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Power Systems

Power Systems
The most commonly used material for insulators of overhead lines is

 glass
 porcelain
 mica
 PVC

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Power Systems
In load flow studies PV bus is treated as PQ bus when

 phase angle become high
 reactive power goes beyond limit
 any of the above
 voltage at the bus become high

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Power Systems
Asynchronous tie line is a

None of these
 DC transmission line
 AC transmission line
 either 1 or 2

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 90%
 50%
 86%%
 75%

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Power Systems
The shape of the disc of an induction disc relay is

  spiral.
  none of these.
  circular.
  elliptical.

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Power Systems
The rate of rise of re-striking voltage is dependent upon

 capacitance of the system only
 both 1 and 2
 inductance of the system only
 resistance of the system only

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