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Power Systems

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

None of these
 less
 either 1 or 2
 more

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Power Systems
The arc voltage produced in an AC circuit breaker is always

 leading the arc current by 90°.
 in phase opposition with the arc current.
  in phase with the arc current.
 lagging the arc current by 90°.

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 -2 - j 1 A
 1 + j 2 A
 1 + j 4 A
 5 + j 7 A

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Power Systems
Which of the following rotor is used in thermal power plants?

 either of these
 squirrel cage rotor
 cylindrical rotor
 salient pole rotor

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Power Systems
A penstock is used as a condition between

 none of above.
 the heat ex-changer and the turbine in nuclear power plant.
  the dam and the turbine in a hydro station.
 the turbine and discharge drain.

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Power Systems
Advantages of gauss siedel method is/are

All of these
 calculation time for each iteration is less
 applicable for large power system network
 number of iterations are less

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