Q. If the power factor is 1/10 and the value of impedance is 20 ohm, calculate the resistance in the circuit.

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Q. If the resistance in a circuit is 2 ohm and the impedance is 20 ohm, calculate the power factor.

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Q. If tan ϕ = 10 and the resistance is 2 ohm, calculate the inductive reactance.

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Q. What is the unit for inductive reactance?

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Q. An induced emf is said to be ________

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Q. Among the following, which is the right formula for inductance?

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Q. Among the following, which is the right formula for inductance of N turns?

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Q. For a coil having a magnetic circuit of constant reluctance, the flux is ___________ to the current.

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Q. For a coil having a magnetic circuit of constant reluctance, if the flux increases, what happens to the current?

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Q. The unit for inductance is ___________

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Q. If either the inductance or the rate of change of current is doubled, the induced e.m.f?

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Q. If the current changes from 5A to 3A in 2 seconds and the inductance is 10H, calculate the emf.

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Q. If the current changes from 5A to 3A in x sec and inductance is 10H. The emf is 10V, calculate the value of x.

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Q. If the current changes from 3A to 5A in 2s and the emf is 10V. Calculate the inductance.

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Q. As the number of turns in the coil increases, what happens to the inductance of the coil?

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Q. What happens to the inductance when the magnetic field strength decreases?

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Q. What happens to the inductance when the current in the coil becomes double its original value?

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Q. When the coil is wrapped around a ferromagnetic core, why is it difficult to determine the inductance?

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Q. What happens to the inductance as the area of the cross section of the coil increases?

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Q. What happens to the inductance as the length of the magnetic circuit increases?

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