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Electrical Engineering
Magnetism And Electromagnetism
Quiz 2
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Q.1
How does the magnetic compass needle behave in a magnetic field?
It assures a position right angle to magnetic field
It starts rotating
It assures a position which follows a line of magnetic flux
None of the above
Q.2
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is
proportional to 7
proportional to X
proportional to distance between the conductors
inversely proportional to I
Q.3
Magnetising steel is normals difficult because
it corrodes easily
it has high permeability
it has high specific gravity
it has low permeability
Q.4
The change of cross-sectional area of conductor in magnetic field will affect
reluctance of conductor
resistance of conductor
(A) and (B) both in the same way
none of the above
Q.5
The direction of magnetic lines of force is
from south pole to north pole
from north pole to south pole
from one end of the magnet to another
none of the above
Q.6
Reciprocal of permeability is
reluctivity
susceptibility
permittivity
conductance
Q.7
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?
Decreases
Increases
Remains same
First increases and then decreases depending on the depth of iron in¬sertion
Q.8
One telsa is equal to
1 Wb/mm²
1 Wb/m
1 Wb/m²
1 mWb/m²
Q.9
The susceptibility of paramagnetic materials generally lies between
KT3 and 1CT6
1CT3 and 1CT7
KT4 and KT8
10"2 and KT5
Q.10
The magnetic materials exhibit the property of magnetisation because of
orbital motion of electrons
spin of electrons
spin of nucleus
either of these
Q.11
A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be
M
M/2
2 M
M/4
Q.12
Main causes of noisy solenoid are
strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force
uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts
both of above
none of the above
Q.13
For which of the following materials the saturation value is the highest?
Ferromagnetic materials
Paramagnetic materials
Diamagnetic materials
Ferrites
Q.14
Magnetic moment is a
pole strength
universal constant
scalar quantity
vector quantity
Q.15
The materials are a bit inferior conductors of magnetic flux than air.
ferromagnetic
paramagnetic
diamagnetic
dielectric
Q.16
Which of the following is the unit of magnetic flux density?
Weber
Lumens
Tesla
None of the above
Q.17
Indicate which of the following material does not retain magnetism permanently.
Soft iron
Stainless steel
Hardened steel
None of the above
Q.18
For a given wire-wound 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.19
In the left hand rule, forefinger always represents
voltage
current
magnetic field
direction of force on the conductor
Q.20
The most effective and quickest may of making a magnet from soft iron is by
placing it inside a coil carrying current
induction
the use of permanent magnet
rubbing with another magnet
Q.21
Gilbert is a unit of
electromotive force
magnetomotive force
conductance
permittivity
Q.22
A magnetic field exists around
iron
copper
aluminium
moving charges
Q.23
What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m?
2 AT
4 AT
6 AT
10 AT
Q.24
Substances which have permeability less than the permeability of free space are known as
Ferromagnetic
Paramagnetic
Diamagnetic
Bipolar
Q.25
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
63.38 N/Wb
633.8 N/Wb
6338 N/Wb
63380 N/Wb
Q.26
The magnetomotive force is
the voltage across the two ends of exciting coil
the flow of an electric current
the sum of all currents embraced by one line of magnetic field
the passage of magnetic field through an exciting coil
Q.27
The relative permeability is less than unity is case of
ferromagnetic materials
ferrites
non-ferrous materials
diamagnetic materials
Q.28
The Biotsavart's law is a general modification of
Kirchhoff's law
Lenz's law
Ampere's law
Faraday's laws
Q.29
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?
2
4
6
8
Q.30
Materials subjected to rapid reversal of magnetism should have
large area oiB-H loop
high permeability and low hysteresis loss
high co-ercivity and high retentivity
high co-ercivity and low density
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