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Choke coil is a series

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Important Questions on Alternating Current

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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.1>Q 5
A variable inductor is connected to an AC source. When inductance increases, Then reactance
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.1>Q 6
EMF, applied and current in an A.C. circuit are E=102 sinωt V and I=52 cosωt A respectively. The average power loss in the circuit is, 
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.1>Q 7

Reading shown by the hot wire voltmeter used in the circuit here is

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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.1>Q 8

In the following circuit, there are two branches. One branch consists of a resistor and capacitor. The other branch consists of resistance and inductor. Find condition such that
(a) Phase difference between voltage and current in two branches is the same.
(b) Magnitude of current in the two branches is the same.
(c) Total current is in phase with the total voltage.

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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.2>Q 9

Power factor of the circuit shown here is

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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.2>Q 10
For which set of values of XL, XC and R, a series LCR circuit will be in resonance?
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.2>Q 11

Find average power loss in the following RLC circuit.

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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.2>Q 12
Consider an ac circuit where an incandescent light bulb is in series with an inductor. If the frequency of the generator is increased, what will happen to the brightness of bulb?