Rc Circuits(Engineering > Electrical Engineering ) Questions and Answers

Question 1. A positive angle of 30° is equivalent to a negative angle of
  1.    -30°
  2.    -330°
  3.    -60°
  4.    -180°
Explanation:-
Answer: Option B. -> -330°
Question 2. Apparent power is expressed in watts.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 3. The complex number 6 + j6 is equivalent to
  1.    6 ∠45°
  2.    36 ∠45°
  3.    8.48 ∠45°
  4.    8.48 ∠90°
Explanation:-
Answer: Option C. -> 8.48 ∠45°
Question 4. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
  1.    Increases
  2.    Decreases
  3.    Does not change
  4.    Decreases to zero
Explanation:-
Answer: Option A. -> Increases
Question 5. In an RC circuit, the impedance is determined by both the resistance and the capacitive reactance combined.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 6. The capacitor voltage always leads the current by 90°.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 7. In the complex plane, the number 14 - j5 is located in the Fourth quadrant
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 8. Total current in an RC circuit always leads the source voltage.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 9. The complex number 40 ∠ 55° is equivalent to
  1.    55 + j55
  2.    40 + j40
  3.    45.88 + j65.52
  4.    22.94 + j32.76
Explanation:-
Answer: Option D. -> 22.94 + j32.76
Question 10. 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
  1.    84.5 mW
  2.    845 mW
  3.    13 mW
  4.    130 mW
Explanation:-
Answer: Option A. -> 84.5 mW
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