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Power Systems

Power Systems
Peak load power plants is/are

 diesel plant
 both 1 and 2
 nuclear plants
 pumped storage plant

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Power Systems
Communications lines are treated as

 any of the above
 long transmission lines
 medium transmission lines
 short transmission lines

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Power Systems
Which of the following relays is/are unit protection relays?

 both 1 and 2
 Differential relays
 Buccholz relays
 over current relays

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Power Systems
Offset mho relay is used for the protection of equipment when

 failure of prime mover of the generator
 loss of excitation of the generator
 either 1 or 2
None of these

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Power Systems
Which of the following represents the transmission or reflection coefficient of voltage Tv? (Zl = Surge impedance of load, Zs = Surge impedance of line)

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

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Power Systems
If sag in an overhead line increase, tension in the line

 increase
 remains same
None of these
 decrease

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