250+ TOP MCQs on The Current in a Series RLC Circuit and Answers

Basic Electrical Engineering Multiple Choice Questions on “The Current in a Series RLC Circuit”.

1. In a series RLC circuit, the phase difference between the current in the capacitor and the current in the resistor is?
A. 0⁰
B. 90⁰
C. 180⁰
D. 360⁰
Answer: A
Clarification: In a series RLC circuit, the phase difference between the current in the capacitor and the current in the resistor is 0⁰ because same current flows in the capacitor as well as the resistor.

2. In a series RLC circuit, the phase difference between the current in the inductor and the current in the resistor is?
A. 0⁰
B. 90⁰
C. 180⁰
D. 360⁰
Answer: A
Clarification: In a series RLC circuit, the phase difference between the current in the inductor and the current in the resistor is 0⁰ because same current flows in the inductor as well as the resistor.

3. In a series RLC circuit, the phase difference between the current in the capacitor and the current in the inductor is?
A. 0⁰
B. 90⁰
C. 180⁰
D. 360⁰
Answer: A
Clarification: In a series RLC circuit, the phase difference between the current in the inductor and the current in the capacitor is 0⁰ because same current flows in the inductor as well as the capacitor.

4. In a series RLC circuit, the phase difference between the current in the circuit and the voltage across the resistor is?
A. 0⁰
B. 90⁰
C. 180⁰
D. 360⁰
Answer: A
Clarification: In a series RLC circuit, the phase difference between the voltage across the resistor and the current in the circuit is 0⁰ because they are in phase.

5. In a series RLC circuit, the phase difference between the current in the circuit and the voltage across the capacitor is?
A. 0⁰
B. 90⁰
C. 180⁰
D. 360⁰
Answer: B
Clarification: In a series RLC circuit, voltage across capacitor lags the current in the circuit by 90⁰ so, the phase difference between the voltage across the capacitor and the current in the circuit is 90⁰.

6. _________ the resonant frequency, the current in the inductor lags the voltage in a series RLC circuit.
A. Above
B. Below
C. Equal to
D. Depends on the circuit
Answer: A
Clarification: The current in the inductor lags the voltage in a series RLC circuit if a circuit is inductive dominant i.e. if X_L > X_C
ω_L > 1/ω_C => ω > 1/√LC => ω > ω₀.
So, the current in the inductor lags the voltage in a series RLC circuit above the resonant frequency.

7. _________ the resonant frequency, the current in the capacitor leads the voltage in a series RLC circuit.
A. Above
B. Below
C. Equal to
D. Depends on the circuit
Answer: B
Clarification: The current in the capacitor leads the voltage in a series RLC circuit if circuit is capacitive dominant i.e.i.e. if X_L < X_C
ω_L < 1/ω_C => ω < 1/√LC => ω < ω₀.
So, the current in the capacitor leads the voltage in a series RLC circuit below the resonant frequency.