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Power Systems

Power Systems
Which of the following relationships are not valid for short transmission lines

 B = C = Z
All of these
 Is = Ir
 A = D = 1

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Power Systems
Reflection coefficient of voltage is Rv

 2Zs/(Zs + Zl)
 2Zl/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)

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Power Systems
Mho relay is usually employed for protection of

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

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Power Systems
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400 : 5, then plug setting multiplier will be

 10.
 15.
 50.
 25.

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Power Systems
Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

 Buchholz relay
 Differential relay
 Over current relay
 Over fluxing relay

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Power Systems
Which of the following produces the radio interference in communication lines?

 electro static induction
 both 1 and 2
None of these
 electro magnetic induction

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