a maximum demand of 30 MW, a load factor of 60% and a plant capacity factor of 50%. The reserve capacity of the plant is

 5 MW
 10 MW
 12 MW
 6 MW

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Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 two
 three
 one
 six

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

All of these
 power loss decreases
 charging current increases
 interference decreases

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Power Systems
For symmetrical network, the neutral current is

 maximum
 zero
 infinity
 any of the above

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Power Systems
Mho relay is used for protection of

  short lines.
  none of these.
  medium lines.
  long lines.

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