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Electrical Engineering
RC Circuits
Quiz 2
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Q.1
The capacitor voltage always leads the current by 90°.
True
False
Q.2
In the complex plane, the number 14 - j5 is located in the Fourth quadrant
True
False
Q.3
The resistor voltage is always out of phase with the current.
True
False
Q.4
When the frequency of the voltage applied to a series RC circuit is increased, the phase angle
Increases
Decreases
Remains the same
Becomes erratic
Q.5
A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is
Z = 47 Ω + j150 Ω
Z = 47 Ω - j150 Ω
Z = 197 Ω
Z = 103 Ω
Q.6
Complex numbers can be added and subtracted but not multiplied or divided.
True
False
Q.7
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 ∠0° mA, what is the source voltage expressed in polar form?
45.6 V
411.3 V
0.411 V
4.11 V
Q.8
An imaginary number is one that exists only in the mind of the mathematician.
True
False
Q.9
For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
19.52 W
195.2 W
275 W
25 W
Q.10
Positive numbers can be represented by points to the right of the origin on the horizontal axis of a graph.
True
False
Q.11
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
Q.12
The impedance of a series RC circuit varies directly with frequency.
True
False
Q.13
When the frequency of the voltage applied to a series RC circuit is decreased, the impedance
Increases
Decreases
Remains the same
Doubles
Q.14
Total current in an RC circuit always leads the source voltage.
True
False
Q.15
The complex number 40 ∠ 55° is equivalent to
55 + j55
40 + j40
45.88 + j65.52
22.94 + j32.76
Q.16
A 120 Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance?
37.9 Ω
3.7 Ω
14,400 Ω
4,800 Ω
Q.17
A 2 kΩ resistor and a 0.002 µF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is
84.5 mW
845 mW
13 mW
130 mW
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