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MCQs

Total Questions : 65 | Page 3 of 7 pages
Question 21. A 10 Ω resistor, a 90 mH coil, and a 0.015 µF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is
  1.    1,616 Ω
  2.    161 Ω
  3.    3,387 Ω
  4.    1,771 Ω
 Discuss Question
Answer: Option A. -> 1,616 Ω
Question 22. At series resonance, the inductive reactance and capacitive reactance are never equal.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 23. A 90 Ω resistor, a coil with 30 Ω of reactance, and a capacitor with 50 Ω of reactance are in series across a 12 V ac source. The current through the resistor is
  1.    9 mA
  2.    90 mA
  3.    13 mA
  4.    130 mA
 Discuss Question
Answer: Option D. -> 130 mA
Question 24. The quality factor (Q) is the ratio of true power to apparent power.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 25. A 24 Ω resistor, an inductor with a reactance of 120 Ω, and a capacitor with a reactance of 120 Ω are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is
  1.    60 V
  2.    660 V
  3.    30 V
  4.    300 V
 Discuss Question
Answer: Option D. -> 300 V
Question 26. A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is
  1.    7 kHz
  2.    13 kHz
  3.    20 kHz
  4.    4 kHz
 Discuss Question
Answer: Option D. -> 4 kHz
Question 27. XL and XC have opposing effects in an RLC circuit.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 28.  What is the applied voltage for a series RLC circuit when IT = 3 mA, VL = 30 V, VC = 18 V, and R = 1000 ohms?
  1.    3.00 V
  2.    12.37 V
  3.    34.98 V
  4.    48.00 V
 Discuss Question
Answer: Option B. -> 12.37 V
Question 29.  In a parallel RLC circuit, which value may always be used as a vector reference?
  1.    current
  2.    reactance
  3.    resistance
  4.    voltage
 Discuss Question
Answer: Option D. -> voltage
Question 30.  How much current will flow in a 100 Hz series RLC circuit if VS = 20 V, RT = 66 ohms, and XT = 47 ohms?
  1.    1.05 A
  2.    303 mA
  3.    247 mA
  4.    107 mA
 Discuss Question
Answer: Option C. -> 247 mA

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