Q.1
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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