RC Circuits Objective Questions and Answers - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
(A) Increases
(B) Decreases
(C) Does not change
(D) Decreases to zero

2. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
(A) R = XC
(B) R > XC
(C) R < XC
(D) R = 5XC

3. In a series RC circuit, when the frequency and the resistance are halved, the impedance
(A) Doubles
(B) Is halved
(C) Is reduced to one-fourth
(D) Cannot be determined without values

4. The impedance of a series RC circuit varies directly with frequency.
(A) True
(B) False

5. A 120 Î© resistor is in parallel with a capacitor with a capacitive reactance of 40 Î©. Both components are across a 12 V ac source. What is the magnitude of the total impedance?

6. A capacitor with 150 Î© of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
(A) Z = 150

7. When the frequency of the voltage applied to a series RC circuit is increased, the phase angle
(A) Increases
(B) Decreases
(C) Remains the same
(D) Becomes erratic

8. The complex number 6 + j6 is equivalent to
(A) 6 ∠45°
(B) 36 ∠45°
(C) 8.48 45°
(D) 8.48 ∠90°

9. Complex numbers can be added and subtracted but not multiplied or divided.
(A) True
(B) False

10. In the complex plane, the number 14 - j5 is located in the Fourth quadrant
(A) True
(B) False

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