Mutual Induction MCQs | Electricalvoice

Mutual Induction MCQs

Q. The mutual inductance between two coupled coils is 10 mH. If the turns in one coil are doubled and that in the other are halved, then the mutual inductance will be

  1. 5 mH
  2. 10 mH
  3. 14 mH
  4. 20 mH

Answer
(b)

Q. Given two coupled inductors L1 and L2, their mutual inductance M satisfies

Answer
(d)

Q. When two coils having self-inductances of L1 and L2 are coupled through a mutual inductance M, the coefficient of coupling, K is given by

Answer
(b)

Q. The overall inductance of two coils connected in series, with mutual inductance aiding self-inductance is L1; with mutual inductance opposing self-inductance the overall inductance is L2. The mutual inductance M is given by

Answer
(c)

Q. Two coupled coils connected in series have an equivalent inductance of 16 mH or 8 mH depending on the interconnection. Then the mutual inductance M between the coils is

  1. 12 mH
  2. 8 mH
  3. 4 mH
  4. 2 mH

Answer
(d)

Q. Two coils having self-inductance of 10 mH and 15 mH and effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect them in series opposing?

  1. 20 mH
  2. 10 mH
  3. 5 mH
  4. zero

Answer
(b)

Q. The coupling between two magnetically coupled coils is said to be ideal if the coefficient of coupling is

  1. zero
  2. 0.1
  3. 1
  4. 2

Answer
(c)

Q. Two inductive coils with self inductance L1 and L2 are magnetically coupled in series opposing and in parallel aiding respectively. The mutual inductance between the coils in the two cases are respectively

Answer
(c)

Q. Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of K = 0.8. The turn ratio (N1/N2) is

  1. 4
  2. 2
  3. 1
  4. 0.5

Answer
(c)

Q. In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be

  1. 2.0
  2. 1.0
  3. 0.5
  4. zero

Answer
(b)

Q. Two coils are coupled in such a way that the mutual inductance between them is 16 mH, if the inductances of the coils are 20 mH and 80 mH respectively, the coefficient of coupling is

  1. 0.01
  2. 0.4
  3. 0.1
  4. 0.0025

Answer
(b)

Q. Two identical coils of negligible resistance, when connected in series across a 50 Hz fixed voltage source, draw a current of 10 A. When the terminals of one of the coils are reversed, the current drawn is 8 A. The coefficient of coupling between the two coils is

  1. 1/100
  2. 1/9
  3. 4/10
  4. 8/10

Answer
(b)
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