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Power Systems

Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LLL
 LL
 LG
 LLG

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Power Systems
Which of the following power plants can generate power at unpredictable or uncontrollable time

 Cooling tower.
 Condenser.
 Wind turbine.
 Pulverising unit.

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Power Systems
Offset mho relay is used for the protection of equipment when

 either 1 or 2
None of these
 loss of excitation of the generator
 failure of prime mover of the generator

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Power Systems
Oxide film arrestor has which of the following properties?

 Does not require daily charging.
 Installed at points of transmission line where daily visit is difficult.
 Both A and B.
 It is expensive.

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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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Power Systems
A 3-phase transmission line has its conductors at the corners of an equilateral triangle with side 3m. The diameter of each conductor is 1.63 cm. The inductance of the line per phase per km is

 1.093 mH
 1.232 mH
 1.043 mH
 1.182 mH

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