Rc Circuits(Electrical Engineering ) Questions and Answers
Question 1. A positive angle of 30° is equivalent to a negative angle of
-30°
-330°
-60°
-180°
Explanation:-
Answer: Option B. -> -330°
Question 2. Apparent power is expressed in watts.
True
False
Explanation:-
Answer: Option B. -> False
Question 3. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
Increases
Decreases
Does not change
Decreases to zero
Explanation:-
Answer: Option A. -> Increases
Question 4. The complex number 6 + j6 is equivalent to
6 ∠45°
36 ∠45°
8.48 ∠45°
8.48 ∠90°
Explanation:-
Answer: Option C. -> 8.48 ∠45°
Question 5. In an RC circuit, the impedance is determined by both the resistance and the capacitive reactance combined.
True
False
Explanation:-
Answer: Option A. -> True
Question 6. 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
Explanation:-
Answer: Option D. -> Cannot be determined without values
Question 7. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance
Increases
Decreases
Remains the same
Doubles
Explanation:-
Answer: Option A. -> Increases
Question 8. What is the angular difference between +j4 and -j4?
30°
90°
180°
270°
Explanation:-
Answer: Option C. -> 180°
Question 9. The impedance of a series RC circuit varies directly with frequency.
True
False
Explanation:-
Answer: Option B. -> False
Question 10. 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?
