RC CIRCUITS QUIZ

What is the angular difference between +j4 and –j4?

90°

180°

270°

30°

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A capacitor with 150Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is

Z = 150 –90° Ω

Z = 150 angle – 90° Ω

Z = 150

Z = 150 angle 180° Ω

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When the frequency of the voltage applied to a series RC circuit is decreased, the impedance

remains the same

increases

decreases

doubles

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The complex number 40 angle 55° is equivalent to

40 + j40

55 + j55

22.94 + j32.76

45.88 + j65.52

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A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is

460 mA

4.6 mA

92 mA

9.2 mA

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

does not change

decreases

increases

decreases to zero

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Point +4 on the complex plane is

4 units left of the origin on the real axis

4 units below the origin on the j axis

4 units right of the origin on the real axis

4 units above the origin on the j axis

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In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is

19.2 V

3 V

1.9 V

27 V

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When the frequency of the voltage applied to a series RC circuit is increased, the phase angle

becomes erratic

remains the same

increases

decreases

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

–180°

–60°

–30°

–330°

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