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MCQs

Total Questions : 149 | Page 6 of 15 pages
Question 51. Three 15 mH inductors are in series. The total inductance is
  1.    5 mH
  2.    15 mH
  3.    45 mH
  4.    30 mH
 Discuss Question
Answer: Option C. -> 45 mH
Question 52. An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is
  1.    1 A
  2.    10 mA
  3.    100 mA
  4.    1 mA
 Discuss Question
Answer: Option C. -> 100 mA
Question 53. Five inductors are connected in series. The lowest value is 8 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is
  1.    8 H
  2.    32 μH
  3.    64 μH
  4.    248 μH
 Discuss Question
Answer: Option D. -> 248 μH
Question 54. The inductance of an iron-core coil decreases if
  1.    the number of turns is decreased
  2.    the length of the coil decreases
  3.    the iron core is removed
  4.    None of these
 Discuss Question
Answer: Option A. -> the number of turns is decreased
Question 55. The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximately
  1.    14 μH
  2.    6.9 μH
  3.    155 μH
  4.    2.2 μH
 Discuss Question
Answer: Option B. -> 6.9 μH
Question 56. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field
  1.    doubles
  2.    quadruples
  3.    is quartered
  4.    does not change
 Discuss Question
Answer: Option C. -> is quartered
Question 57.  
The electrical energy consumed by a coil is stored in the form of:
  1.    an electrical field
  2.    a force field
  3.    an electrostatic field
  4.    a magnetic field
 Discuss Question
Answer: Option D. -> a magnetic field
Question 58.  Electricity may be generated by a wire:
  1.    carrying current
  2.    wrapped as a coil
  3.    that has neutral domains
  4.    passing through a flux field
 Discuss Question
Answer: Option D. -> passing through a flux field
Question 59.  In a purely inductive circuit,
  1.    current leads voltage by 90°
  2.    voltage lags current by 90°
  3.    voltage leads current by 90°
  4.    voltage and current are in phase (0°)
 Discuss Question
Answer: Option C. -> voltage leads current by 90°
Question 60.  What is hysteresis?
  1.    lead between cause and effect
  2.    lag between cause and effect
  3.    lead between voltage and current
  4.    lag between voltage and current
 Discuss Question
Answer: Option B. -> lag between cause and effect

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