Electrical Eng. · Question Bank

Electromagnetics

350 questions · page 4 of 18. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
#61
The emf produced in a wire by its motion across a magnetic field does not depend upon
Athe diameter of the wire
Bthe length of the wire
Cthe orientation of the wire
Dthe flux density of the field
#62
The energy gap bet. valence & conduction band of a conductor is in the order of
A0 eV
B1 eV
C5 eV
D10 eV
#63
The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
A5 N/Wb
B25 N/Wb
C125 N/Wb
D0.2 N/Wb
#64
The force acting on a unit n-pole placed at that point is called
Amagnetic field intensity
Belectric field intensity
Celectromagnetic field intensity
Dintensity magnetization
#65
The force between two magnetic poles is _____ their pole strengths.
Adirectly proportional to
Bthe sum of
Cinversely proportional to
Dthe product of
#66
The highest energy band of an atom which can be filled with electrons.
Avalence band
Bconduction band
Cinsulation band
Denergy level
#67
The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
Azero
Bdependent on the area of the loop
Cdependent on the shape of the loop
Ddependent on the magnitude of the field
#68
The longer the wire, the ________ the resistance.
Ahigher
Blesser
Charder
Dsmaller
#69
The magnetic field of a magnetized iron bar when strongly heated
Abecomes weaker
Bbecomes stronger
Creverses direction
Dis unchanged
#70
The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
Aoppose the change
Baid the change
Ceither oppose or aid the change
Dneither oppose nor aid the change
#71
The magnetic potential in a magnetic circuit can be measured in terms of
Ammf
Bemf
Cfarad
Dcoulomb
#72
The maximum permissible number of electrons in the third orbit is
A18
B8
C32
D2
#73
The permeability of permalloy is
Avery much greater than the permeability of air
Bslightly greater than permeability of air
Cslightly less than permeability of air
Dequal to the permeability of air
#74
The phenomenon by which a substance attracts pieces of iron
Amagnetism
Belectromagnetism
Cnaturalism
Dmaterialism
#75
The phenomenon that when an electric current passes through an arisotropic crystal, there is an absorption or liberation of heat due to the nonuniformity in the current distribution.
ABridgman effect
BCorona effect
CDember effect
DDestriau effect
#76
The physical motion resulting from the forces of magnetic fields is called
Amotor action
Brotation
Crepulsion
Dtorque action
#77
The physical motion resulting from the forces of magnetic fields
Amotor action
Blinear motion
Crectilinear motion
Dgenerator action
#78
The point in a magnet where the intensity of magnetic lines of force is maximum
Amagnetic pole
Bsouth pole
Cnorth pole
Dunit pole
#79
The process by which an emf and hence current is generated or induced in an inductor when there is a change in the magnetic flux linking the conductor is called
Aelectromagnetic induction
Bmutual induction
CFaraday's law
Delectromagnetic interference
#80
The property of the magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
Aretentivity
Breluctivity
Cresistivity
Dconductivity

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