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MCQs

Total Questions : 61 | Page 2 of 7 pages
Question 11. A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is
  1.    152.6 Ω
  2.    1,526 Ω
  3.    1,200 Ω
  4.    942 Ω
 Discuss Question
Answer: Option B. -> 1,526 Ω
Question 12. When the frequency of the voltage applied to a series RL circuit is decreased, the impedance
  1.    Decreases
  2.    Increases
  3.    Does not change
  4.    Cannot be determined without values
 Discuss Question
Answer: Option A. -> Decreases
Question 13. A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is
  1.    47 ∠68.6° Ω
  2.    120 ∠68.6° Ω
  3.    129 ∠31.4° Ω
  4.    129 ∠68.6° Ω
 Discuss Question
Answer: Option D. -> 129 ∠68.6° Ω
Question 14. A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 ∠0° mA. The source voltage, expressed in polar form, is
  1.    3.84 ∠20.6° V
  2.    12.8 ∠20.6° V
  3.    0.3 ∠20.6° V
  4.    13.84 ∠69.4° V
 Discuss Question
Answer: Option A. -> 3.84 ∠20.6° V
Question 15. If a load is purely inductive and the reactive power is 12 VAR, the apparent power is
  1.    0 VA
  2.    12 VA
  3.    6 VA
  4.    24 VA
 Discuss Question
Answer: Option B. -> 12 VA
Question 16. In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is
  1.    18.4 V
  2.    26.0 V
  3.    2 V
  4.    20 V
 Discuss Question
Answer: Option B. -> 26.0 V
Question 17. 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.    8.74 mA
  2.    874 mA
  3.    874 µA
  4.    8.74 µA
 Discuss Question
Answer: Option A. -> 8.74 mA
Question 18. A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is
  1.    152 mA
  2.    32 mA
  3.    12 mA
  4.    120 mA
 Discuss Question
Answer: Option D. -> 120 mA
Question 19. In an RL circuit, part of the power is resistive and part is reactive.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 20. The power factor indicates how much of the apparent power is reactive power.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False

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