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Power Systems

Power Systems
The pickup value of relay is 6.5 Amp and fault current in relay coil is 39 Amp. Its plug setting multiplier is

 7 A.
 8 A.
 10 A.
  6 A.

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Power Systems
The maximum demand of a consumer is 2 kW and corresponding daily energy consumption is 30 units. What is the corresponding load factor?

 75%
 25%
 50.5%
 62.5%

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Power Systems
Operating cost of thermal power station is

  less than that of diesel power plant.
 less than that of nuclear power plant.
 is the same as that of nuclear power plant.
 less than that of hydroelectric power plant.

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Power Systems
IF the time of operation of a relay for unity TMS is 10 sec then the time of operation for 0.5 TMS is

 20 sec.
 none of these.
 10 sec.
  5 sec.

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. The pick up value is

 15 A
 6.25 A
 12.5 A
 10 A

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Power Systems
Surge impedance loading (SIL) is represented by

 Vph²/Zs
 both 1 and 2
 Vl²*√(C/L)
 Vl²/Zs

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