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Power Systems

Power Systems
For n bus power system size of Y bus matrix is

 (n-1)×(n-2)
 (n-1)×(n-1)
 n×n
 (n-2)×(n-2)

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Power Systems
Which of following power plants is free from environmental problem

 Steam.
  Hydroelectric.
 Diesel engine.
 Nuclear.

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Power Systems
Which of the following relays are used in protection of medium transmission lines?

 Admittance relays
 Impedance relays
 any of the above
 Mho relays

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

 increase
 decrease
 remains same
None of these

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Power Systems
For 66 kV lines the number of insulator discs of each 11 kV used are

 3
 5
 6
 12

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Power Systems
Pump storage schemes are used to improve

 the power factor.
  the plant capacity factor as well as the load factor of the power system.
 the load factor.
 the diversity factor.

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