RC Circuits Objective Questions and Answers - Set 01 - ObjectiveBooks

RC Circuits Objective Questions and Answers - Set 01

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 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?
    (A) 37.9 Ω
    (B) 3.7 Ω
    (C) 14,400 Ω
    (D) 4,800 Ω

6. A capacitor with 150 Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
    (A) Z = 150
    (B) Z = 150 ∠90°Ω
    (C) Z = 150 ∠-90°Ω
    (D) Z = 150 ∠180°Ω

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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