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ONLINE MCQ EE-ELECTROMAGNETIC INDUCTION 3

Harikesh Yadav
Q21. The self inductance’s of two coils are 8
mH and 18 mH If the co-efficient s of
coupling is 0.5, the mutual inductance
of the coils is
 A.  4 mH
 [Wrong Answer]		  B.  5 mH
 [Wrong Answer]
 C.  6 mH
 [Correct Answer]		  D.  12 mH
 [Wrong Answer]
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Q22. A 500 turns solenoid develops an
average induced voltage of 60 V. Over
what time interval must a flux change
of 0.06 Wb occur to produce such a
voltage?
 A.  0.01 s
 [Wrong Answer]		  B.  0.1 s
 [Wrong Answer]
 C.  0.5 s
 [Correct Answer]		  D.  5 s
 [Wrong Answer]
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Q23. A coil is wound on iron core which carries
current I. The self induced voltage
in the coil is not affected by
 A.  variation in coil current
 [Wrong Answer]		  B.  variation in voltage to the coil
 [Correct Answer]
 C.  change of number of turns of coil
 [Wrong Answer]		  D.  the resistance of magnetic path
 [Wrong Answer]
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Q24. An open coil has
 A.  zero resistance and inductance
 [Wrong Answer]		  B.  infinite resistance and zero inductance
 [Correct Answer]
 C.  infinite resistance and normal inductance
 [Wrong Answer]		  D.  zero resistance and high inductance
 [Wrong Answer]
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Q25. The law that the induced e.m.f. and
current always oppose the cause
producing them is due to
 A.  Faraday
 [Wrong Answer]		  B.  Lenz
 [Correct Answer]
 C.  Newton
 [Wrong Answer]		  D.  Coulomb
 [Wrong Answer]
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Q26. Two coils have inductances of 8 mH and
18 mH and a co-efficient of coupling of
0.5. If the two coils are connected in
series aiding, the total inductance will
be
 A.  32 mH
 [Wrong Answer]		  B.  27 mH
 [Correct Answer]
 C.  40 mH
 [Wrong Answer]		  D.  48 mH
 [Wrong Answer]
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Q27. Which of the following inductor will
have the least eddy current losses?
 A.  Air core
 [Correct Answer]		  B.  Laminated iron core
 [Wrong Answer]
 C.  Iron core
 [Wrong Answer]		  D.  Powdered iron core
 [Wrong Answer]
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Q28. Which of the following statements is correct ?
 A.  The inductance of the coil carrying
a constant D.C. current will change
the current into pulses
 [Wrong Answer]		  B.  The inductance of the coil carrying
a constant D.C. current will increase
the current
 [Wrong Answer]
 C.  The inductance of the coil carrying
a constant D.C. current will not affect
the current
 [Correct Answer]		  D.  The inductance of the coil carrying
a constant D.C. current will
decrease the current
 [Wrong Answer]
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Q29. Both the number of turns and the core
length of an inductive coil are doubled.
Its self-inductance will be
 A.  unaffected
 [Wrong Answer]		  B.  doubled
 [Correct Answer]
 C.  halved
 [Wrong Answer]		  D.  quadrupled
 [Wrong Answer]
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Q30. Which of the following is not a unit of
inductance?
 A.  Henry
 [Wrong Answer]		  B.  Coulomb/volt ampere
 [Correct Answer]
 C.  Volt second per ampere
 [Wrong Answer]		  D.  All of the above
 [Wrong Answer]
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