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Electrical Engineering
Magnetism And Electromagnetism
Quiz 1
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Q.1
A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be
[Hint. Torque = 2BIlNr N-m]
8 N-m
0.48 N-m
0.048 N-m
0.0048 N-m
Q.2
The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields
meter is surrounded by strong magnetic fields
a soft iron shielding is used
a plastic shielding is provided
a shielding of anon-magnetic material is used
Q.3
The attraction capacity of electromagnet will increase if the
core length increases i
core area increases
flux density decreases
flux density increases
Q.4
Which of the following is expected to have the maximum permeability ?
Brass
Copper
Zinc
Ebonite
Q.5
Tesla is a unit of
field strength
inductance
flux density
flux
Q.6
The bar magnet has
the dipole moment
monopole moment
(A) and (B) both
none of the above
Q.7
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?
2500 AT/m
250 AT/m
25 AT/m
2.5 AT/m
Q.8
The initial permeability of an iron rod is
the highest permeability of the iron rod
the lowest permeability of the iron rod
the permeability at the end of the iron rod
the permeability almost in non-magnetised state
Q.9
Unit for quantity of electricity is
ampere-hour
watt
joule
coulomb
Q.10
If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity
less than that of disc but in opposite direction
equal to that of disc and in the same direction
equal to that of disc and in the opposite direction
less than that of disc and in the same direction
Q.11
The main constituent of permalloy is
cobalt
chromium
nickel
tungsten
Q.12
The unit of relative permeability is
henry/metre
henry
henry/sq. m
it is dimensionless
Q.13
Core of an electromagnet should have
low coercivity
high susceptibility
both of the above
none of the above
Q.14
Fleming's left hand rule is used to find
Direction of magnetic field due to current carrying conductor
Direction of flux in a solenoid
Direction of force on a current carrying conductor in a magnetic field
Polarity of a magnetic pole
Q.15
Ferrites are a sub-group of
non-magnetic materials
ferro-magnetic materials
paramagnetic materials
ferri-magnetic materials
Q.16
The force between two long parallel conductors is inversely proportional to
Radius of conductors
Current in one conductor
Product of current in two conductors
Distance between the conductors
Q.17
Out of the following statements, concerning an electric field, which statement is not true?
The electric intensity is a vector quantity
The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
An electric field is defined as a point in space at which an electric charge would experience a force
Unit field intensity in the exertion of a force of one newton on a charge of one coulomb
Q.18
The ratio of intensity of magnetisation to the magnetisation force is known as
flux density
susceptibility
relative permeability
none of the above
Q.19
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?
22 x 10"8 N
22 x 10"7 N
22 x 10-6 N
22 x 10"5 N
Q.20
The commonly used material for shielding or screening magnetism is
copper
aluminium
soft iron
brass
Q.21
Ferrites are materials.
paramagnetic
diamagnetic
ferromagnetic
none of the above
Q.22
The uniform magnetic field is
the field of a set of parallel conductors
the field of a single conductor
the field in which all lines of magnetic flux are parallel and equidistant
none of the above
Q.23
The use of permanent magnets is. not made in
magnetoes
energy meters
transformers
loud-speakers
Q.24
Degaussing is the process of
removal of magnetic impurities
removing gases from the materials
remagnetising metallic parts
demagnetising metallic parts
Q.25
Air gap has_______eluctance as compared to iron or steel path
little
lower
higher
zero
Q.26
Which of the following is a ferromagnetic material?
Tungsten
Aluminium
Copper
Nickel
Q.27
Susceptibility is positive for
non-magnetic substances
diamagnetic substances
ferromagnetic substances
none of the above
Q.28
Which of the following materials are diamagnetic?
Silver
Copper
Silver and copper
Iron
Q.29
A 300 mm long conductor is carrying a current of 10 A 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.30
A material which is slightly repelled by a magnetic field is known as
ferromagnetic material
diamagnetic material
paramagnetic material
conducting material
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