250+ TOP MCQs on Series Resonance and Answers Quiz

Network Theory Multiple Choice Questions on “Series Resonance”.

1. 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

Answer: A
Clarification: The circuit is said to be in resonance if the current is in phase with the applied voltage and not if the current is out of phase with the applied voltage. The study of resonance is very useful particularly in the area of communications.

2. In a series resonance circuit, series resonance occurs when?
A. X_L = 1
B. X_C = 1
C. X_L = X_C
D. X_L = -X_C

Answer: C
Clarification: In a series resonance circuit, series resonance occurs when capacitive reactance is equal to the inductive reactance that is X_L = X_C.

3. As X_L = X_C in a series resonance circuit, the impedance is_________
A. purely capacitive
B. purely inductive
C. purely resistive
D. capacitive and inductive

Answer: C
Clarification: As X_L = X_C in a series resonance circuit, the impedance is purely resistive. In a series RLC circuit the current lags behind or leads the applied voltage depending on the values of X_L and X_C.

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

Answer: D
Clarification: At resonant frequency, the voltage across capacitor is equal to the voltage across inductor. If one of the parameters of the series RLC circuit is varied in such a way that the current in the circuit is in phase with the applied voltage, then the circuit is said to be in resonance.

5. 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

Answer: B
Clarification: In series RLC circuit, the voltage across capacitor and inductor are 180⁰ out of phase with each other. The frequency at which the resonance occurs is called resonant frequency.

6. The voltage across the LC combination in a series RLC circuit is?
A. 0
B. 1
C. 2
D. 3

Answer: A
Clarification: Since the voltage across capacitor and inductor are 180⁰ out of phase with each other, the voltage across the LC combination in a series RLC circuit is 0V.

7. 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.

Answer: D
Clarification: The expression of resonant frequency is resonant frequency = 1/(2π√LC.. In a series RLC circuit resonance may be produced by varying the frequency, keeping L and C constant.