# Basic Electrical Engineering Questions and Answers – Voltages in a Series RLC Circuit

This set of Basic Electrical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Voltages in a Series RLC Circuit”.

1. In a series RLC circuit, the phase difference between the voltage across the capacitor and the voltage across the resistor is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, voltage across capacitor lag the current by 900 and voltage across resistor is in phase with current so, the phase difference between the voltage across the capacitor and the voltage across the resistor is 900.

2. In a series RLC circuit, the phase difference between the voltage across the inductor and the voltage across the resistor is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, voltage across inductor lead the current by 900 and voltage across resistor is in phase with current so, the phase difference between the voltage across the inductor and the voltage across the resistor is 900.

3. In a series RLC circuit, the phase difference between the voltage across the capacitor and the voltage across the inductor is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, voltage across inductor lead the current by 900 and voltage across capacitor lag the current by 900 so, the phase difference between the voltage across the inductor and the voltage across the capacitor is 1800.

4. In a series RLC circuit, the phase difference between the voltage across the resistor and the current in the circuit is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, the phase difference between the voltage across the resistor and the current in the circuit is 0 degrees because they are in phase.

5. In a series RLC circuit, the phase difference between the voltage across the capacitor and the current in the circuit is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, voltage across capacitor lag the current by 900 so, the phase difference between the voltage across the capacitor and current is 900.
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6. In a series RLC circuit, the phase difference between the voltage across the inductor and the current in the circuit is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, voltage across inductor lead the current by 900 so, the phase difference between the voltage across the inductor and the current is 900.

7. The current in the inductor lags the voltage in a series RLC circuit ___________ resonant frequency.
a) Above
b) Below
c) Equal to
d) Depends on the circuit

Explanation: The current in the inductor lags the voltage in a series RLC circuit if circuit is inductive dominant i.e. if XL > XC ωL > 1/ωC => ω > 1/√LC => ω > ω0. So, the current in the inductor lags the voltage in a series RLC circuit above the resonant frequency.

8. The current in the capacitor leads the voltage in a series RLC circuit ___________ resonant frequency.
a) Above
b) Below
c) Equal to
d) Depends on the circuit

Explanation: The current in the capacitor leads the voltage in a series RLC circuit if circuit is capacitive dominant i.e. if XL < XC
ωL < 1/ωC => ω < 1/√LC => ω < ω0. So, the current in the capacitor leads the voltage in a series RLC circuit below the resonant frequency.

9. The current in the inductor ___________ the voltage in a series RLC circuit above the resonant frequency.
b) Lags
c) Equal to
d) Depends on the circuit

Explanation: ω > ω0 => ω > 1/√LC
=> ωL > 1/ωC => XL > XC
The circuit is inductive dominant so, the current in the inductor lags the voltage in a series RLC circuit above the resonant frequency.

10. The current in the capacitor ___________ the voltage in a series RLC circuit below the resonant frequency.
b) Lags
c) Equal to
d) Depends on the circuit

Explanation: ω < ω0 => ω < 1/√LC
=> ωL < 1/ωC => XL < XC The circuit is capacitive dominant so, the current in the capacitor leads the voltage in a series RLC circuit above the resonant frequency.

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