Rl Circuits MCQs with Explanations

$$\eqalign{ & {{\text{E}}_{{\text{rms}}}} = \sqrt {{\text{V}}_{\text{L}}^2} + {\text{V}}_{\text{R}}^2 \cr & \Rightarrow {{\text{E}}_{{\text{rms}}}} = \sqrt {{{12}^2}} + {14^2} = \sqrt {340{\text{V}}} \cr & {{\text{E}}_{{\text{max}}}} = {{\text{E}}_{{\text{rms}}}}\sqrt 2 \cr & {{\text{E}}_{{\text{max}}}} = \sqrt {680{\text{V}}} \cr & \Rightarrow {{\text{E}}_{{\text{max}}}} = 26.0\,{\text{V}} \cr} $$

Cannot be determined without values is the correct answer to “If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit”. This question is standard in competitive examination syllabi for Rl Circuits.

True is the correct answer to “A filter passes certain frequencies and rejects others.”. This question is standard in competitive examination syllabi for Rl Circuits.

True is the correct answer to “When the frequency of the voltage applied to a series RL circuit is decreased, the impedance decreases”. This question is standard in competitive examination syllabi for Rl Circuits.

Decreases is the correct answer to “When the frequency is decreased, the impedance of a parallel RL circuit”. This question is standard in competitive examination syllabi for Rl Circuits.

True is the correct answer to “In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined.”. This question is standard in competitive examination syllabi for Rl Circuits.

0.564 is the correct answer to “A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is”. This question is standard in competitive examination syllabi for Rl Circuits.

True is the correct answer to “Total current in an RL circuit always lags the source voltage.”. This question is standard in competitive examination syllabi for Rl Circuits.

Increases is the correct answer to “When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle”. This question is standard in competitive examination syllabi for Rl Circuits.

True is the correct answer to “The phase angle (θ) of a series RL circuit varies directly with frequency.”. This question is standard in competitive examination syllabi for Rl Circuits.

55.15 Ω is the correct answer to “A 140 Ω resistor is in parallel with an inductor having 60 Ω inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is”. This question is standard in competitive examination syllabi for Rl Circuits.

1,526 Ω is the correct answer to “A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is”. This question is standard in competitive examination syllabi for Rl Circuits.

Decreases is the correct answer to “When the frequency of the voltage applied to a series RL circuit is decreased, the impedance”. This question is standard in competitive examination syllabi for Rl Circuits.

3.84 ∠20.6° V is the correct answer to “A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 ∠0° mA. The source voltage, expressed in polar form, is”. This question is standard in competitive examination syllabi for Rl Circuits.

129 ∠68.6° Ω is the correct answer to “A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is”. This question is standard in competitive examination syllabi for Rl Circuits.

12 VA is the correct answer to “If a load is purely inductive and the reactive power is 12 VAR, the apparent power is”. This question is standard in competitive examination syllabi for Rl Circuits.

True is the correct answer to “In an RL circuit, part of the power is resistive and part is reactive.”. This question is standard in competitive examination syllabi for Rl Circuits.

8.74 mA is the correct answer to “A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is”. This question is standard in competitive examination syllabi for Rl Circuits.

120 mA is the correct answer to “A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is”. This question is standard in competitive examination syllabi for Rl Circuits.

False is the correct answer to “The power factor indicates how much of the apparent power is reactive power.”. This question is standard in competitive examination syllabi for Rl Circuits.

Should be decreased is the correct answer to “To increase the current in a series RL circuit, the frequency”. This question is standard in competitive examination syllabi for Rl Circuits.

False is the correct answer to “When the frequency is decreased, the impedance of a parallel RL circuit Increases”. This question is standard in competitive examination syllabi for Rl Circuits.

False is the correct answer to “The resistor voltage in an RL circuit is always out of phase with the current.”. This question is standard in competitive examination syllabi for Rl Circuits.

Increases is the correct answer to “When the frequency of the voltage applied to a series RL circuit is increased, the phase angle”. This question is standard in competitive examination syllabi for Rl Circuits.

False is the correct answer to “The impedance of an RL circuit varies inversely with frequency.”. This question is standard in competitive examination syllabi for Rl Circuits.

0.2 is the correct answer to “Which of the following power factors results in less energy loss in an RL circuit”. This question is standard in competitive examination syllabi for Rl Circuits.

12.18 ∠-76° mS is the correct answer to “A 470 Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is”. This question is standard in competitive examination syllabi for Rl Circuits.

4.24 A is the correct answer to “In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is”. This question is standard in competitive examination syllabi for Rl Circuits.

False is the correct answer to “A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit.”. This question is standard in competitive examination syllabi for Rl Circuits.