The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
Leakage flux
Leakage current
Leakage coefficient
Leakage factor
Correct Answer :
D. Leakage factor
Related Questions
If the value of 25 a conductor is 1/255 per oCa then the value of 20is
1/300 per oC
1/250 peroC
1/230 per oC
1/260 per oC
Which of the following has the least number of valence electrons?
Conductor
Semiconductor
Insulator
Semi- insulator
A t/m is a unit of
Mmf
Emf
Reluctance
Magnetizing force
Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
63000 N
63 × 10^-3 N
8 × 10^12 N
796 kN
Core materials of a good relay have _________ hysteresis loop.
large
narrow
very large
very narrow
Which of the following is used by permanent magnets as the magnetic material?
iron
nickel
soft steel
hardened steel
The process by which an emf and hence current is generated or induced in a conductor when there is a change in the magnetic flux linking the conductor is called
Electromagnetic induction
Mutual induction
Faraday's law
Electromagnetic interference
The force between two magnetic poles is _____ the relative permeability of the medium.
directly proportional to
independent of
inversely proportional to
equal to
An effect which is generally used in the gausameter to measure flux density.
Skin effect
Magnetic effect
Hall effect
Flywheel effect
An atom or a group of atoms that carries a net electric charge.
Positive ion
Negative ion
Ion
Electron
If the distance between two magnetic poles decreases by 2 timesa the force between them
decreases two times
increases four times
increases two times
decreases four times
An electron- volt (eV) is a unit of
Energy
Potential difference
Charge
Momentum
Which of the following is a paramagnetic material?
Carbon
Bismuth
Copper
Oxygen
What is the SI unit of conductivity?
Ohms/m
Ohms-m
Siemens-m
Siemens/m
The physical motion resulting from the forces of magnetic fields is called
Motor action
Rotation
Repulsion
Torque action
What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?
Ionic
Covalent
Metallic
Van der Waals
What principle states that each electron in an atom must have a different set of quantum numbers?
Inclusion principle
Exclusion principle
Quantum principle
Electron principle
Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force
Flux
Flux lines
Flux density
Flux intensity
The ratio of the permeability of material to the permiabiity of air or vacuum.
Relative permeability
Relative permittivity
Relative conductivity
Relative reluctivity
The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
Oppose the change
Aid the change
Either oppose or aid the change
Neither oppose nor aid the change
If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate the direction of magnetic flux produced around the conductor. This is known as
Right hand rule
Left hand rule
Cork screw rule
End rule
The reluctance of a magnetic circuit varies with
length × area
area � length
length � area
length + area
The magnetic energy stored in an inductor is ______ current.
Directly proportional to
Inversely proportional to
Directly proportional to the square of
Inversely proportional to the square of
A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 ?a Calculate the number of ampere turns?
The B-H curve for ________ is a straight line passing through the origin.
cobalt
air
hardened steel
soft iron
Which of the following materials has the highest dielectric strength?
Glass
Oiled paper
Mica
Air
Magnetic field intensity is a ________ quantity.
scalar
phasor
vector
variable
The unit of flux is _____ in cgs system.
Tesia
Gilbert
Maxwell
Oersted
Hysteresis is a phenomenon of _________ in a magnetic circuit.
setting up constant flux
lagging of H behind B
lagging B behind H
leading B ahead H
One farad equals
1 coulomb/volt
1 newton/coulomb
1 newton-meter
1 volt/second/ampere