# 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?

... Answer is (C)

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?

... Answer is (D)

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.

... Answer is (C)

34. If a phasor is multiplied by j, then

... Answer is (B)

35. The difference of two conjugate numbers results in
...
Answer is (A)

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

... Answer is (A)

37. The conductance and susceptance components of admittance are

... Answer is (B)

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

A.

... Answer is (B)

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

... Answer is (B)

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

... Answer is (B)

Page 4 of  17

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