Conductivity is analogous to
Conductivity is analogous to
Laminated cores, in electrical machines, are used to reduce
Laminated cores, in electrical machines, are used to reduce
A material for good magnetic memory should have
A material for good magnetic memory should have
The relative permeability of a ferromagnetic material is
The relative permeability of a ferromagnetic material is
Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss.
Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss.
Conductance is analogous to
Conductance is analogous to
Reciprocal of reluctance is
Reciprocal of reluctance is
The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs
The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?
Hysteresis loss least depends on
Hysteresis loss least depends on
The unit of magnetic flux is
The unit of magnetic flux is
In a magnetic material hysteresis loss takes place primarily due to
In a magnetic material hysteresis loss takes place primarily due to
Hard steel is suitable for making permanent magnets because
Hard steel is suitable for making permanent magnets because
The unit of reluctance is
The unit of reluctance is
Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it
Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it
Silicon steel is used in electrical machines because it has
Silicon steel is used in electrical machines because it has
Permanent magnets are normally made of
Permanent magnets are normally made of
A ferrite core has less eddy current loss than an iron core because
A ferrite core has less eddy current loss than an iron core because
The property of a material which opposes the creation of magnetic flux in it is known as
The property of a material which opposes the creation of magnetic flux in it is known as
The unit of retentivity is
The unit of retentivity is
Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity.
Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity.
Permeability in a magnetic circuit corresponds to_________ in an electric circuit.
Permeability in a magnetic circuit corresponds to_________ in an electric circuit.
Relative permeability of vacuum is
Relative permeability of vacuum is
When both the inductance and resistance of a coil are doubled the value of
When both the inductance and resistance of a coil are doubled the value of
An air gap is usually inserted in magnetic circuits to
An air gap is usually inserted in magnetic circuits to
The rate of rise of current through an inductive coil is maximum
The rate of rise of current through an inductive coil is maximum
Energy stored by a coil is doubled when its current is increased by percent.
Energy stored by a coil is doubled when its current is increased by percent.
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
