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MCQs

Total Questions : 149 | Page 4 of 15 pages
Question 31. An induced voltage is produced as a result of a dc voltage.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 32. Inductance is the property of an inductor that produces an opposition to any change in current.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 33. 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.    VR = VL
  2.    VL < VR
  3.    VL = VR
  4.    VL > VR
 Discuss Question
Answer: Option D. -> VL > VR
Question 34. An inductance of 0.08 μH is larger than
  1.    0.0000008 H
  2.    0.00008 mH
  3.    0.000008 H
  4.    0.000000008 H
 Discuss Question
Answer: Option D. -> 0.000000008 H
Question 35. The voltage across a coil when di/dt = 20 mA/s and L = 8 H is
  1.    1.6 mV
  2.    2.5 mV
  3.    160 mV
  4.    16 mV
 Discuss Question
Answer: Option C. -> 160 mV
Question 36. A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is
  1.    55 mH
  2.    less than 0.2 mH
  3.    5.5 mH
  4.    less than 5.5 mH
 Discuss Question
Answer: Option C. -> 5.5 mH
Question 37. A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is
  1.    9.9 mH
  2.    less than 0.6 mH
  3.    9.9 mH or greater than 5 mH
  4.    greater than 5 mH
 Discuss Question
Answer: Option B. -> less than 0.6 mH
Question 38. A 240 H inductor is equivalent to a
  1.    240 H inductor
  2.    0.000240 mH inductor
  3.    240 mH inductor
  4.    0.240 mH inductor
 Discuss Question
Answer: Option D. -> 0.240 mH inductor
Question 39. A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
  1.    momentarily goes to zero
  2.    is decreased
  3.    does not change
  4.    is increased
 Discuss Question
Answer: Option D. -> is increased
Question 40. Two inductors, L1 and L2, are in parallel. L1 has a value of 25 H and L2 a value of 50 H. The parallel combination is in series with L3, a 20 H coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is
  1.    87 mA
  2.    337 mA
  3.    87 A
  4.    870 mA
 Discuss Question
Answer: Option D. -> 870 mA

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