# Series Resonance MCQ’s

This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Series Resonance”.

1. In a series resonance circuit, series resonance occurs when?
a) XL = 1
b) XC = 1
c) XL = XC
d) XL = -XC

2. As XL = XC in a series resonance circuit, the impedance is_________
a) purely capacitive
b) purely inductive
c) purely resistive
d) capacitive and inductive

3. The circuit is said to be in resonance if the current is ____ with the applied voltage.
a) in phase
b) out of phase
c) 45⁰ out of phase
d) 90⁰ out of phase

4. At resonant frequency, the voltage across capacitor is _______ the voltage across inductor.
a) greater than
b) less than
c) greater than or equal to
d) equal to

5. The voltage across the LC combination in a series RLC circuit is?
a) 0
b) 1
c) 2
d) 3

6. For the circuit shown in figure determine the capacitive reactance at resonance.

a) 15
b) 20
c) 25
d) 30

7. In series RLC circuit, the voltage across capacitor and inductor are ______ with each other.
a) in phase
b) 180⁰ out of phase
c) 90⁰ out of phase
d) 45⁰ out of phase

8. The expression of resonant frequency in a series resonant circuit is?
a) 1/(2π√C)
b) 1/( 2π√L)
c) 2π√LC
d) 1/(2π√LC)

9. What is the value of the impedance at resonance in the circuit shown below?

a) 25
b) 50
c) 75
d) 100

10. Determine the resonant frequency (kHz) for the circuit shown below.

a) 2.25
b) 22.5
c) 225
d) 2250