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Power Systems

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

 α²
 1
 0
 α

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Power Systems
Corona loss is ----------------- on hilly areas than as plain areas.

 remain same
 less
None of these
 more

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Power Systems
The economics of power plant is greatly influenced by

 diversity factor
 both 1 and 2
 nether 1 nor 2
 load factor

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Power Systems
The use of high speed circuit breakers

  improves system stability.
 increased the short circuit current.
 decrease system stability.
 reduces the short circuit current.

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Power Systems
A transmission line has an impedance of (2+j6) Ω has voltage regulation of 10% at a load power factor of 0.8 lag. Find the voltage regulation for a load of 0.6 lead

 6.92%
 -10%
 -6.92%
 10%

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Power Systems
Recovery voltage in CB is equal to

  normal frequency 50 Hz rms voltage.
  arcing period voltage.
  transient voltage.
  none of these.

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