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Power Systems

Power Systems
For 66 kV lines the number of insulator discs of each 11 kV used are

 6
 12
 5
 3

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Power Systems
Which of the following is/are the methods of improving transient stability?

 Fast acting governing system
 Dynamic breaking
 Fast acting excitation control
All of these

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Power Systems
In a three-phase system, when the loads are perfectly balanced, the neutral current is

  two - thirds of maximum.
  one - third of minimum.
  one - third of maximum.
  zero.

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Power Systems
A steam power generation has an overall efficiency of 20 %. 0.6 Kg of coal is burnt per kWh of electrical energy generated. Calculated the calorific value of fuel

  7166.67 KCal / Kg.
 7000 KCal / Kg.
 7268.45 KCal / Kg.
 7562 KCal / Kg.

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Power Systems
Critical disruptive voltage is a voltage at which

 corona is visible with blue or violet colour
 nether 1 nor 2
 corona is just initiated
 both 1 and 2

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Power Systems
Find the value of a729, where "a" is the operator

 1
 α
 α²
 0

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