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Power Systems

Power Systems
The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase?

 1.13
 1
 0.882
 0.93

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Power Systems
For n bus power system size of Y bus matrix is

 (n-2)×(n-2)
 (n-1)×(n-2)
 (n-1)×(n-1)
 n×n

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Power Systems
For which one of the following types of motors, is the equal area criterion for stability applicable?

 Three phase synchronous motor
 DC series motor
 Three phase induction motor
 DC shunt motor

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Power Systems
Which of the following is an impulse turbine

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

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Power Systems
A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠90° Ω, C = 0.5*10^-6∠90° â„§. Find the shunt reactor required for compensating ferranti effect?

 1500 Ω
 3000 Ω
 2000 Ω
 500 Ω

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Power Systems
The rating of CB is in terms of

  current.
  volt - ampere.
  VAR.
  voltage.

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