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Home⇒ Engineering⇒
Electromagnetic induction
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The self inductances of two coils are 8
mH and 18 mH If the co-efficients of
coupling is 0.5, the mutual inductance
of the coils is 6 mH [other wrong options] [Discuss in forum] 4 mH 5 mH 12 mH |
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? 0.5 s [other wrong options] [Discuss in forum] 0.01 s 0.1 s 5 s |
Q23 ⇒ A coil is wound on iron core which carries
current I. The self induced voltage
in the coil is not affected by variation in voltage to the coil [other wrong options] [Discuss in forum] variation in coil current change of number of turns of coil the resistance of magnetic path |
Q24 ⇒ An open coil has infinite resistance and zero inductance [other wrong options] [Discuss in forum] zero resistance and inductance infinite resistance and normal inductance zero resistance and high inductance |
Q25 ⇒ The law that the induced e.m.f. and
current always oppose the cause
producing them is due to Lenz [other wrong options] [Discuss in forum] Faraday Newton Coulomb |
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 38 mH [other wrong options] [Discuss in forum] 32 mH 40 mH 48 mH |
Q27 ⇒ Which of the following inductor will
have the least eddy current losses? Air core [other wrong options] [Discuss in forum] Laminated iron core Iron core Powdered iron core |
Q28 ⇒ Which of the following statements is
cotrect ? The inductance of the coil carrying a constant D.C. current will not affect the current [other wrong options] [Discuss in forum] The inductance of the coil carrying
a constant D.C. current will change
the current into pulses The inductance of the coil carrying a constant D.C. current will increase the current The inductance of the coil carrying a constant D.C. current will decrease the current |
Q29 ⇒ Both the number of turns and the core
length of an inductive coil are doubled.
Its self-inductance will be doubled [other wrong options] [Discuss in forum] unaffected halved quadrupled |
Q30 ⇒ Which of the following is not a unit of
inductance? Coulomb/volt ampere [other wrong options] [Discuss in forum] Henry Volt second per ampere All of the above |
Q31 ⇒ A 200 turn coil has an inductance of 12
mH. If the number of turns is increased
to 400 turns, all other quantities (area,
length etc.) remaining the same, the
inductance will be 48 mH [other wrong options] [Discuss in forum] 6 mH 14 mH 24 mH |
Q32 ⇒ A conductor 2 metres long moves at
right angles to a magnetic field of flux
densit 1 tesla with a velocity of 12.5
m/s. The induced e.m.f. in the conductor
will be 25 V [other wrong options] [Discuss in forum] 10 V 15 V 50 V |
Q33 ⇒ A coil induces 350 mV when the current
changes at the rate of 1 A/s. The value
of inductance is 350 mH [other wrong options] [Discuss in forum] 3500 mH 250 mH 150 mH |
Q34 ⇒ As per Faraday's laws of electromagnetic
induction, an e.m.f. is induced in
a conductor whenever it cuts magnetic flux [other wrong options] [Discuss in forum] lies perpendicular to the magnetic
flux lies in a magnetic field moves parallel to the direction of the magnetic field |
Q35 ⇒ Ifcurrentin a conductor increases then
according to Lenz's law self-induced
voltage will produce current opposite to the increasing current [other wrong options] [Discuss in forum] aid the increasing current tend to decrease the amount of current aid tite applied voltage |
Q36 ⇒ In case of an inductance, current is
proportional to magnetic field [other wrong options] [Discuss in forum] voltage across the inductance both (a) and (b) neither (a) nor (b) |
Q37 ⇒ Two coils have self-inductances of 10 H
and 2 H, the mutual inductance being
zero. If the two coils are connected in
series, the total inductance will be 12 H [other wrong options] [Discuss in forum] 6 H 8 H 24 H |
Q38 ⇒ Lenz's law is a consecluence of the law
of conservation of enery [other wrong options] [Discuss in forum] induced current charge induced e.m.f. |
Q39 ⇒ The property of coil by which a counter
e.m.f. is induced in it when the current
through the coil chatiges is known as self-inductance [other wrong options] [Discuss in forum] mutual inductance series aiding inductace capacitance |
Q40 ⇒ The direction of induced e.m.f. can be
found by Lenz's law [other wrong options] [Discuss in forum] Laplace's law Fleming's right hand rule Kirchhoffs voltage law |
Or |