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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 V
 δ and Q
 P and Q

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Power Systems
The arc voltage produced in an AC circuit breaker is always

 leading the arc current by 90°.
 in phase opposition with the arc current.
  in phase with the arc current.
 lagging the arc current by 90°.

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Power Systems
The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is RYB the phase current IYB is

 20.
  5.
 10.
 55.1.

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Power Systems
a 50 Hz, 3-phase synchronous generator has inductance per phase of 15 mH. The capacitance of the generator and circuit breaker is 0.002 µF. What is its natural frequency?

 29 kHz
 290 kHz
 29 MHz
 2.9 kHz

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Power Systems
Plant capacity factor value is

 less than 1
 greater than 1
 0
 1

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Power Systems
Which of the following statements is/are true? By increasing of temperature,

 sag increase
 tension decrease
 both 1 and 2
 neither 1 nor 2

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