56. The ratio of
the total flux (flux in iron path)
to the useful flux (flux in air gap)
the total flux (flux in iron path)
to the useful flux (flux in air gap)
A. Leakage flux
B. Leakage current
C. Leakage
coefficient
coefficient
D. Leakage factor
57. Defined
as the number of lines per unit area through any substance in a plane at right angles to the lines of force
as the number of lines per unit area through any substance in a plane at right angles to the lines of force
A. Flux
B. Flux lines
C. Flux
density
density
D. Flux intensity
58. Defined as the
flux density produced in it due to its own induced magnetism
flux density produced in it due to its own induced magnetism
A. Magnetic field intensity
B. Electric field intensity
C. Electromagnetic
field intensity
D. Intensity magnetization
59. The
force acting on a unit n- pole
placed at that point is called
force acting on a unit n- pole
placed at that point is called
A. Magnetic field intensity
B. Electric field intensity
C. Electromagnetic
field intensity
field intensity
D. Intensity magnetization
60. The
ratio between the intensity of magnetization
produced in a substance to the magnetizing force producing it
ratio between the intensity of magnetization
produced in a substance to the magnetizing force producing it
A. Magnetic Reluctivity
B. Magnetic Resistivity
C. Magnetic susceptibility
D. Magnetic conductivity
61. The lagging
effect between flux density of the material and the magnetizing force applied
A. Permeance
B. Eddy current
C. Hysteresis
D. Reluctance
62. Refers
to the magnetic lines
A. Flux
B. Hysteresis
C. Current
D. Magnetomotive force
63. Refers
to the non- metallic materials that
have the ferromagnetic properties of iron.
to the non- metallic materials that
have the ferromagnetic properties of iron.
A.
Ferrites
Ferrites
B. Ferromagnetic
C. Diamagnetic
D. Paramagnetic
64. The
air space between poles of magnets
air space between poles of magnets
A. Air
gap
gap
B. Free space
C. Vacuum
D. Atmosphere
65. One that
has magnetic poles
produced by internal
atomic structure with no external current
necessary
has magnetic poles
produced by internal
atomic structure with no external current
necessary
A. Diamagnetic
B. Permanent magnets
C. Paramagnetic
D. Electromagnetic
66. Magnetic
effects of the earth as a huge magnet with
north and south poles.
effects of the earth as a huge magnet with
north and south poles.
A. Diamagnetic
B. Ferromagnetic
C. Terrestrial magnetism
D. Terrestrial ferromagnetism
67. Used to
maintain strength of magnetic field
maintain strength of magnetic field
A. Container
B. Air gap
C. Keeper
D. Source
68. All
magnetic field originates from
magnetic field originates from
A. moving electric charge
B. Iron atoms
C. Magnetic domain
D. Permanent magnets
69. Magnetic fields do not interact with
A. Moving
permanent magnets
permanent magnets
B. Stationary
permanent magnets
permanent magnets
C. Moving electric
charges
charges
D. Stationary electric charges
70. The magnetic
field inside a solenoid
field inside a solenoid
A. is zero
B. is uniform
C. increases with
distance from the axis
distance from the axis
D. decreases with
distance from the axis
distance from the axis
71. When
the ferromagnetic substance is inserted
in a current- carrying
solenoid, the magnetic field is
the ferromagnetic substance is inserted
in a current- carrying
solenoid, the magnetic field is
A. Greatly decreased
B. Greatly increased
C. Slightly decreased
D. Slightly increased
72. The magnetic
field of a bar magnet most closely
resembles the magnetic field of
field of a bar magnet most closely
resembles the magnetic field of
A. a horseshoe magnet
B. a straight
current- carrying wire
current- carrying wire
C. a stream of
electrons moving parallel to one another
electrons moving parallel to one another
D. a current- carrying wire loop
73. The
magnetic field of a magnetized iron bar when strongly heated
magnetic field of a magnetized iron bar when strongly heated
A. Becomes weaker
B. Becomes stronger
C. Reverses in direction
D. is unchanged
74. A permanent magnet does not exert a force on
A. an
unmagnetized iron bar
unmagnetized iron bar
B. a magnetized
iron bar
iron bar
C. a moving
electric charge
electric charge
D. a
stationary electric charge
stationary electric charge
75. A
current if flowing east along a
power line. If the earth’s field is neglected,
the direction of the magnetic field below it is
current if flowing east along a
power line. If the earth’s field is neglected,
the direction of the magnetic field below it is
A. North
B. South
C. East
D. West
76. The emf produced in a wire by its motion across a magnetic field does not depend upon the
A. Diameter of the wire
B. Length of the wire
C. Orientation of
the wire
the wire
D. Flux density of the field
77. The
induced emf in a wire loop that is moved parallel to a uniform magnetic field is
induced emf in a wire loop that is moved parallel to a uniform magnetic field is
A. Zero
B. Dependent on
the area of the loop
the area of the loop
C. Dependent on
the shape of the loop
the shape of the loop
D. Dependent on
the magnitude of the field
the magnitude of the field
78. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every revolution
A. 1/3
B. 1/2
C. 1/4
D. 2/3
79. The magnetic
flux through a wire loop in a
magnetic field does not depend on
flux through a wire loop in a
magnetic field does not depend on
A. The area of
the loop
the loop
B. The magnitude
of the field
of the field
C. The shape of the loop
D. The angle
between the plane of the loop and the direction
between the plane of the loop and the direction
80. Steel
is hard to magnetize because of its
A. Low permeability
B. High permeability
C. High density
D. High retentivity
81. Paramagnetic
substance has a relative permeability of
A. Slightly less
than one
than one
B. Equal to one
C. Slightly equal to one
D. Very much
greater than one
greater than one
82. A group of
magnetically aligned atoms is called
magnetically aligned atoms is called
A. Range
B. Lattice
C. Domain
D. Crystal
83. The
force between two magnetic poles varies with the distance between them. The
variation is to
the square of that distance.
