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Power Systems

Power Systems
Condition for zero voltage regulation is

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

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Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.0060
 0.0030
 0.30
 0.60

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Power Systems
Which type of connection is employed for current transformers for the protection of delta- star connected 3-phase transformer?

 star-delta
 delta-delta
 delta-star
 star-star

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Power Systems
If sparsity of a 5 bus transmission line is 0.4. Find the number of transmission lines?

 3
 6
 5
 4

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Power Systems
A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

 70 kVA.
  89.22 kVA.
 49 kVA.
  35 kVA.

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Power Systems
As the frequency of the system is increased, the charging MVAR

None of these
 decreases
 increases
 remains unaffected

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