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Electric Circuits

Electric Circuits
Which of the following materials has highest electrical conductivity ?

  Silver.
  Copper.
  Aluminium.
  Steel.

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Electric Circuits
Find the Z parameters of the circuit shown in figure.

 Z11 = 3; Z12 = 3; Z21 = 3; Z22 = 3
 Z11 = 1; Z12 = 1; Z21 = 1; Z22 = 1
 Z11 = 2; Z12 = 1; Z21 = 1; Z22 = 2
 Z11 = 3; Z12 = 1; Z21 = 1; Z22 = 3

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Electric Circuits
The rms value of sine wave is 100 A. Its peak value is

 282.8 A.
 70.7 A.
 150 A.
 141.4 A.

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Electric Circuits
A wire 2.5 m long is bent into a square. An current of 100 A flowing through the wire will produce a magnetizing force at the center of the square, equal to

 72 AT / m.
 144 AT / m.
 222 AT / m.
 196 AT / m.

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Electric Circuits
Which of the following can not be connected in series unless they are identical?

 Current source.
 Voltage source.
 Both of above.
 Resistance.

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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

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

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