EE TERMS - UNDERGROUND - PT. 2
Unit for quantity of electricity is
Ampere-hour
Watt
joule
Coulomb
The Biot-savart’s law is a general modification of
Kirchhoffs law
Lenz’s law
Ampere’s law
Faraday’s laws
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
The commonly used material for shielding or screening magnetism is
Copper
Aluminium
Soft iron
Brass
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
A permanent magnet
Attracts some substances and repels others
Attracts all paramagnetic substances and repels others
Attracts only ferromagnetic substances
Attracts ferromagnetic substances and repels all others
The retentivity (a property) of material is useful for the
construction of
permanent magnets
Transformers
Non-magnetic substances
Electromagnets
The relative permeability of materials is not constant.
Diamagnetic
Paramagnetic
Ferromagnetic
insulating
The materials are a bit inferior conductors of magnetic flux than
air.
Ferromagnetic
Paramagnetic
Diamagnetic
Dielectric
Hysteresis loop in case of magnetically hard materials is more in
shape as compared to magnetically soft materials.
Circular
Triangular
Rectangular
None of the above
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
2M
M/4
A keeper is used to
Change the direction of magnetic lines
Amplify flux
Restore lost flux
Provide a closed path for flux
Magnetic moment is a
Pole strength
Universal constant
Scalar quantity
Vector quantity
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
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
The magneto-motive 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
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
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
Which of the following statements is correct ?
The magnetic flux inside an exciting coil is lower than its outside surface
The magnetic flux inside an exciting coil is zero
The magnetic flux inside the exciting coil is greater than its outside surface
The magnetic flux inside the exciting coil is same as on its outside surface
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
The magnetic reluctance of a material
Decreases with increasing cross sectional area of material
Increases with increasing cross-sec-tional area of material
Does not vary with increasing cross-sectional area of material
Any of the above
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
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
In a simple magnetic field the strength of magnet flux
Is constant and has same value in energy part of the magnetic field
Increases continuously from initial value to final value
Decreases continuously from initial value to final value
first increases and then decreases till it becomes zero
The stray line of magnetic flux is defined as
A line vertical to the flux lines
The mean length of a ring shaped coil
a line of magnetic flux in a non-uniform field
A line of magnetic flux which does not follow the designed path
The bar magnet has
The dipole moment
Monopole moment
(a) and (b) both
None of the above
Which of the following materials are diamagnetic ?
Silver
Copper
Silver and copper
Iron
Which of the following type of materials are not very important for
engineering applications ?
Ferromagnetic
Paramagnetic
Diamagnetic
None of the above
The susceptibility of paramagnetic materials generally lies between
KT3 and 1CT6
1CT3 and 1CT7
KT4 and KT8
10″2 and KT5
For which of the following materials the saturation value is the
highest ?
Ferromagnetic materials
Paramagnetic materials
Diamagnetic materials
Ferrites
The magnetic materials exhibit the property of magnetisation because
of
Orbital motion of electrons
Spin of electrons
Spin of nucleus
Either of these
All of the above
For which of the following materials the net magnetic moment should
be zero ?
Diamagnetic materials
Ferrimagnetic materials
Antiferromagnetic materials
Antiferrimagnetic materials
The attraction capacity of electromagnet will increase if the
Core length increases I
Core area increases
flux density decreases
Flux density increases
Which of the following statements is correct ?
The conductivity of ferrites is better than ferromagnetic materials
The conductivity of ferromagnetic materials is better than ferrites
The conductivity of ferrites is very high
The conductivity of ferrites is same as that of ferromagnetic materials
Temporary magnets are used in
loud-speakers
Generators
Motors
All of the above
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
Core of an electromagnet should have
Low coercivity
High susceptibility
Both of the above
none of the above
Magnetism of a magnet can be destroyed by
Heating
Hammering
By inductive action of another magnet
By all above methods
TIPIRIN PIRIN TPIRIN
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