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MCQs

Total Questions : 61 | Page 4 of 7 pages
Question 31. 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.    55.7
  2.    564
  3.    6.76
  4.    0.564
 Discuss Question
Answer: Option D. -> 0.564
Question 32. The voltages in Problem 5 are measured at a certain frequency. To make the resistor voltage less than the inductor voltage, the frequency is
  1.    increased
  2.    doubled
  3.    not a factor
  4.    decreased
 Discuss Question
Answer: Option A. -> increased
Question 33. 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.    2 V
  2.    20 V
  3.    26.0 V
  4.    18.4 V
 Discuss Question
Answer: Option C. -> 26.0 V
Question 34. To increase the current in a series RL circuit, the frequency
  1.    cannot be determined without values
  2.    should be decreased
  3.    should be constant
  4.    should be increased
 Discuss Question
Answer: Option B. -> should be decreased
Question 35. 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.    1526Ω
  2.    942Ω
  3.    152.6Ω
  4.    1200Ω
 Discuss Question
Answer: Option A. -> 1526Ω
Question 36. When the frequency is decreased, the impedance of a parallel RL circuit
  1.    decreases
  2.    increases
  3.    remains constant
  4.    is not a factor
 Discuss Question
Answer: Option A. -> decreases
Question 37. 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 angle 0° mA. The source voltage, expressed in polar form, is
  1.    3.84 angle 20.6° V
  2.    0.3 angle 20.6° V
  3.    13.84 angle 69.4° V
  4.    12.8 angle 20.6° V
 Discuss Question
Answer: Option A. -> 3.84 angle 20.6° V
Question 38. A 470Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is
  1.    12.60 angle –76° mS
  2.    12.18 angle –76° mS
  3.    218 angle –76° mS
  4.    12.18 angle 76° mS
 Discuss Question
Answer: Option B. -> 12.18 angle –76° mS
Question 39. Referring to Problem 23, the reactive power is
  1.    100 mVAR
  2.    148 mVAR
  3.    10 mVAR
  4.    6.76 mVAR
 Discuss Question
Answer: Option A. -> 100 mVAR
Question 40. 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

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