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Power Systems

Power Systems
The most commonly used material for insulators of overhead lines is

 mica
 PVC
 porcelain
 glass

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Power Systems
If all the sequence voltages at the fault point in a power system are equal, then the fault point is a

 LL
 LG
 LLG
 LLL

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Power Systems
Which of the following is an impulse turbine

  Kaplan turbine.
  None of above.
  Pelton turbine.
  Francis turbine.

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

 distance relays
 offset mho relay
 reverse power relay
 impedance relay

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 41.075 kV/phase
 34.64 kV/phase
 17.32 kV/phase
 82.15 kV/phase

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Power Systems
A synchronous generator is of 100 MVA have inertia constant of 20 MJ/MVA. Find the angular momentum in MJsec/electrical degrees

 2000
 0.4
 5
 0.22

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