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Power Systems

Power Systems
Ferranti effect occurs under

 half load
 full load
 any of the above
 no load

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Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 8
 5
 4
 2

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 1 + j 2 A
 -2 - j 1 A
 5 + j 7 A
 1 + j 4 A

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Power Systems
The rate of rise of re-striking voltage is dependent upon

 resistance of the system only
 capacitance of the system only
 inductance of the system only
 both 1 and 2

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Power Systems
If in a line, resistance and reactance are found to be equal and regulation is zero, then load will have

 zero power factor
 0.707 leading power factor
 0.707 lagging power factor
 unity power factor

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Power Systems
On what factors does the selection of a water turbine depend

 Nature of load.
  All of above.
 Speed.
 Working head.

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