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Power Systems

Power Systems
Breaking current is a ------------------ value?

 average
 RMS
 any of the above
 maximum

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Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm cosωt?

 4.68 msec
 9.68
 2.63 msec
 1.47 msec

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Power Systems
Which of the following effects are associated with transmission line

 skin effect
All of these
 corona effect
 ferranti effect

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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 ?

 14.5°
 29°
 35.5°
 10.5°

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Power Systems
On which one of the following cycles does a modern steam power plant work?

 Carnot cycle
 Rankine cycle
 Otto cycle
 Bell-Coleman cycle

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Power Systems
The pickup value of relay is 6.5 Amp and fault current in relay coil is 39 Amp. Its plug setting multiplier is

 8 A.
  6 A.
 7 A.
 10 A.

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