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Power Systems

Power Systems
Mho relay is used for protection of

  medium lines.
  none of these.
  long lines.
  short lines.

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Power Systems
A transmission line has a reactance of 1 Pu is operating at Vs = Vr = 1 Pu. The generator is connected at source end which is delivering 0.5 Pu of active power and the transmission line is compensated with a series capacitance of 0.5 Pu. Find the load angle with series capacitance compensation ?

 29°
 10.5°
 35.5°
 14.5°

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Power Systems
When is the ferranti effect on long overhead lines experienced?

 The line is lightly loaded
 The line is fully loaded
 The power factor is unity
 The line is heavily loaded

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Power Systems
Which of the following method is/are more reliable?

All of these
 Gauss-Siedel (GS) method
 Fast Decoupled Load Flow (FDLF) method
 Newton Raphson (NR) method

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Power Systems
Skin effective is more in case of

 power lines
 communication lines
None of these
 same in both cases

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Power Systems
The load current in short circuit calculations are neglected because

 short circuit currents are greatly out of phase with load currents
 short circuit currents are much larger than load currents
 both 1 and 2
 nether 1 nor 2

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