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Power Systems

Power Systems
In which of the following given faults, all the sequence currents are equal?

 LLL
 LLG
 LL
 LG

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Power Systems
Normally Z bus matrix is a

 sparse matrix
 unit matrix
 full matrix
 null matrix

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Power Systems
The main objectives of power system is/are

All of these
 Cost of electrical energy per KWh is to be minimum
 Reliable power has to be available
 Flexible power has to be available.

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Power Systems
Condition for maximum voltage regulation

 cosφ = R/X
 tanφ = X/R
 cosφ = X/R
 tanφ = R/X

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Power Systems
The voltage regulation of a line at full load 0.8 power factor is 11. A long transmission line under no load conditions, for a good voltage profile needs

All of these
 shunt reactor at receiving end
 shunt resistance at receiving end
 shunt capacitor at receiving end

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Power Systems
A power station plant load factor is defined as the ratio of

 minimum load to peak load
 the energy generated to that of maximum energy that could have been generated
 average load to the peak load
 minimum load to average load

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