RC Circuits MCQ Questions & Answers | Electrical Engineering

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1.
A positive angle of 30° is equivalent to a negative angle of

A. -30°

B. -330°

C. -60°

D. -180°

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2.
Apparent power is expressed in watts.

A. True

B. False

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3.
The complex number 6 + j6 is equivalent to

A. 6 ∠45°

B. 36 ∠45°

C. 8.48 ∠45°

D. 8.48 ∠90°

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4.
When the frequency of the source voltage decreases, the impedance of a parallel RC circuit

A. Increases

B. Decreases

C. Does not change

D. Decreases to zero

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5.
In an RC circuit, the impedance is determined by both the resistance and the capacitive reactance combined.

A. True

B. False

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6.
The capacitor voltage always leads the current by 90°.

A. True

B. False

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7.
In the complex plane, the number 14 - j5 is located in the Fourth quadrant

A. True

B. False

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8.
Total current in an RC circuit always leads the source voltage.

A. True

B. False

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9.
The complex number 40 ∠ 55° is equivalent to

A. 55 + j55

B. 40 + j40

C. 45.88 + j65.52

D. 22.94 + j32.76

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10.
A 2 kΩ resistor and a 0.002 µF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is

A. 84.5 mW

B. 845 mW

C. 13 mW

D. 130 mW

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