### Voltages in a Series RLC Circuit mcqs in basic electrical engineering.

In a series RLC circuit, the voltage across the resistor is in phase with:

a) The current

b) The voltage across the inductor

c) The voltage across the capacitor

d) The total applied voltage

Answer: a) The current

Explanation: In a series RLC circuit, the voltage across the resistor is in phase with the current flowing through the circuit.

The voltage across the inductor in a seres RLC circuit lags the current by:

a) 0 degrees

b) 45 degrees

c) 90 degrees

d) 180 degrees

Answer: c) 90 degrees

Explanation: The voltage across the inductor in a series RLC circuit lags the current by 90 degrees.

The voltage across the capacitor in a series RLC circuit leads the current by:

a) 0 degrees

b) 45 degrees

c) 90 degrees

d) 180 degrees

Answer: c) 90 degrees

Explanation: The voltage across the capacitor in a series RLC circuit leads the current by 90 degrees.

The sum of the voltages across the resistor, inductor, and capacitor in a series RLC circuit is equal to:

a) The total applied voltage

b) Zero

c) The current

d) The impedance

Answer: a) The total applied voltage

When the frequency of the applied voltage in a series RLC circuit is below the resonant frequency, the voltage across the capacitor is :

a) Larger than the voltage across the resistor

b) Smaller than the voltage across the resistor

c) Equal to the voltage across the resistor

d) Zero

Answer: a) Larger than the voltage across the resistor

When the frequency of the applied voltage in a series RLC circuit s above the resonant frequency, the voltage across the inductor is:

a) Larger than the voltage across the resistor

b) Smaller than the voltage across the resistor

c) Equal to the voltage across the resistor

d) Zero

Answer: a) Larger than the voltage across the resistor

Explanation: When the frequency is above the resonant frequency, the inductor behaves like an open circuit, causing a larger voltage drop across it compared to the resistor.

The voltage across the resistor in a series RLC circuit represents:

a) The active power

b) The reactive power

c) The apparent power

d) The total power

Answer: a) The active power

Explanation: The voltage across the resistor in a series RLC circuit represents the active power dissipated in the form of heat.

The voltage across the inductor in a series RLC circuit represents:

a) The reactive power

b) The active power

c) The apparent power

d) The total power

Answer: a) The reactive power

Explanation: The voltage across the inductor in a series RLC circuit represents the reactive power associated with the magnetic field.

The voltage across the capacitor in a series RLC circuit represents:

a) The reactive power

b) The active power

c) The apparent power

d) The total power

Answer: a) The reactive power

Explanation: The voltage across the capacitor in a series RLC circuit represents the reactive power associated with the electric field.

The phase angle between the voltage across the resistor and the current in a series RLC circuit is:

a) 0 degrees

b) 45 degrees

c) 90 degrees

d) 180 degrees

Answer: a) 0 degrees

Explanation: The voltage across the resistor in a series RLC circuit is in phase with the current.

The phase angle between the voltage across the inductor and the current in a series RLC circuit is:

a) 0 degrees

b) 45 degrees

c) 90 degrees

d) 180 degrees

Answer: b) 45 degrees

Explanation: The voltage across the inductor in a series RLC circuit lags the current by 45 degrees.

The phase angle between the voltage across the capacitor and the current in a series RLC circuit is:

a) 0 degrees

b) 45 degrees

c) 90 degrees

d) 180 degrees

Answer: c) 90 degrees

Explanation: The voltage across the capacitor in a series RLC circuit leads the current by 90 degrees.

The voltage across the resistor in a series RLC circuit is affected by:

a) Resistance only

b) Inductance only

c) Capacitance only

d) Resistance, inductance, and capacitance

Answer: d) Resistance, inductance, and capacitance

Explanation: The voltage across the resistor in a series RLC circuit is influenced by all three components: resistance, inductance, and capacitance.

When the resistance in a series RLC circuit is increased, the voltage across the resistor:

a) Increases

b) Decreases

c) Remains the same

d) Cannot be determined

Answer: a) Increases

When the inductance in a series RLC circuit is increased , the voltage across the inductor:

a) Increases

b) Decreases

c) Remains the same

d) Cannot be determined

Answer: a) Increases

When the capacitance in a series RLC circuit is increased, the voltage across the capacitor:

a) Increases

b) Decreases

c) Remains the same

d) Cannot be determined

Answer: a) Increases

The voltage across the resistor, inductor, and capacitor in a series RLC circuit can be calculated using:

a) Ohm’s Law

b) Kirchhoff’s Voltage Law

c) Kirchhoff’s Current Law

d) The power formula

Answer: b) Kirchhoff’s Voltage Law

The voltage across the resistor, inductor, and capacitor in a series RLC circuit depends on the:

a) Frequency of the applied voltage

b) Voltage source

c) Power factor

d) Amplitude of the current

Answer: a) Frequency of the applied voltage

The voltage across the resistor, inductor, and capacitor in a series RLC circuit is maximum at:

a) Resonance

b) Lower frequencies

c) Higher frequencies

d) It remains constant regardless of the frequency

Answer: a) Resonance

Explanation: The voltage across the resistor, inductor, and capacitor in a series RLC circuit is maximum at the resonant frequency

The voltage across the resistor in a series RLC circuit represents:

a) Real power

b) Reactive power

c) Apparent power

d) Total power

Answer: a) Real power

Explanation: The voltage across the resistor in a series RLC circuit represents the real power dissipated in the circuit.