**Series AC Circuits Electrical Engineering MCQ Questions Answers**

Series AC circuits play a pivotal role in understanding the behavior of electrical systems. They are fundamental to various applications, ranging from power distribution to electronic devices. This article aims to test and enhance your knowledge of series AC circuits through a set of multiple-choice questions (MCQs) and their comprehensive answers.

1) **Impedance of an a.c. circuit is a ________________.**

a) phasor

b) vector quantity

c) scalar quantity

d) none of the above

2) **The active and apparent powers of an a.c. circuit are equal in magnitude. The circuit power factor is …….**

a) o.707

b) 0.5

c) 0.8

d)1

3) **The power factor of a.c. circuit is ………..**

a) 0

b) 1

c) -1

d) none of the above

4) **A series resonant circuit magnifies …………**

a) voltage

b) current

c) both voltage and current

d) none of the above

5) **The Q factor of a coil is given by ……..**

a) R/X_{L}

b) I/X_{L}

c) I/R

d) X_{L}/R

6) **Dynamic impedance of a parallel tuned circuit is …………**

a) L/CR

b) RL/C

c) L/C

d) R/L

7) **Power factor of a circuit can be improved by the use of**

a) choke coil

b) capacitor

c) induction motor

d) none of the above

8) **Wattless current is said of flow when phase angle between voltage and current is**

a) 90^{0}

b) 0^{0}

c) 60^{0}

d) 180^{0}

9) **In the above question, what is the true power supplied to the circuit ?**

a) 9 W

b) 18 W

c) 4.5 W

d) 36.8 W

10) **In an R-L series a.c. circuit XL=R. the phase angle is**

a) 90^{0}

b) 30^{0}

c) 45^{0}

d) cannot be predicted