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Power Systems

Power Systems
Corona loss is ----------------- on hilly areas than as plain areas.

None of these
 less
 remain same
 more

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Power Systems
Resistance switching in normally employed in

 bulk oil breakers.
  air blast circuit breaker.
 all breakers.
 minimum oil breakers.

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Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm sinωt?

 9.68 msec
 4.68 msec
 1.47 msec
 2.63 msec

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Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Hydrogen.
  Liquid.
  Air.
  Water.

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Power Systems
If skin depth is more, then skin effect is

 less
 more
None of these
 either 1 or 2

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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
 one
 three
 six

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