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Power Systems

Power Systems
Merze price current scheme protection is used in

  transformer.
  alternator.
  both A and B.
  bus bars.

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Power Systems
For a 500 Hz frequency excitation, a 100 km long power line will be modelled as

 medium transmission line
 shunt capacitor
 long transmission line
 any of the above

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Power Systems
A transmission line has (2 + j4)Ω impedance, 100 MVA and base voltage is 10 KV. Find the per unit impedance value of transmission line?

 (2 + j4 ) pu
 (0.5 + j1 ) pu
 (1 + j2 ) pu
 (4 + j8 ) pu

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Power Systems
If the diameter of the conductor is increased

 the resistance is increased
 the inductance is increased
 the inductance is decreased
 no change in inductance and resistance

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Power Systems
Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is

 200 MW
 1600 MW
 400 MW
 800 MW

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Power Systems
The ratio of reset to pick up current for an induction cup relay is approximately

 1.35.
 0.75.
  0.99.
 1.0.

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