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Power Systems

Power Systems
Fault calculations using computer are usually done by

 Z bus method
None of these
 Y bus method
 either 1 or 2

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Power Systems
Which of the following represents the transmission or reflection coefficient of voltage Tv? (Zl = Surge impedance of load, Zs = Surge impedance of line)

 (Zs - Zl)/(Zs + Zl)
 2Zl/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)
 2Zs/(Zs + Zl)

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Power Systems
Frequencies must be same in which of the following line to exchange the power from one place to other place ?

 both 1 and 2
 No need of same frequency for exchange of power
 Synchronous line
 Asynchronous line

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Power Systems
One Kg of natural uranium gives energy equivalent to about

 5000 Kg of coal.
  10500 Kg of coal.
 100 Kg of coal.
 1000 Kg of coal.

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 90%
 50%
 75%
 86%%

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, the symmetrical breaking capacity is 2000 MVA, 3 secs. Then the making capacity is

 5200 MVA.
 5500 MVA.
  5000 MVA.
  5100 MVA.

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