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Electrical Engineering
Electromagnetic Induction
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Q.1
A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly
50 N
120 N
240 N
480 N
Q.2
A crack in the magnetic path of an inductor will result in
Unchanged inductance
Increased inductance
Zero inductance
Reduced inductance
Q.3
A laminated iron core has reduced eddy-current losses because
More wire can be used with less D.C. resistance in coil
The laminations are insulated from each other
The magnetic flux is concentrated in the air gap of the core
The laminations are stacked vertically
Q.4
In case of an inductance, current is proportional to
Voltage across the inductance
Magnetic field
Both A and B
Neither A)nor B
Q.5
Lenz's law is a consequence of the law of conservation of
Induced current
Charge
Energy
Induced e.m.f.
Q.6
The inductance of a coil will increase under all the following conditions except
When more length for the same number of turns is provided
When the number of turns of the coil increase
When more area for each turn is provided
When permeability of the core increases
Q.7
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.
Yes
No
Q.8
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
20 Wb
2 Wb
0.2 Wb
0.02 Wb
Q.9
The law that the induced e.m.f. and current always oppose the cause producing them is due to
Faraday
Lenz
Newton
Coulomb
Q.10
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 mH
5 H
10 H
Q.11
Which of the following inductor will have the least eddy current losses?
Air core
Laminated iron core
Iron core
Powdered iron core
Q.12
If current in a conductor increases then according to Lenz's law self-induced voltage will
Aid the increasing current
Tend to decrease the amount of current
Produce current opposite to the increasing current
Aid the applied voltage
Q.13
Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
32 mH
38 mH
40 mH
48 mH
Q.14
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
Lies perpendicular to the magnetic flux
Lies in a magnetic field
Cuts magnetic flux
Moves parallel to the direction of the magnetic field
Q.15
The coefficient of coupling between two air core coils depends on
Self-inductance of two coils only
Mutual inductance between two coils only
Mutual inductance and self inductance of two coils
None of the above
Q.16
Air-core coils are practically free from
Hysteresis losses
Eddy current losses
Both A and B
None of the above
Q.17
The magnitude of the induced e.m.f. in a conductor depends on the
Flux density of the magnetic field
Amount of flux cut
Amount of flux linkages
Rate of change of flux-linkages
Q.18
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
3500 mH
350 mH
250 mH
150 mH
Q.19
The direction of induced e.m.f. can be found by
Laplace's law
Lenz's law
Fleming's right hand rule
Kirchhoff s voltage law
Q.20
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
Increase
Decrease
Remain the same
Initially increase and then decrease
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