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Power Systems

Power Systems
Condition for zero voltage regulation is

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

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Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

 15%
 85%
 88.2%
 11.8%

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Power Systems
Find the number of strands of ACSR conductor for 4 layer transmission line?

 1
 29
 37
 7

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Power Systems
Alternate formation and breakage of bubbles are called

All of these
  cavitations.
  water hamming.
  surgfication.

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Power Systems
The insulation of the modern EHV lines is designed based on

 corona.
 the lighting voltage.
 R × I.
  the switch voltage.

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Power Systems
A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

All of these
 √(1 + Kcsh)/Zs
 Zs*√(1 + Kcsh)
 Zs/√(1 + Kcsh)

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