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Power Systems

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

 glass
 mica
 porcelain
 PVC

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Power Systems
Which of the following transmission line is most practically used in load flow analysis?

 nether 1 nor 2
 Nominal T
 Nominal ∏
 either 1 or 2

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Power Systems
Mho relay is usually employed for protection of

 any line
 medium transmission lines only
 short transmission lines only
 long transmission lines only

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Power Systems
A buchholz relay is used for

 protection of a transformer against all internal faults
 nether 1 nor 2
 protection of a transformer against all external faults
 both 1 and 2

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

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

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Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 -2
 0
 1
 -1

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