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Power Systems

Power Systems
Ferranti effect occurs under

 no load
 any of the above
 half load
 full load

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Power Systems
The charging current of a 400 kV line is more than that of a 220 kV line of the same length?

None of these
 either 1 or 2
 False
 True

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Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 250
 500
 450
 900

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Power Systems
For some given transmission line the expression for voltage regulation is given by (Vs - Vr)/Vr *100%. Hence,

 this may either be a medium line or short line
 this must be a short line
None of these
 this expression is true for any line

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Power Systems
Earthing switch is used for

 measuring of safety voltage
 protection of equipment from ground faults
All of these
 discharging residual energies

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Power Systems
A thermal protection relay provides protection against what?

 Short circuit
 any of the above
 Temperature
 Over load

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