What is the SI unit of specific resistance or resistivity?
Ohm-circular mil per inch
Ohm-circular mil per foot
Ohm-m
Ohm-cm
Correct Answer :
C. Ohm-m
Related Questions
Permeability means
The conductivity of the material for magnetic lines of force
The magnetization test in the material after exciting field has been removed
The strength of an electromagnet
The strength of the permanent magnet
What is the SI unit of conductivity?
Ohms/m
Ohms-m
Siemens-m
Siemens/m
The amount of magnetizing force to counter balance the resid magnetic material is referred to as
Reluctivity
Susceptivity
Coercivity
Retentivity
The unit of flux density is
Wb/m
Tesla
At/m
N/Wb
The current of electric circuit is analogous to which quantity of a m
Mmf
Flux
Flux density
R eluctivity
Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
Leading effect
Ratio
Equality
Lagging effect
Amorphous solid is also called
Crystalline
Non- crystalline
Polycrystalline
Homogenous
The force between two magnetic poles is _______ their pole strengths.
directly proportional to
the sum of
inversely proportional to
the product of
If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's law is about
400 V
100 V
200 V
600 V
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 evaporation of electrons from a heated surface is called
Radiation
Convection
Thermionic emission
Conduction
The B-H curve of ________ is not a straight line.
air
wood
silicon steel
soft iron
The core of a magnetic equipment uses a magnetic material with
Least permeability
Low permeability
Moderate permeability
High permeability
______ is an electromagnet with its core in the form of a close magnetic ring.
S olenoid
Paraboloid
Toroid
Cycloid
The emf induced in a coil due to the changing current of another neighboring coil is called
Mutually induced emf
Self induced emf
Statically induced emf
Dynamically induced emf
What is the SI unit of reluctance?
At
At/m
N/Wb
At/Wb
What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
What determines the value of the temperature coefficient of resistance of a material?
length
cross-sectional area
volume
nature and temperature
The electrons in the last orbit of an atom are called _______ electrons.
free
valence
bound
thermionic
The force acting on a unit n- pole placed at that point is called
Magnetic field intensity
Electric field intensity
Electromagnetic field intensity
Intensity magnetization
The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as
Joule's Law
Faraday's second law of electromagnetic induction
Faraday's first law of electromagnetic induction
Coulomb's Law
The property of a material which opposes the creation of magnetic flux in it
Resistance
Reluctance
Permeance
Conductance
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
Electron is a Greek word for
amber
Fire
Stone
Heat
The mass of proton is __________ the mass of an electron.
equal to
about 1837 times
less than
200 tim es
If the number of valence electrons of an atom is less than 4a then the substance is probably
a metal
an insulator
a non-metal
a semiconductor
A law that states that the current in a thermionic diode varies directly with the three- halves power of anode voltage and inversely with the square of the distance between the electrodesa provided operating conditions are such that the current is limited only by the space charge.
Hall's law
Joule's law
Child's law
Coulomb's law
The diameter of a hydrogen atom is approximately ______ cm.
1.1 x 10^-6
1.1 x 10^7
1.1 x 10^-8
1.1 x 10^-9
What is another name for relative permittivity?
Dielectric strength
Electric intensity
Potential gradient
Dielectric constant
The branch of Engineering which deals with the magnetic effect of electric current is known as
Magnetism
Electromagnetism
Electrical engineering
Electronics engineering