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RL Circuits MCQ Questions & Answers | Electrical Engineering

Learn RL Circuits MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. RL Circuits MCQ question is the important chapter for a Electrical Engineering and GATE students. Page-2 section-1

11
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
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Answer & Solution
Answer: Option B
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12
When the frequency of the voltage applied to a series RL circuit is decreased, the impedance
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Answer & Solution
Answer: Option A
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13
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
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Answer: Option A
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14
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
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Answer: Option D
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15
If a load is purely inductive and the reactive power is 12 VAR, the apparent power is
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Answer: Option B
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16
In a series RL circuit, 12 V rms is measured across the resistor and 14 V rms is measured across the inductor. The peak value of the source voltage is
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Answer & Solution
Answer: Option B
Solution:
$$\eqalign{ & {{\text{E}}_{{\text{rms}}}} = \sqrt {{\text{V}}_{\text{L}}^2} + {\text{V}}_{\text{R}}^2 \cr & \Rightarrow {{\text{E}}_{{\text{rms}}}} = \sqrt {{{12}^2}} + {14^2} = \sqrt {340{\text{V}}} \cr & {{\text{E}}_{{\text{max}}}} = {{\text{E}}_{{\text{rms}}}}\sqrt 2 \cr & {{\text{E}}_{{\text{max}}}} = \sqrt {680{\text{V}}} \cr & \Rightarrow {{\text{E}}_{{\text{max}}}} = 26.0\,{\text{V}} \cr} $$
17
In an RL circuit, part of the power is resistive and part is reactive.
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Answer: Option A
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18
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
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Answer: Option A
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19
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
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Answer: Option D
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20
The power factor indicates how much of the apparent power is reactive power.
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Answer: Option B
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