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Power Systems

Power Systems
Condition for zero voltage regulation is

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

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Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is suited for capacitor bank switching

  oil.
  air blast.
  vacuum.
  SF6.

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

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

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Power Systems
Earthing switch is used for

 measuring of safety voltage
All of these
 discharging residual energies
 protection of equipment from ground faults

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Power Systems
Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of

 16 MJ/MVA
 4 MJ/MVA
 8 MJ/MVA
 2 MJ/MVA

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Power Systems
Deflectors are provided in

  Pelton wheel.
 Francis turbine.
 Kaplan turbine.
 propeller turbine.

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