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RC Circuits

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

25 W
195.2 W
19.52 W
275 W

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RC Circuits
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
318.3
3.14 mS + j2.12 mS
212

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RC Circuits
The complex number 40 angle 55° is equivalent to

55 + j55
22.94 + j32.76
40 + j40
45.88 + j65.52

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

is reduced to one-fourth
cannot be determined without values
doubles
is halved

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

90°
180°
270°
30°

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RC Circuits
A 47Ω resistor and a capacitor with 150Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is

Z = 47Ω – j150Ω
Z = 103Ω
Z = 197Ω
Z = 47Ω + j150Ω

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