ONLINE MCQ EE-ELECTROMAGNETIC INDUCTION 2

Q11. Mutually inductance between two
magnetically-coupled coils depends on
 A.  permeability of the core
 [Wrong Answer]
 B.  the number of their turns
 [Wrong Answer]
 C.  cross-sectional area of their common
core
 [Wrong Answer]
 D.  all of the above
 [Correct Answer]
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Q12. An e.m.f. of 16 volts is induced in a coil
of inductance 4 H. The rate of change of
current must be
 A.  64 A/s
 [Wrong Answer]
 B.  32 A/s
 [Wrong Answer]
 C.  16 A/s
 [Wrong Answer]
 D.  4 A/s
 [Correct Answer]
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Q13. The co-efficient of coupling between
two air core coils depends on
 A.  self-inductance of two coils only
 [Wrong Answer]
 B.  mutual inductance between two
coils only
 [Wrong Answer]
 C.  mutual inductance and self inductance
of two coils
 [Correct Answer]
 D.  none of the above
 [Wrong Answer]
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Q14. A crack in the magnetic path of an
inductor will result in
 A.  unchanged inductance
 [Wrong Answer]
 B.  increased inductance
 [Wrong Answer]
 C.  zero inductance
 [Wrong Answer]
 D.  reduced inductance
 [Correct Answer]
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Q15. Higher the self-inductance of a coil,
 A.  lesser its weher-turns
 [Wrong Answer]
 B.  lower the e.m.f. induced
 [Wrong Answer]
 C.  greater the flux produced by it
 [Wrong Answer]
 D.  longer the delay in establishing
steady current through it
 [Correct Answer]
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Q16. A laminated iron core has reduced
eddy-current losses because
 A.  more wire can he used with less
D.C. resistance in coil
 [Wrong Answer]
 B.  the laminations are insulated from
each other
 [Correct Answer]
 C.  the magnetic flux is concentrated in
the air gap of the core
 [Wrong Answer]
 D.  the laminations are stacked vertically
 [Wrong Answer]
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Q17. The core of a coil has a length of 200
mm. The inductance of coil is 6 mH. If
the core length is doubled, all other
quantities, remaining the same, the inductance
will be
 A.  3 mH
 [Correct Answer]
 B.  12 mH
 [Wrong Answer]
 C.  24 mH
 [Wrong Answer]
 D.  48 mH
 [Wrong Answer]
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Q18. An average Voltage of 10 V is induced
in a 250 turns solenoid as a result of a
change in flux which occurs in 0.5
second. The total flux change is
 A.  20 Wb
 [Wrong Answer]
 B.  2 Wb
 [Wrong Answer]
 C.  0.2 Wb
 [Wrong Answer]
 D.  0.02 Wb
 [Correct Answer]
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Q19. In an iron cored coil the iron core is
removed so that the coil becomes an air
cored coil. The inductance of the coil
will
 A.  increase
 [Wrong Answer]
 B.  decrease
 [Correct Answer]
 C.  remain the same
 [Wrong Answer]
 D.  initially increase and then decrease
 [Wrong Answer]
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Q20. The co-efficient of self-inductance for a
coil is given as
 A.  NI/Φ
 [Wrong Answer]
 B.  NΦ/I
 [Correct Answer]
 C.  NI2/Φ
 [Wrong Answer]
 D.  NΦ/I2
 [Wrong Answer]
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ONLINE MCQ EE-ELECTROMAGNETIC INDUCTION 3
QUIZ OF DAY-04/02/2017 GK&CURRENT AFFAIRS

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