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Power Systems

Power Systems
For symmetrical network, the neutral current is

 maximum
 zero
 infinity
 any of the above

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Power Systems
By using guard ring in a transmission line, its string efficiency

 decrease
 increase
 remains unaffected
None of these

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Power Systems
At slack bus, which one of the following combinations of variables is not specified?

 V and δ
 P and Q
 P and V
 Q and V

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Power Systems
A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum and zero voltage regulation?

 0.6 lag and 0.8 lead
 0.8 lag and 0.6 lead
 0.6 lag and 0.6 lead
 0.8 lag and 0.8 lead

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Power Systems
A sort line with R/X ratio 1, the zero regulation is obtained when the power factor of the load is

 0 leading
 0.5
 0.707 leading
 unity

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Power Systems
Deaerative heating is done to

  remove dissolved gases in water.
 remove dissolved.
 heat the feed water.
 heat the steam.

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