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Electric Circuits

Electric Circuits
In what connection we get neutral?

  Delta.
  Star.
  Mesh.
  Both A and B.

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

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Electric Circuits
Electric flux is proportional to

 rate of change of potential difference.
 rate of change of current.
 resistivity of medium.
 potential difference between electrodes.

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Electric Circuits
A capacitor having a capacitance of 40 μF is connected across 250 V DC source. The charging current will be least

 when capacitor is almost 25% charged.
 initially.
 when capacitor is half charged.
 when capacitor is fully charged.

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Electric Circuits
The maximum power that can be transferred to the load resistor R from the voltage source in the figure is

 6/8W.
 9/8 W.
 7.5 W.
 1 W.

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Electric Circuits
In direct arc furnace which of following is of high value?

 Power factor.
 Voltage.
 Current.
 All of above.

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MORE MCQ ON Electric Circuits

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