# Chapter 4: Complex AC Circuits

21. When the supply frequency is more than the resonant frequency in a parallel a.c. circuit, then circuit is

... Answer is (C)

22. A parallel resonant circuit magnifies

... Answer is (A)

23. Dynamic impedance of a parallel tuned circuit is

A.

... Answer is (C)

24. When supply frequency is less than the resonant frequency is a parallel a.c. circuit, then circuit is

... Answer is (B)

25. At parallel resonance,
...
Answer is (B)

26. In a circuit element, the partial discharge is higher than the applied voltage of the source. That will be

... Answer is (C)

27. A lamp consumes 25% of peak power in an a.c. circuit. What is the phase difference between the applied voltage and circuit current?
/3
/4
/2

... Answer is (B)

28. In R-L-C series a.c. circuit, the current

A.

... Answer is (D)

29. An A.C source is in series with R and L. If the respective potential drops are 200 V and 150 V, the applied voltage is

... Answer is (B)

30.  In an R-L-C series circuit, the current through resistance and inductance has a phase difference of
/3
/4

... Answer is (D)

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