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MCQs

Total Questions : 90 | Page 6 of 9 pages
Question 51. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
  1.    increases
  2.    does not change
  3.    decreases to zero
  4.    decreases
 Discuss Question
Answer: Option A. -> increases
Question 52. The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency
  1.    has no effect
  2.    must be decreased
  3.    is held constant
  4.    must be increased
 Discuss Question
Answer: Option B. -> must be decreased
Question 53. What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?
  1.    21.63
  2.    3.46
  3.    4.24
  4.    2.16
 Discuss Question
Answer: Option A. -> 21.63
Question 54. The complex number 6 + j6 is equivalent to
  1.    645°
  2.    3645°
  3.    8.4890°
  4.    8.4845°
 Discuss Question
Answer: Option D. -> 8.4845°
Question 55. In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is
  1.    282 mA
  2.    141 mA
  3.    200 mA
  4.    100 mA
 Discuss Question
Answer: Option B. -> 141 mA
Question 56. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
  1.    R = XC
  2.    R < XC
  3.    R > XC
  4.    R = 5XC
 Discuss Question
Answer: Option B. -> R < XC
Question 57. What is the angular difference between +j4 and –j4?
  1.    270°
  2.    180°
  3.    30°
  4.    90°
 Discuss Question
Answer: Option B. -> 180°
Question 58. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is
  1.    92 mA
  2.    4.6 mA
  3.    460 mA
  4.    9.2 mA
 Discuss Question
Answer: Option B. -> 4.6 mA
Question 59. For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
  1.    19.52 W
  2.    25 W
  3.    275 W
  4.    195.2 W
 Discuss Question
Answer: Option D. -> 195.2 W
Question 60. A 2 k resistor is in series with a 0.015 F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?
  1.    734 and θ = –38.9°
  2.    2121 and θ = –19.5°
  3.    73.4 and θ = –19.5°
  4.    707 and θ = –19.5°
 Discuss Question
Answer: Option B. -> 2121 and θ = –19.5°

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