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Electric Circuits

Electric Circuits
In a series resonant circuit impedance is

 minimum.
 maximum.
 zero.
 none of these.

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Electric Circuits
From the circuit diagram shown in question 1 find the Norton current.

 4 A.
 1 A.
 2.5 A.
 2 A.

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Electric Circuits
Two wires of A and B of the same material and length ‘l’ and ‘2l’ have radius ‘r’ and ‘2r’ respectively. The ratio of their specific resistance will be

 4:1.
 1:2.
 1:8.
 1:1.

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

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Electric Circuits
Instantaneous power in inductor is proportional to the

 square of the rate of change of current.
 temperature of the inductor.
 square of instantaneous current.
 product of the instantaneous current and rate of change of current.

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Electric Circuits
Types of rotating machines

 IM.
 synchronous machine.
 transformer.
 both B and C.

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