RC CIRCUITS QUIZ

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

–180°

–60°

–330°

–30°

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A 12 kΩ resistor is in series with a 0.02 μF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 angle 0° mA, what is the source voltage expressed in polar form?

4.11 V

0.411 V

45.6 V

411.3 V

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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 right of the origin on the real axis

4 units left of the origin on the real axis

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What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?

21.63

3.46

4.24

2.16

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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 180° Ω

Z = 150

Z = 150 angle – 90° Ω

Z = 150 –90° Ω

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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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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

318.3

3.14 mS + j2.12 mS

212

2.12 mS + j3.14 mS

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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

3 V

1.9 V

19.2 V

27 V

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In a series RC circuit, when the frequency and the resistance are halved, the impedance

is reduced to one-fourth

is halved

cannot be determined without values

doubles

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

first quadrant

third quadrant

fourth quadrant

second quadrant

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