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Electric Circuits

Electric Circuits
Among the options which metal has the highest electrical conductivity?

 Copper.
 Aluminium.
 Steel.
 Stranded aluminium.

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Electric Circuits
A load is connected to an active network. At the terminals to which the load is connected, RTH = 10 Ohm, VTH = 60V. Then maximum power supplied to the load is

 60W.
 90W.
 360W.
 180W.

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Electric Circuits
For balanced star load, if unbalanced line current are IR, IY, IB equal to - j10, - j10 and - j20 respectively, the neutral current will be equal to

  (-9.66 + j5) A.
  (8.66 - j5) A.
  (8.66 + j5) A.
  (-8.66 - j5) A.

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Electric Circuits
Condition of reciprocity in Y-parameter representation is

 Y12 = Y22.
 Y11 = Y12.
 Y12 = Y21.
 Y11 = Y22.

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Electric Circuits
An electrical motor has rating of 10 MVA at 0.8 lag, represented as series RL circuit at a 50 MVA base. Find the impedance value?

 (4 + j2 ) pu
 (3 + j4) pu
 (4 + j3) pu
 (2 + j4) pu

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Electric Circuits
Total instantaneous power supplied by a 3 - φ AC supply to a balanced RL load is

 constant.
 pulsating with non zero average.
 zero.
 pulsating with zero average.

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MORE MCQ ON Electric Circuits

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