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MCQs

Total Questions : 65 | Page 4 of 7 pages
Question 31.  What is the Q (Quality factor) of a series circuit that resonates at 6 kHz, has equal reactance of 4 kilo-ohms each, and a resistor value of 50 ohms?
  1.    0.001
  2.    50
  3.    80
  4.    4.0
 Discuss Question
Answer: Option C. -> 80
Question 32.  What is the range between f1 and f2 of an RLC circuit that resonates at 150 kHz and has a Q of 30?
  1.    100.0 kHz to 155.0 kHz
  2.    147.5 kHz to 152.5 kHz
  3.    4500 kHz to 295.5 kHz
  4.    149,970 Hz to 150,030 Hz
 Discuss Question
Answer: Option B. -> 147.5 kHz to 152.5 kHz
Question 33.  What effect will a parallel tank have upon final filter current?
  1.    very little
  2.    The bandpass frequencies will change.
  3.    The frequency cutoff will change.
  4.    The impedance will block output.
 Discuss Question
Answer: Option A. -> very little
Question 34.  When a parallel circuit resonates it is said to:
  1.    flywheel
  2.    oscillate
  3.    both of the above
  4.    none of the above
 Discuss Question
Answer: Option C. -> both of the above
Question 35.  When XC = XL the circuit:
  1.    draws maximum current
  2.    applied voltage is zero
  3.    is at resonance
  4.    draws minimum current
 Discuss Question
Answer: Option C. -> is at resonance
Question 36.   Series RLC voltage or impedance totals must be calculated by:
  1.    subtracting the values
  2.    graphing the angles
  3.    adding vectors
  4.    multiplying the values
 Discuss Question
Answer: Option C. -> adding vectors
Question 37. . What is the current phase angle for a parallel RLC circuit when IL = 15.3 A, IC = 0.43 A, and IR = 3.5 A?
  1.    76.7 degrees
  2.    –4.25 degrees
  3.    88.8 degrees
  4.    –76.7 degrees
 Discuss Question
Answer: Option D. -> –76.7 degrees
Question 38. . When a full band of frequencies is allowed to pass through a filter circuit to the output, the resonant circuit is called a:
  1.    low-pass filter
  2.    high-pass filter
  3.    band-stop filter
  4.    bandpass filter
 Discuss Question
Answer: Option D. -> bandpass filter
Question 39. . At resonance, the term bandwidth includes all frequencies that allow what percentage of maximum current to flow?
  1.    50
  2.    62.3
  3.    70.7
  4.    95.3
 Discuss Question
Answer: Option C. -> 70.7
Question 40. . What is the true power consumed in a 30 V series RLC circuit if Z = 20 ohms and R = 10 ohms?
  1.    15.0 watts
  2.    22.5 watts
  3.    30.0 watts
  4.    45.0 watts
 Discuss Question
Answer: Option B. -> 22.5 watts

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