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A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitive reactance 25 Ω. The combination is connected to an A.C. source of 110 V. The power factor of the circuit is:

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Important Questions on Alternating Current

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 36
A circuit has a resistance of 12 Ω and an impedance of 15 Ω . The power factor of the circuit will be  
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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 37
Coil of inductance 5.0 mH and negligible resistance is connected to an alternating voltage V=10 sin(100t) V. The peak current in the circuit will be:
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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 38
A resistor and a capacitor are connected to an AC supply of 200 volt, 50 Hz in series. The current in the circuit is 2 ampere. If the power consumed in the circuit is 100 watt, then the resistance in the circuit is:
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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 39
The impedance of a series circuit consist of 3 ohm resistance and 4 ohm reactance. The power factor
of the circuit is,
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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 40
In series A series LCR circular in connected to a.c. source of variable frequency f The graphical representation of variation of impedance z of the circuit with frequency f will be
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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 41
With increase in frequency of an AC suppiy, the inductive reactance:
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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 42
With increase in frequency of an AC supply, the capacitive reactance,
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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 43
In an AC circuit consisting of resistance R and inductance L, the voltage across R is 60 V and that across L is 80 V. The total voltage across the combination is,