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# Alternating Current

#### Multiple Choice Questions

111.

In the given circuit, the AC source has ω = 100 rad/s, considering the inductor and capacitor to be ideal,

• the current through the circuit  is 0.4 A

• the current through the circuit is 0.3$\sqrt{2}$ A

• the voltage across 100 Ω  resistor is 10$\sqrt{2}$ V

• the voltage across 50 Ω resistor is 10 V

C.

the voltage across 100 Ω  resistor is 10$\sqrt{2}$ V

In R-C circuit

112.

An inductor 20 mH, a capacitor 100 µF and a resistor 50 Ω are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is

• 0.79 W

• 0.43

• 1.13

• 2.74 W

A.

0.79 W

Power dissipated in an LCR series connected to an a.c source of emf E

113.

Given,

R1 = 10 Ω, C1 = 2µF, R2 = 20 and C2 =  4F

The time constants (in µs) for the circuits I, II, III are respectively.

• 18, 18/9, 4

• 4, 8/9, 18

• 18, 4, 8/9

• 8/9, 18, 4

D.

8/9, 18, 4