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Power Systems

Power Systems
Peak load power plants is/are

 pumped storage plant
 diesel plant
 both 1 and 2
 nuclear plants

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.7 pu, Zm =0.2 pu
 Zs = 0.5 pu, Zm =0.6 pu
 Zs = 0.2 pu, Zm =0.7 pu
 Zs = 0.6 pu, Zm =0.5 pu

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Power Systems
A diesel power plant is generally used as a/an

 Standby/emergency plant.
 Any of above.
 Base load.
 Peak loads.

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Power Systems
Reactance relays are used for the protection of

 short transmission lines only
All of these
 long transmission lines only
 medium transmission lines only

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Power Systems
Condition for zero voltage regulation is

 tanφ = X/R
 cosφ = R/X
 tanφ = R/X
 cosφ = X/R

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

 Over fluxing relay
 Buchholz relay
 Over current relay
 Differential relay

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