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Power Systems

Power Systems
Condition for zero voltage regulation is

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

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Power Systems
In triangular configuration, inductance and capacitance values are ------ and ------ respectively

 higher, less
 less, higher
 less, less
 higher, higher

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Power Systems
A transmission line has a reactance of 1 Pu is operating at Vs = Vr = 1 Pu. The generator is connected at source end which is delivering 0.5 Pu of active power. Find the load angle?

 35°
 60°
 45°
 30°

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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

 0.0030
 0.0060
 0.30
 0.60

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Power Systems
Normally Z bus matrix is a

 sparse matrix
 full matrix
 null matrix
 unit matrix

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Power Systems
Which of following power plants is free from environmental problem

 Steam.
  Hydroelectric.
 Diesel engine.
 Nuclear.

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