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Power Systems

Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 three
 six
 one
 two

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Power Systems
More efficient plants are used as

 base load plant
 peak load plant
 both 1 and 2
None of these

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Power Systems
The characteristic impedance of a transmission line is

 Inversely proportional to square root of its length.
 Independent of its length.
 Directly proportional to square root of its length.
 Directly proportional to its length.

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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 500/5. The plug setting multiplier for a fault current of 5 kA is

 8
 6
 5
 2

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Power Systems
The specific speeds of Kaplan, Francis and Pelton turbines are in

 neither increasing nor decreasing order.
 the increasing order.
None of these
  the decreasing order.

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Power Systems
In a 400 KV network, 360 KV is recorded at a 400 KV bus. The reactive power absorbed by shunt rated for 50 MVAr, 400 KV connected at the bus is

 61.73 MVAr.
  40.5 MVAr.
 45 MVAr.
 55.56 MVAr.

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