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MCQs

Total Questions : 149 | Page 5 of 15 pages
Question 41. Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
  1.    660 kΩ
  2.    219 kΩ
  3.    1.3 MΩ
  4.    66 kΩ
 Discuss Question
Answer: Option A. -> 660 kΩ
Question 42. An inductor, a 1 k resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is
  1.    4 V
  2.    0 V
  3.    12 V
  4.    6 V
 Discuss Question
Answer: Option D. -> 6 V
Question 43. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
  1.    partly shorted
  2.    open
  3.    good
  4.    shorted
 Discuss Question
Answer: Option D. -> shorted
Question 44. An inductance of 0.43 mH is smaller than
  1.    430 μH
  2.    0.00043 H
  3.    0.05 H
  4.    43 μH
 Discuss Question
Answer: Option C. -> 0.05 H
Question 45. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
  1.    1.8 mV
  2.    180 mV
  3.    1.25 mV
  4.    18 mV
 Discuss Question
Answer: Option D. -> 18 mV
Question 46. The winding resistance of a coil can be increased by
  1.    increasing the number of turns
  2.    increasing the number of turns or using thinner wire
  3.    using a thinner wire
  4.    changing the core material
 Discuss Question
Answer: Option B. -> increasing the number of turns or using thinner wire
Question 47. An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then
  1.    VL = VR
  2.    VL > VR
  3.    VL < VR
  4.    VR ≥ VL
 Discuss Question
Answer: Option B. -> VL > VR
Question 48. When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
  1.    remains the same
  2.    increases
  3.    decreases
  4.    doubles
 Discuss Question
Answer: Option C. -> decreases
Question 49. A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
  1.    400 mA
  2.    91 mA
  3.    78 mA
  4.    57 mA
 Discuss Question
Answer: Option C. -> 78 mA
Question 50. A 320 H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value?
  1.    48 s
  2.    0.48 μs
  3.    0.48 ms
  4.    0.48 s
 Discuss Question
Answer: Option D. -> 0.48 s

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