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Power Systems

Power Systems
For load flow studies, What are the quantities specified at load bus are

 V and δ
 P and Q
 P and V
 δ and Q

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs. The symmetrical breaking current is

 45 kA.
  35 kA.
 55 kA.
 50 kA.

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

 any of the above
 Impedance relays
 Mho relays
 Admittance relays

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Power Systems
Specified quantities of load bus are

 P and Q
 P and δ
 V and δ
 Q and V

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Power Systems
In a 3-phase, 5 kV, 5 MVA system, what is the base impedance?

 5 ohms
 50 ohms
 500 ohms
 0.5 ohm

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Power Systems
The insulation of modern EHV is designed based on

 RI.
 lightning voltage.
  switching voltage.
 corona.

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