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Electromagnetic Induction
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Two 300 uH coils in series without mutual coupling have a total inductance of
300 uH
75 uH
600 uH
150 uH
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
50 ohms
500 ohms
5000 ohms
1000 ohms
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
3500 mH
150 mH
350 mH
250 mH
Current changing from 8 A to 12 A in one second induced 20 volts in a coil The value of inductance is
5 mH
10 H
5 H
10 mH
A coil is wound on iron core which carries current
I. The self-induced voltage in the coil is not affected by
the resistance of magnetic path
variation in coil current
variation in voltage to the coil
change of number of turns of coil
A crack in the magnetic path of an inductor will result in
zero inductance
unchanged inductance
reduced inductance
increased inductance
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
0.01 s
5 s
0.1 s
0.5 s
Which of the fpllowing inductor will have the least eddy current losses
Laminated iron core
Iron core
Powdered iron core
Air core
A conductor carries 125 amperes of current under 60� to a magnetic field of 1.1tesla.
The force on the conductor will be nearly
480 N
240 N
120 N
50 N
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5second.
The total flux change is
0.02 Wb
20 Wb
2 Wb
0.2 Wb
The co-efficient of coupling between two air core coils depends on
mutual inductance and self inductance of two coils
None of the above
mutual inductance between two coils only
self-inductance of two coils only
Lenz's law is a consequence of the law of conservation of
Energy
induced e.m.f.
induced current
charge
A conductor 2 metres long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced
e.m.f. in the conductor will be
10 V
50V
15 V
25V
Which circuit element(s) will oppose the change in circuit current
Inductance and capacitance
Resistance only
Capacitance only
Inductance only
Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
400 N
600 N
1000 N
100 N
Which of the following circuit elements will oppose the change in circuit current
All of the above
Capacitance
Inductance
resistance
Two coils have self-inductances of 10 H and 2 H, the mutual inductance beingzero.
If the two coils are connected in series, the total inductance will be
12 H
8 H
6 H
24 H
An open coil has
zero resistance and high inductance
zero resistance and inductance
infinite resistance and normal inductance
infinite resistance and zero inductance
Higher the self-inductance of a coil,
lesser its weber-turns
greater the flux produced by it
lower the e.m.f. induced
longer the delay in establishing steady current through it
An
e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
4 A/s
32 A/s
16 A/s
64 A/s
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