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MCQs

Total Questions : 65 | Page 6 of 7 pages
Question 51. . What is the band pass (F1 – F2) of an RLC filter that resonates at 150 kHz and has a coil Q of 30?
  1.    100.0 kHz to 155.0 kHz
  2.    147.5 kHz to 152.5 kHz
  3.    295.5 kHz to 4500 kHz
  4.    149,970 Hz to 150,030 Hz
 Discuss Question
Answer: Option B. -> 147.5 kHz to 152.5 kHz
Question 52. . What is the approximate phase angle in a series RLC circuit when VC = 117 V, VR = 14.5 V, and VL = 3.3 V?
  1.    –45.0 degrees
  2.    –82.7 degrees
  3.    –90.0 degrees
  4.    –172.7 degrees
 Discuss Question
Answer: Option B. -> –82.7 degrees
Question 53. . What would be the power factor for an RLC circuit that acts inductively?
  1.    +90 degrees leading
  2.    one
  3.    zero
  4.    –90 degrees lagging
 Discuss Question
Answer: Option C. -> zero
Question 54. . Which statement best describes reactance in a series RLC circuit?
  1.    Capacitive reactance is always dominant.
  2.    Inductive reactance is always dominant.
  3.    Resistance is always dominant.
  4.    The larger of the two reactances is dominant.
 Discuss Question
Answer: Option D. -> The larger of the two reactances is dominant.
Question 55. . Voltage lags current in an RLC circuit when it acts:
  1.    capacitively
  2.    resistively
  3.    inductively
  4.    resonantly
 Discuss Question
Answer: Option A. -> capacitively
Question 56. . The ___ of a circuit describes the ability of that circuit to respond to certain frequencies while rejecting all others.
  1.    bandwidth
  2.    selectivity
  3.    sensitivity
  4.    quality factor
 Discuss Question
Answer: Option B. -> selectivity
Question 57. . The ______ of a circuit describes the ability of that circuit to respond to certain frequencies while rejecting all others.
  1.    bandwidth
  2.    selectivity
  3.    sensitivity
  4.    quality factor
 Discuss Question
Answer: Option B. -> selectivity
Question 58. . At frequencies well above and below the resonant frequency, the series RLC circuit looks ______ and the parallel RLC circuit looks ______.
  1.    like a short, like an open
  2.    like an open, like a short
  3.    inductive, capacitive
  4.    capacitive, inductive
 Discuss Question
Answer: Option D. -> capacitive, inductive
Question 59. . Series resonance happens when _____.
  1.    XC = XC
  2.    XL = XC
  3.    XL = XB
  4.    XT = R
 Discuss Question
Answer: Option B. -> XL = XC
Question 60. . When a parallel tank circuit is used in series with an output load resistor the filter is ______.
  1.    low-pass
  2.    band-stop
  3.    band-pass
  4.    high-pass
 Discuss Question
Answer: Option B. -> band-stop

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