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Magnetic Circuit
Quiz 3
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Q.1
For a given wirewound core, an increase in current through the coil
reverses the flux lines
decreases the flux density
increases the flux density
causes no change in flux density
Q.2
The induced voltage across a coil withturns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
1,000 V
2,000 V
31.25 V
3,125 V
Q.3
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
increases
decreases
remains constant
reaches zero
Q.4
The rate of rise of current through an inductive coil is maximum
At 63.2% of its maximum steady value
At the start of the current flow
After one time constant
Near the final maximum value of current
Q.5
Conductivity is analogous to
Retentivity
Resistivity
Permeability
Inductance
Q.6
The property of a material which opposes the creation of magnetic flux in it is known as
Reluctivity
Magneto-motive force
Permeance
Reluctance
Q.7
Hysteresis loss least depends on
Volume of material
Frequency
Steinmetz’s coefficient of material
Ambient temperature
Q.8
The unit of reluctance is
Meter/Henry
Henry/meter
Henry
1/Henry
Q.9
Hard steel is suitable for making permanent magnets because
It has good residual magnetism
Its hysteresis loop has large area
Its mechanical strength is high
Its mechanical strength is low
Q.10
Energy stored by a coil is doubled when its current is increased by percent.
25
50.14
41.4
100
Q.11
The relative permeability of a ferromagnetic material is
Less than one
More than one
More than 10
More than 100 Ωr 1000
Q.12
The unit of retentivity is
Weber
Weber/sq. m
Ampere turn/meter
Ampere turns
Q.13
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
Zero
Small
Large
None of the above
Q.14
When both the inductance and resistance of a coil are doubled the value of
Time constant remains unchanged
Initial rate of rise of current is doubled
Final steady current is doubled
Time constant is halved
Q.15
Conductance is analogous to
Permeance
Reluctance
Flux
Inductance
Q.16
A ferrite core has less eddy current loss than an iron core because
Ferrites have high resistance
Ferrites are magnetic
Ferrites have low permeability
Ferrites have high hysteresis
Q.17
Permanent magnets are normally made of
Alnico alloys
Aluminium
Cast iron
Wrought iron
Q.18
Reciprocal of reluctance is
Reluctivity
Permeance
Permeability
Susceptibility
Q.19
Permeability in a magnetic circuit corresponds to_________ in an electric circuit.
Resistance
Resistivity
Conductivity
Conductance
Q.20
In a magnetic material hysteresis loss takes place primarily due to
Rapid reversals of its magnetization
Flux density lagging behind magnetizing force
Molecular friction
It high retentivity
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