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RC Circuits
Quiz 1
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Q.1
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
200 mA
100 mA
282 mA
141 mA
Q.2
In a lag network, the output voltage lags the input voltage in phase.
True
False
Q.3
A 470 Ω resistor and a 0.2 µF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is
212 Ω
2.12 mS + j3.14 mS
3.14 mS + j2.12 mS
318.3 Ω
Q.4
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
27 V
19.2 V
1.9 V
Q.5
An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
R = XC
R > XC
R < XC
R = 5XC
Q.6
A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z?
129 Ω
12.9 Ω
167 Ω
73 Ω
Q.7
In the complex plane, the number 4 + j3 is located in the
First quadrant
Second quadrant
Third quadrant
Fourth quadrant
Q.8
A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is
0 Hz
12 kHz
6 kHz
18 kHz
Q.9
A complex number represents a phasor quantity.
True
False
Q.10
A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is
9.2 mA
92 mA
4.6 mA
460 mA
Q.11
The power factor (PF) indicates how much of the apparent power is true power.
True
False
Q.12
In the complex plane, the number 14 - j5 is located in the
First quadrant
Second quadrant
Third quadrant
Fourth quadrant
Q.13
The polar form of a complex number consists of a real part and a j part.
True
False
Q.14
The circuit phase angle is the angle between the total current and the applied (source) voltage.
True
False
Q.15
A capacitor with 150 Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
Z = 150
Z = 150 ∠90°O
Z = 150 ∠-90°O
Z = 150 ∠180°O
Q.16
A filter passes all frequencies.
True
False
Q.17
What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?
4.24
3.46
2.16
21.63
Q.18
In a series RC circuit, when the frequency and the resistance are halved, the impedance
Doubles
Is halved
Is reduced to one-fourth
Cannot be determined without values
Q.19
A 2 kΩ resistor is in series with a 0.015 µF capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?
73.4 Ω and ∠ = -19.5°
707 Ω and ∠ = -19.5°
2121 Ω and ∠ = -19.5°
734 Ω and ∠ = -38.9°
Q.20
What is the angular difference between +j4 and -j4?
30°
90°
180°
270°
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