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Power Systems

Power Systems
In which of the following given faults, all the sequence currents are equal?

 LLL
 LLG
 LL
 LG

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Power Systems
The water from a catchment is 60*106 cu m annually and hydro station has head of 40 m. Assuming ideal generator and turbine, the power that can be theoretically generated is

 250 kW
 750 kW
 500 kW
 300 kW

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Power Systems
A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

 10
 1000
 0.001
 0.1

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Power Systems
The specific speed ( NS ) of turbine is given by

 P√( N ) / H3/2.
 none of these.
 N√( P ) / H2/3.
  N√( P ) / H1.25.

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Power Systems
What type of back up protection is used for alternators?

  Impedance relay.
  Mho relay.
  IDMT relay.
  Buchholz relay.

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Power Systems
Proximity effect depends on

 distance between the conductors
 relative permeability
All of these
 frequency

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