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Power Systems

Power Systems
Corona loss is ----------------- on hilly areas than as plain areas.

 more
None of these
 less
 remain same

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Power Systems
In case of failure of prime mover of the generator, which type of relay is used?

 reverse power relay
 offset mho relay
 impedance relay
 distance relays

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Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

 3.975 pu
 2.4 pu
 0.2 pu
 1.375 pu

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Power Systems
Under excited Synchronous phase modifier works as

 shunt reactor
 series capacitor
 shunt capacitor
 any of the above

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Power Systems
In a 220 kV system, the inductance and capacitance up to the circuit breaker location are 25 mH and 0.025 µF respectively. The value of resistor required to be connected across the breaker contacts which will give no transient oscillations, is

 250 Ω
 500 Ω
 25 Ω
 1000 Ω

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Power Systems
Percentage of carbon is highest in

  bituminous coal.
  coal gas.
  lignite coal.
  anthracite coal.

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