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Power Systems

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

 1
 α²
 α
 0

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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?

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

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Power Systems
Equal area criteria is used for

 nether 1 nor 2
 absolute stability of the system
 either 1 or 2
 relative stability of the system

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, the symmetrical breaking capacity is 2000 MVA, 3 secs. Then the making capacity is

  5100 MVA.
 5500 MVA.
  5000 MVA.
 5200 MVA.

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Power Systems
The area under a flow duration curve represents

  total quantity of run-off during that period.
 total power available.
 total of units of energy available.
 maximum rate of run-off during the period.

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Power Systems
Which one of following is employed as a moderator by CANDU type of slow thermal nuclear reactors

 Water.
 Graphite.
  Heavy water.
 Beryllium.

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