EE TERMS - UNDERGROUND - PT. 1
Tesla is a unit of
Field strength
Inductance
Flux density
Flux
A permeable substance is one
Which is a good conductor
Which is a bad conductor
Which is a strong magnet
Through which the magnetic lines of force can pass very easily
The materials having low retentivity are suitable for making
Weak magnets
Temporary magnets
Permanent magnets
None of the above
A magnetic field exists around
Iron
Copper
Aluminum
Moving charges
Ferrites are materials.
Paramagnetic
Diamagnetic
Ferromagnetic
None of the above
Air gap has_______eluctance as compared to iron or steel path
Little
Lower
higher
Zero
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
Which of the following is a vector quantity ?
Relative permeability
Magnetic field intensity
Flux density
Magnetic potential
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
A material which is slightly repelled by a magnetic field is known as
Ferromagnetic material
Diamagnetic material
Paramagnetic material
conducting material
When an iron piece is placed in a magnetic field
The magnetic lines of force will bend away from their usual paths in order to go away from the piece
The magnetic lines of force will bend away from their usual paths in order to pass through the piece
The magnetic field will not be affected
The iron piece will break
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
The ratio of intensity of magnetisation to the magnetisation force is
known as
Flux density
Susceptibility
Relative permeability
None of the above
Magnetising steel is normals difficult because
It corrodes easily
it has high permeability
It has high specific gravity
It has low permeability
The left hand rule correlates to
current, induced e.m.f. And direction of force on a conductor
Magnetic field, electric field and direction of force on a conductor
Self induction, mutual induction and direction of force on a conductor
Current, magnetic field and direction of force on a conductor
The unit of relative permeability is
Henry/metre
Henry
Henry/sq. m
It is dimensionless
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
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
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
Indicate which of the following material does not retain magnetism
permanently.
Soft iron
Stainless steel
Hardened steel
None of the above
The main constituent of permalloy is
Cobalt
Chromium
Nickel
Tungsten
The use of permanent magnets is. Not made in
Magnetoes
Energy meters
Transformers
Loud-speakers
Paramagnetic materials have relative permeability
Slightly less than unity
Equal to unity
Slightly more than unity
Equal to that ferromagnetic materials
Degaussing is the process of
removal of magnetic impurities
Removing gases from the materials
Remagnetising metallic parts
Demagnetising metallic parts
Substances which have permeability less than the permeability of free
space are known as
ferromagnetic
Paramagnetic
Diamagnetic
Bipolar
Two infinitely long parallel conductors in vacuum any separated 1
metre between centers >then a current of 1 ampere flows the. Uk each
conductor, produce on each other a force of
2 x 1(T2 N/m)
2 x KT3 N/m
2 x 10″5 N/m
2x 1(T7 N/m)
In the left hand rule, forefinger always represents
Voltage
current
Magnetic field
Direction of force on the conductor
Which of the following is a ferromagnetic material ?
Tungsten
Aluminium
Copper
Nickel
Ferrites are a sub-group of
Non-magnetic materials
ferro-magnetic materials
Paramagnetic materials
Ferri-magnetic materials
Gilbert is a unit of
Electromotive force
Magnetomotive force
Conductance
Permittivity
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
Reciprocal of permeability is
Reluctivity
Susceptibility
Permittivity
Conductance
The relative permeability is less than unity is case of
Ferromagnetic materials
ferrites
Non-ferrous materials
Diamagnetic materials
Which of the following is the unit of magnetic flux density ?
Weber
Lumens
tesla
None of the above
The magnetism left in the iron after exciting field has been removed
is known as
Permeance
Residual magnetism
Susceptance
Reluctance
Which of the following is not a unit of flux?
Maxwell
Tesla
Weber
All of the above
Which of the following is expected to have the maximum permeability ?
Brass
Copper
Zinc
Ebonite
One telsa is equal to
1 Wb/mm2
1 Wb/m
1 Wb/m2
1 mWb/m2
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
When a magnet is in motion relative to a coil the induced e.m.f. does
not depend upon
resistance of the coil
Motion of the magnet
Number of turns of the coil
Pole strength of the magnet
When two ends of a circular uniform wire are joined to the terminals
of a battery, the field at the center of the circle
Will be zero
Will be infinite
Will depend on the amount of e.m.f. applied
Will depend on the radius of the circle
Susceptibility is positive for
Non-magnetic substances
Diamagnetic substances
Ferromagnetic substances
None of the above
Two long parallel conductors carry 100 A. If the conductors are
separated by 20 mm, the force per meter of length of each conductor will be
100 N
10 N
1 N
0.1 N
Two long parallel conductors carry 100 A. If the conductors are
separated by 20 mm, the force per meter of length of each conductor will be
100 N
10 N
1 N
0.1 N
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
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
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
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
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
The unit of flux is the same as that of
Reluctance
Resistance
Permeance
Pole strength
{"name":"EE TERMS - UNDERGROUND - PT. 1", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"Tesla is a unit of, A permeable substance is one, The materials having low retentivity are suitable for making","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}
More Surveys
Make your own Survey
- it's free to start.
- it's free to start.