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Total Questions : 90 | Page 7 of 9 pages
Question 61. In a series RC circuit, when the frequency and the resistance are halved, the impedance
  1.    doubles
  2.    is halved
  3.    is reduced to one-fourth
  4.    cannot be determined without values
 Discuss Question
Answer: Option D. -> cannot be determined without values
Question 62. When the frequency of the voltage applied to a series RC circuit is increased, the phase angle
  1.    becomes erratic
  2.    increases
  3.    decreases
  4.    remains the same
 Discuss Question
Answer: Option C. -> decreases
Question 63. A 12 kΩ resistor is in series with a 0.02 μF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 angle 0° mA, what is the source voltage expressed in polar form?
  1.    0.411 V
  2.    411.3 V
  3.    45.6 V
  4.    4.11 V
 Discuss Question
Answer: Option D. -> 4.11 V
Question 64. The complex number 40 angle 55° is equivalent to
  1.    45.88 + j65.52
  2.    22.94 + j32.76
  3.    55 + j55
  4.    40 + j40
 Discuss Question
Answer: Option B. -> 22.94 + j32.76
Question 65. A 120Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance?
  1.    4800Ω
  2.    37.9Ω
  3.    3.7Ω
  4.    14400Ω
 Discuss Question
Answer: Option B. -> 37.9Ω
Question 66. A 2 kΩ resistor and a 0.002 μF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is
  1.    845 mW
  2.    130 mW
  3.    13 mW
  4.    84.5 mW
 Discuss Question
Answer: Option D. -> 84.5 mW
Question 67. A 47Ω resistor and a capacitor with 150Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is
  1.    Z = 47Ω + j150Ω
  2.    Z = 103Ω
  3.    Z = 47Ω – j150Ω
  4.    Z = 197Ω
 Discuss Question
Answer: Option C. -> Z = 47Ω – j150Ω
Question 68. A capacitor with 150Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
  1.    Z = 150 angle – 90° Ω
  2.    Z = 150 –90° Ω
  3.    Z = 150
  4.    Z = 150 angle 180° Ω
 Discuss Question
Answer: Option B. -> Z = 150 –90° Ω
Question 69. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance
  1.    increases
  2.    decreases
  3.    doubles
  4.    remains the same
 Discuss Question
Answer: Option A. -> increases
Question 70.  Power that is measured in volt-amperes is called
  1.    impedance power
  2.    reactive power
  3.    true power
  4.    apparent power
 Discuss Question
Answer: Option D. -> apparent power

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