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.2.
Which of the following is a ferromagnetic material?
Tungsten
Aluminium
Copper
Nickel
Q.3.
Air gap has_______eluctance as compared to iron or steel path
little
lower
higher
zero
Q.4.
Degaussing is the process of
removal of magnetic impurities
removing gases from the materials
remagnetising metallic parts
demagnetising metallic parts
Q.5.
The use of permanent magnets is. not made in
magnetoes
energy meters
transformers
loud-speakers
Q.6.
The materials are a bit inferior conductors of magnetic flux than air.
ferromagnetic
paramagnetic
diamagnetic
dielectric
Q.7.
The susceptibility of paramagnetic materials generally lies between
KT3 and 1CT6
1CT3 and 1CT7
KT4 and KT8
10"2 and KT5
Q.8.
One telsa is equal to
1 Wb/mm²
1 Wb/m
1 Wb/m²
1 mWb/m²
Q.9.
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.10.
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.11.
Magnetic moment is a
pole strength
universal constant
scalar quantity
vector quantity
Q.12.
Susceptibility is positive for
non-magnetic substances
diamagnetic substances
ferromagnetic substances
none of the above
Q.13.
Which of the following materials are diamagnetic?
Silver
Copper
Silver and copper
Iron
Q.14.
Magnetising steel is normals difficult because
it corrodes easily
it has high permeability
it has high specific gravity
it has low permeability
Q.15.
For which of the following materials the saturation value is the highest?
Ferromagnetic materials
Paramagnetic materials
Diamagnetic materials
Ferrites
Q.16.
Reciprocal of permeability is
reluctivity
susceptibility
permittivity
conductance
Q.17.
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.18.
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.19.
A material which is slightly repelled by a magnetic field is known as
ferromagnetic material
diamagnetic material
paramagnetic material
conducting material
Q.20.
Amm long conductor is carrying a current ofA and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be
240 N
24 N
2.4 N
0.24 N
Q.21.
Indicate which of the following material does not retain magnetism permanently.
Soft iron
Stainless steel
Hardened steel
None of the above
Q.22.
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be
zero
BLI
B2LI
BLI2
Q.23.
The relative permeability is less than unity is case of
ferromagnetic materials
ferrites
non-ferrous materials
diamagnetic materials
Q.24.
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.25.
Which of the following is the unit of magnetic flux density?
Weber
Lumens
Tesla
None of the above
Q.26.
Gilbert is a unit of
electromotive force
magnetomotive force
conductance
permittivity
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