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MCQs

Total Questions : 90 | Page 4 of 9 pages
Question 31. A 470 Ω resistor and a 0.2 µF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is
  1.    212 Ω
  2.    2.12 mS + j3.14 mS
  3.    3.14 mS + j2.12 mS
  4.    318.3 Ω
 Discuss Question
Answer: Option B. -> 2.12 mS + j3.14 mS
Question 32. When the frequency of the voltage applied to a series RC circuit is increased, the phase angle
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes erratic
 Discuss Question
Answer: Option B. -> Decreases
Question 33. The resistor voltage is always out of phase with the current.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 34. A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is
  1.    0 Hz
  2.    12 kHz
  3.    6 kHz
  4.    18 kHz
 Discuss Question
Answer: Option C. -> 6 kHz
Question 35. A complex number represents a phasor quantity.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 36. A filter passes all frequencies.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 37. What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?
  1.    4.24
  2.    3.46
  3.    2.16
  4.    21.63
 Discuss Question
Answer: Option D. -> 21.63
Question 38. Positive numbers can be represented by points to the right of the origin on the horizontal axis of a graph.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 39. Point +4 on the complex plane is
  1.    4 units above the origin on the j axis
  2.    4 units below the origin on the j axis
  3.    4 units right of the origin on the real axis
  4.    4 units left of the origin on the real axis
 Discuss Question
Answer: Option C. -> 4 units right of the origin on the real axis
Question 40. 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?
  1.    37.9 Ω
  2.    3.7 Ω
  3.    14,400 Ω
  4.    4,800 Ω
 Discuss Question
Answer: Option A. -> 37.9 Ω

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