Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 51

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In a pure inductive circuit or in an A.C. circuit containing inductance only, the current,

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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 52

A series combination of

R, L, C

is connected to an a.c. source. If the resistance is

3 Ω

and the reactance is

4 Ω,

the power factor of the circuit is

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 53

A

12 Ω

resistor and a

0.21 H

inductor are connected in series to an AC source operating at

20 V, 50 Hz

. The phase angle between the current and the source voltage is

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 54

When

100 V DC

is applied across a solenoid, a steady current of

1 A

flows in it. When

100 V AC

is applied across the same solenoid, the current drops to

0.5 A

. If the frequency of the

AC

source is

150 \sqrt{3} / π Hz

, the impedance and inductance of the solenoid are:

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 55

If in a series

L C R

AC circuit, the rms voltage across

L, C

and

R

are

V_{1}, V_{2}

and

V_{3}

respectively, then the voltage of the source is always:

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 56

In the series $L C R$ circuit as shown in figure, the voltmeter and ammeter readings are :

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 57

An A.C. voltage source of variable angular frequency

ω

and fixed amplitude

V

connected in series with a capacitance

C

and an electric bulb of resistance

R

(inductance zero). When

ω

is increased,

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 58

In a circuit,

L, C

and

R

are connected in series with an alternating voltage source of frequency

f .

The current leads the voltage by

45 ° .

The value of

C

is ?

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 59

In an

L C R

series A.C. circuit, the voltage across each of the components inductor

L, capacitor C and resistor R

is

50 V

. The voltage across the L.C. combination will be,