Q. What happens to the effective inductance when a ferromagnetic core is introduced?

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Q. A laminated steel ring is wound with 200 turns. When the magnetizing current varies between 5 and 7 A, the magnetic flux varies between 760 and 800 Wb. Calculate the inductance of the coil.

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Q. Calculate the number of turns in an inductor with a ferromagnetic core when the inductance is 4000 H, the current changes from 5A to 7A and the flux changes from 760 to 800 Wb.

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Q. Calculate the change in current in an inductor having inductance 4000H, number of turns is 200 and the flux changes from 760 to 800 Wb.

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Q. Calculate the initial current in an inductor having inductance 4000 H, number of turns is 200 and the flux changes from 760 to 800 Wb. Current changes to 7A.

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Q. Calculate the change in flux of an inductor having inductance 4000 H, number of turns is 200 and the current changes from 5A to 7A.

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Q. Calculate the final flux in an inductor having inductance 4000 H, number of turns is 200 and the current changes from 5A to 7A. The initial flux is 760 Wb.

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Q. In a pure inductive circuit, the power factor is?

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Q. The charging time constant of a circuit consisting of an inductor is the time taken for the voltage in the inductor to become __________ % of the initial voltage.

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Q. What is the time constant of an inductive circuit?

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Q. Calculate the time constant of an inductive circuit having resistance 5 ohm and inductance 10H.

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Q. Calculate the resistance in an inductive circuit whose time constant is 2s and the inductance is 10H.

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Q. Calculate the inductance in an inductive circuit whose time constant is 2s and the resistance is 5 ohm.

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Q. The charging time constant of a circuit consisting of an inductor is the time taken for the current in the inductor to become __________% of the initial current.

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Q. What is the total applied voltage in an inductive circuit?

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Q. A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the initial value of the current in the circuit.

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Q. A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the final value of the current in the circuit.

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Q. A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the value of current 1s after the switch is closed.

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Q. A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the value of voltage 1s after the switch is closed.

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Q. Among the following, which is the right formula for decay in an inductive circuit?

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