Electrical Eng. · Question Bank

Electromagnetics

350 questions · page 7 of 18. Answer in your head first, then check the solution.

#121
A nuclei with common number of protons, but with different number of neutrons.
Afission
Bisotopes
Catom
Dcore
#122
A one cubic cm. of copper has how many free electrons at room temperature?
A\( 80 \\times \(10^{18}\) \)
B8.\( 5 \\times \(10^{22}\) \)
C\( 20 \\times \(10^{10}\) \)
D\( 50 \\times \(10^{20}\) \)
#123
A principle that states that only two electrons with different spins are allowed to exist in a given orbit.
ABohr's principle
BPauli exclusion principle
CAvogadro's principle
DCoulomb's principle
#124
A type of material which usually has four valence electrons.
Ainsulator
Bsemiconductor
Cconductor
DIGFET
#125
AT/m is a unit of
Ammf
Bmagnetizing force
Creluctance
Dmagnetic flux density
#126
Amorphous solid is also called
Acrystalline
Bnon-crystalline
Cpolycrystalline
Dhomogenous
#127
Amount of additional energy required for electronic emmission of metals
Aelectronvolt
Bwork function
Cband gap
DMeV
#128
An energy band in which electrons can move freely.
Avalence band
Bconduction band
Cenergy gap
Dinsulation band
#129
Approximate mass at rest of a proton is _____ to that of a neutron.
Agreater than
Bequal
Cless than
Dcomparable
#130
Cobalt is an example of a ________ material
Adiamagnetic
Bferromagnetic
Cparamagnetic
Dmagnetic
#131
Core materials of a good relay have _____ hysteresis loop.
Alarge
Bnarrow
Cvery large
Dvery narrow
#132
Defined as a closed path in which magnetic induction or flux flows.
Aelectric circuit
Bmagnetic circuit
Celectronic circuit
Delectromagnetic circuit
#133
Electric charge of neutron is the same as
Aproton
Batom
Celectron
Dcurrent
#134
Electric field intensity is
Aa scalar quantity
Ba vector quantity
Can absolute value
Da relative value
#135
Electric flux density is a/an __________ quantity.
Ascalar
Bvector
Cabsolute
Drelative
#136
Electron emitted by the mechanical impact of an ion striking a surface is called
Aprimary electrons
Bsecondary electrons
Cmoderately doped electrons
Dpolarized charge
#137
Gases with charged particles
Ainert
Bplasma
Cconductive
Dreactive
#138
How does permittivity affect electric field intensity?
AIt causes the field intensity to increase
BIt causes the field intensity to decrease
CIt causes the field intensity to fluctuate up and down
DIt has no effect on field intensity
#139
Hydrogen is an example of a _____ material.
Aparamagnetic
Bdiamagnetic
Cferromagnetic
Dnon-magnetic
#140
Hysteresis loss can be reduced by the following.
Aincreasing mmf of the circuit
Busing material of narrow hysteresis loop
Cusing ferromagnetic core
Dlaminating the magnetic circuit

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