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MCQs

Total Questions : 61 | Page 5 of 7 pages
Question 41. In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is
  1.    4.24 A
  2.    42.4 A
  3.    424 mA
  4.    6 A
 Discuss Question
Answer: Option A. -> 4.24 A
Question 42. When the frequency of the voltage applied to a series RL circuit is decreased, the impedance
  1.    cannot be determined without values
  2.    decreases
  3.    does not change
  4.    increases
 Discuss Question
Answer: Option B. -> decreases
Question 43. A 47Ω resistor is in series with an inductive reactance of 120Ω across an ac source. The impedance, expressed in polar form, is
  1.    129 angle 31.4°
  2.    129 angle 68.6°
  3.    47 angle 68.6°
  4.    120 angle 68.6°
 Discuss Question
Answer: Option B. -> 129 angle 68.6°
Question 44. A 140Ω resistor is in parallel with an inductor having 60 inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is
  1.    55.15Ω
  2.    200Ω
  3.    5.51Ω
  4.    90Ω
 Discuss Question
Answer: Option A. -> 55.15Ω
Question 45. When the frequency of the voltage applied to a series RL circuit is increased, the phase angle
  1.    increases
  2.    does not change
  3.    decreases
  4.    cannot be determined without values
 Discuss Question
Answer: Option A. -> increases
Question 46. If a load is purely inductive and the reactive power is 12 VAR, the apparent power is
  1.    24 VA
  2.    0 VA
  3.    12 VA
  4.    6 VA
 Discuss Question
Answer: Option C. -> 12 VA
Question 47. A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is
  1.    874 mA
  2.    8.74 A
  3.    874 A
  4.    8.74 mA
 Discuss Question
Answer: Option D. -> 8.74 mA
Question 48. If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
  1.    doubles
  2.    cannot be determined without values
  3.    halves
  4.    remains constant
 Discuss Question
Answer: Option B. -> cannot be determined without values
Question 49. Which of the following power factors results in less energy loss in an RL circuit?
  1.    0.8
  2.    0.4
  3.    0.2
  4.    1
 Discuss Question
Answer: Option C. -> 0.2
Question 50.  As frequency increases
  1.    both series and parallel RL impedance decrease
  2.    series RL impedance decreases and parallel RL impedance increases
  3.    series RL impedance increases and parallel RL impedance decreases
  4.    both series and parallel RL impedance increase
 Discuss Question
Answer: Option D. -> both series and parallel RL impedance increase

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