HARD

12th CBSE

IMPORTANT

Earn 100

An a.c. source of $100 V$ r.m.s., $50 H z$ is connected across a $20 Ω$ resistor and $2 m H$ inductor in series Calculate (i) impedance of the circuit and (ii) r.m.s. current in the circuit.

Important Questions on Alternating Current and Electrical Machines

HARD

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 4

100 V

50 H z

a.c. source is connected to a series combination of an inductance of

100 m H

and a resistance of

20 Ω

. Calculate the magnitude and phase of the current.

HARD

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 5

A current of

11 A

flows through a coil, when connected to a

110 V

d.c. source. When

110 V

a.c. of

50 H z

is applied to the coil, only

0.5 A

current flows. Calculate the (i) resistance (ii) impedance and (iii) inductance of the coil.

HARD

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 6

An arc takes a current of

10 A

80 V

. Find the inductance, which should be put in series to work the arc from

220 V

50 H z

supply.

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 7

A current of $2.0 A$ is flowing in the LR-circuit shown in figure. Find the voltage across the a.c. source and the impedance of the circuit.
Question Image

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 8

Calculate the impedance and the rms current in the a.c. circuit shown in figure.
Question Image

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 9

The virtual current in the a.c. circuit shown in Figure, is $1.0 A$ . Find (i) virtual voltage across the coil $L$ (ii) impedance of the circuit and (iii) reactance of the coil.

Question Image

HARD

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 10

A circuit containing a resistance of

50 Ω

and an inductance of

(1 / π)

H in series is connected to a

200 V

a.c. line of frequency

60 H z

. Find the reactance, the impedance, the current in the circuit and the phase difference between the alternating voltage and current.

HARD

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 11

An a.c. circuit consists of a

220 V,

50 H z

supply connected across a

100 Ω

resistor. What inductance should be connected in the circuit in series with resistance so that the current is reduced to half?

An a.c. source of 100V r.m.s., 50Hz is connected across a 20Ω resistor and 2mH inductor in series Calculate (i) impedance of the circuit and (ii) r.m.s. current in the circuit.

Important Questions on Alternating Current and Electrical Machines

Learn and Prepare for any exam you want !

An a.c. source of $100 V$ r.m.s., $50 H z$ is connected across a $20 Ω$ resistor and $2 m H$ inductor in series Calculate (i) impedance of the circuit and (ii) r.m.s. current in the circuit.