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Power Systems

Power Systems
Condition for maximum voltage regulation

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

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Power Systems
The presence of earth in case of overhead lines

 increase capacitance
 increase inductance
 decrease inducatance
 decrease capacitance

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Power Systems
An ACSR conductor has a diameter of 2 cm has internal inductance of 0.05 mH/Km. If this ACSR is replaced with another having a diameter of 4 cm then its internal inductance is

 0.1 mH/Km
 0 mH/Km
 0.05 mH/Km
 0.025 mH/Km

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Power Systems
Advantages of pumped storage plants is/are

 operating time is minimum
 most economical as a peak load supply plant
All of these
 used as load frequency control

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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
 2
 4
 5

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Power Systems
The load current in short circuit calculations are neglected because

 both 1 and 2
 short circuit currents are greatly out of phase with load currents
 short circuit currents are much larger than load currents
 nether 1 nor 2

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