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Electrical Engineering
Electromagnetic Induction
Quiz 3
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Q.1
An open coil has
Zero resistance and inductance
Infinite resistance and zero inductance
Infinite resistance and normal inductance
Zero resistance and high inductance
Q.2
The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is
4 mH
5 mH
6 mH
12 mH
Q.3
Reversing the field or the current will reverse the force on the conductor.
Yes
No
Q.4
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.5
The law that the induced e.m.f. and current always oppose the cause producing them is due to
Faraday
Lenz
Newton
Coulomb
Q.6
The core of a coil has a length ofmm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be
3 mH
12 mH
24 mH
48 mH
Q.7
Mutually inductance between two magnetically coupled coils depends on
Permeability of the core
The number of their turns
Cross-sectional area of their common core
All of the above
Q.8
Lenz's law is a consequence of the law of conservation of
Induced current
Charge
Energy
Induced e.m.f.
Q.9
A crack in the magnetic path of an inductor will result in
Unchanged inductance
Increased inductance
Zero inductance
Reduced inductance
Q.10
A conductor carriesamperes of current underto a magnetic field of 1.1 tesla. The force on the conductor will be nearly
50 N
120 N
240 N
480 N
Q.11
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.12
An average voltage ofV is induced in aturns 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.13
In case of an inductance, current is proportional to
Voltage across the inductance
Magnetic field
Both A and B
Neither A)nor B
Q.14
A laminated iron core has reduced eddy-current losses because
More wire can be used with less 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.15
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.16
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.17
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.18
Air-core coils are practically free from
Hysteresis losses
Eddy current losses
Both A and B
None of the above
Q.19
Higher the self-inductance of a coil,
Lesser its weber-turns
Lower the e.m.f. induced
Greater the flux produced by it
Longer the delay in establishing steady current through it
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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