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) 0^{0}

b) 90^{0}

c) 180^{0}

d) 360^{0}

View Answer

Explanation: In a series RLC circuit, voltage across capacitor lag the current by 90

^{0}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 90

^{0}.

2. In a series RLC circuit, the phase difference between the voltage across the inductor and the voltage across the resistor is?

a) 0^{0}

b) 90^{0}

c) 180^{0}

d) 360^{0}

View Answer

Explanation: In a series RLC circuit, voltage across inductor lead the current by 90

^{0}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 90

^{0}.

3. In a series RLC circuit, the phase difference between the voltage across the capacitor and the voltage across the inductor is?

a) 0^{0}

b) 90^{0}

c) 180^{0}

d) 360^{0}

View Answer

Explanation: In a series RLC circuit, voltage across inductor lead the current by 90

^{0}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 180

^{0}.

4. In a series RLC circuit, the phase difference between the voltage across the resistor and the current in the circuit is?

a) 0^{0}

b) 90^{0}

c) 180^{0}

d) 360^{0}

View Answer

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) 0^{0}

b) 90^{0}

c) 180^{0}

d) 360^{0}

View Answer

Explanation: In a series RLC circuit, voltage across capacitor lag the current by 90

^{0}so, the phase difference between the voltage across the capacitor and current is 90

^{0}.

6. In a series RLC circuit, the phase difference between the voltage across the inductor and the current in the circuit is?

a) 0^{0}

b) 90^{0}

c) 180^{0}

d) 360^{0}

View Answer

Explanation: In a series RLC circuit, voltage across inductor lead the current by 90

^{0}so, the phase difference between the voltage across the inductor and the current is 90

^{0}.

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

View Answer

Explanation: The current in the inductor lags the voltage in a series RLC circuit if circuit is inductive dominant i.e. if X

_{L}> X

_{C}ωL > 1/ωC => ω > 1/√LC => ω > ω

_{0}. 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

View Answer

Explanation: The current in the capacitor leads the voltage in a series RLC circuit if circuit is capacitive dominant i.e. if X

_{L}< X

_{C}

ωL < 1/ωC => ω < 1/√LC => ω < ω

_{0}. 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.

a) Leads

b) Lags

c) Equal to

d) Depends on the circuit

View Answer

Explanation: ω > ω

_{0}=> ω > 1/√LC

=> ωL > 1/ωC => X

_{L}> X

_{C}

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.

a) Leads

b) Lags

c) Equal to

d) Depends on the circuit

View Answer

Explanation: ω < ω

_{0}=> ω < 1/√LC

=> ωL < 1/ωC => X

_{L}< X

_{C}The circuit is capacitive dominant so, the current in the capacitor leads the voltage in a series RLC circuit above the resonant frequency.

**Sanfoundry Global Education & Learning Series – Basic Electrical Engineering.**

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