# Chapter 4: Complex AC Circuits

31. A series LC circuit is resonant at 150 kHz and has a Q of 50. What is the bandwidth?

32. In a series RL circuit supplied with 50 V, the circuit current is measured as 100 mA with a phase angle of 25°. What is the reactive power supplied to the circuit?

33. A coil when connected to an a.c. supply of 200 V, 50 Hz takes 2 A. The power consumed is 200 W. The circuit power factor is

A.

34. If a phasor is multiplied by j, then

35. The difference of two conjugate numbers results in
...

36. The two complex number are given as : 5(cos30° +j sin30°); 10(cosI5° + j sin15°) The value of product of these two numbers is equal to
° + j sin 45° +j sin 15° +j sin 450

37. The conductance and susceptance components of admittance are

38. The Q-factor of a parallel resonant circuit is given by

A.

39. At parallel resonance, the circuit draws a current of 2 mA. If the Q of he circuit is 100, then current through the capacitor is

40.  In a parallel RC circuit with R> Xc, the phase angle will be

Page 4 of  17

Pages   1  2  3  4  5  6  7 8  9  10  11 12 13 14 15 16 17
Share: