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MCQs

Total Questions : 90 | Page 3 of 9 pages
Question 21. A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z?
  1.    129 Ω
  2.    12.9 Ω
  3.    167 Ω
  4.    73 Ω
 Discuss Question
Answer: Option A. -> 129 Ω
Question 22. In the complex plane, the number 4 + j3 is located in the
  1.    First quadrant
  2.    Second quadrant
  3.    Third quadrant
  4.    Fourth quadrant
 Discuss Question
Answer: Option A. -> First quadrant
Question 23. The polar form of a complex number consists of a real part and a j part.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 24. In the complex plane, the number 14 - j5 is located in the
  1.    First quadrant
  2.    Second quadrant
  3.    Third quadrant
  4.    Fourth quadrant
 Discuss Question
Answer: Option D. -> Fourth quadrant
Question 25. Complex numbers can be added and subtracted but not multiplied or divided.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 26. In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is
  1.    3 V
  2.    27 V
  3.    19.2 V
  4.    1.9 V
 Discuss Question
Answer: Option C. -> 19.2 V
Question 27. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
  1.    R = XC
  2.    R > XC
  3.    R < XC
  4.    R = 5XC
 Discuss Question
Answer: Option C. -> R < XC
Question 28. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is
  1.    9.2 mA
  2.    92 mA
  3.    4.6 mA
  4.    460 mA
 Discuss Question
Answer: Option C. -> 4.6 mA
Question 29. The power factor (PF) indicates how much of the apparent power is true power.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 30. A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is
  1.    Z = 47 Ω + j150 Ω
  2.    Z = 47 Ω - j150 Ω
  3.    Z = 197 Ω
  4.    Z = 103 Ω
 Discuss Question
Answer: Option B. -> Z = 47 Ω - j150 Ω

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