RC CIRCUITS QUIZ

In the complex plane, the number 14 – j5 is located in the

fourth quadrant

first quadrant

second quadrant

third quadrant

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

270°

30°

90°

180°

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For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is

25 W

19.52 W

195.2 W

275 W

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Point +4 on the complex plane is

4 units above the origin on the j axis

4 units below the origin on the j axis

4 units left of the origin on the real axis

4 units right of the origin on the real axis

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In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

141 mA

200 mA

282 mA

100 mA

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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 angle – 90° Ω

Z = 150 angle 180° Ω

Z = 150 –90° Ω

Z = 150

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A 470 resistor and a 0.2 F capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is

2.12 mS + j3.14 mS

3.14 mS + j2.12 mS

318.3

212

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A 2 k resistor is in series with a 0.015 F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?

734 and θ = –38.9°

707 and θ = –19.5°

73.4 and θ = –19.5°

2121 and θ = –19.5°

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The complex number 40 angle 55° is equivalent to

45.88 + j65.52

55 + j55

22.94 + j32.76

40 + j40

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

increases

decreases

does not change

decreases to zero

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