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Power Systems

Power Systems
Ferranti effect occurs under

 no load
 full load
 any of the above
 half load

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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?

 0.1
 1000
 10
 0.001

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Power Systems
In relay coil which is used?

  Power transformer.
  Potential transformer.
  Current transformer.
  Instrument transformer.

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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 Charging current under no load?

 0.344∠90° A/phase
 0.144∠90° A/phase
 1.144∠90° A/phase
 0.512∠90° A/phase

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Power Systems
In thermal power plants the size of coal after crushing

  300 mm.
 40 mm.
  20 - 25 mm.
 200 - 205 mm.

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Power Systems
If the diameter of the conductor is increased

 the inductance is increased
 the resistance is increased
 the inductance is decreased
 no change in inductance and resistance

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