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MCQs

Total Questions : 61 | Page 1 of 7 pages
Question 1. If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
  1.    Doubles
  2.    Halves
  3.    Remains constant
  4.    Cannot be determined without values
 Discuss Question
Answer: Option D. -> Cannot be determined without values
Question 2. When the frequency of the voltage applied to a series RL circuit is decreased, the impedance decreases
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 3. A filter passes certain frequencies and rejects others.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 4. In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 5. When the frequency is decreased, the impedance of a parallel RL circuit
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    Is not a factor
 Discuss Question
Answer: Option B. -> Decreases
Question 6. A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is
  1.    564
  2.    0.564
  3.    6.76
  4.    55.7
 Discuss Question
Answer: Option B. -> 0.564
Question 7. Total current in an RL circuit always lags the source voltage.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 8. When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle
  1.    Increases
  2.    Decreases
  3.    Is not affected
  4.    Cannot be determined
 Discuss Question
Answer: Option A. -> Increases
Question 9. The phase angle (?) of a series RL circuit varies directly with frequency.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 10. A 140 Ω resistor is in parallel with an inductor having 60 Ω inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is
  1.    5.51 Ω
  2.    55.15 Ω
  3.    90 Ω
  4.    200 Ω
 Discuss Question
Answer: Option B. -> 55.15 Ω

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