force between two magnetic poles varies with the distance between them. The
variation is to
the square of that distance.
A. Equal
B. Greater than
C. Directly proportional
D.
Inversely proportional
Inversely proportional
84. Permeability means
A. The
conductivity of the material for magnetic lines of force
conductivity of the material for magnetic lines of force
B. The
magnetization test in the material
after exciting field has been removed
magnetization test in the material
after exciting field has been removed
C. The strength
of an electromagnet
of an electromagnet
D. The strength
of the permanent magnet
of the permanent magnet
85. is an
electromagnet with its core in the
form of a close magnetic ring.
electromagnet with its core in the
form of a close magnetic ring.
A. Solenoid
B. Paraboloid
C. Toroid
D. Cycloid
86. A
magnetic material losses its ferromagnetic properties at a point called
magnetic material losses its ferromagnetic properties at a point called
A. Curie temperature
B. Inferred
absolute temperature
absolute temperature
C. Room temperature
D. Absolute temperature
87. Small voltages
generated by a conductor with current in an
external magnetic field.
generated by a conductor with current in an
external magnetic field.
A. Skin effect
B. Magnetic effect
C. Hall
effect
D. Flywheel Effect
88. The emission
of electrons from hot bodies is called
of electrons from hot bodies is called
A. Radiation effect
B. Edison effect
C. Skin effect
D. Half effect
89. The
ability of a mechanically stressed
ferromagnetic wire to recognize rapid switching of magnetization when subjected
to a dc magnetic field.
ability of a mechanically stressed
ferromagnetic wire to recognize rapid switching of magnetization when subjected
to a dc magnetic field.
A. Wartheim effect
B. Wiedemann effect
C. Wiegand effect
D. Edison effect
90. An effect
which is generally used in the gausameter to measure flux density.
which is generally used in the gausameter to measure flux density.
A. Skin effect
B. Magnetic effect
C. Hall
effect
D. Flywheel effect
91. The
contribution to the ionization in an ionization chamber by electrons liberated
from the walls.
contribution to the ionization in an ionization chamber by electrons liberated
from the walls.
A. Skin effect
B. Walt
effect
C. Hall effect
D. Edison effect
92. The
tiniest element of matter
A. Atom
B. Proton
C. Electron
D. Neutron
93. All matters
(gas, liquid and solid) are composed of
(gas, liquid and solid) are composed of
A. Neutrons
B. Particles
C. Electrons
D. Atoms
94. The simplest
type of atom to exist is the atom.
type of atom to exist is the atom.
A. Helium
B. Hydrogen
C. Boron
D. Oxygen
95. What revolves
about the positive nucleus in a
definite orbit?
about the positive nucleus in a
definite orbit?
A. Atom
B. Proton
C. Electron
D. Neutron
96. The uncharged
particles which have no effect on
its atomic charge.
particles which have no effect on
its atomic charge.
A. Nucleons
B. Electrons
C. Protons
D. Neutrons
97. The diameter
of a hydrogen atom is approximately cm.
of a hydrogen atom is approximately cm.
A. 1.1 x 10^-6
B. 1.1 x 10^-7
C.
1.1 x 10^-8
1.1 x 10^-8
D. 1.1 x 10^-9
98. The K shell or
the first shell has how many
permissible number of orbiting electrons?
the first shell has how many
permissible number of orbiting electrons?
A. 1
B. 2
C. 3
D. 4
99. Germanium atom has protons and electrons.
A. 32,
32
32
B.
32, 42
32, 42
C.
42, 32
42, 32
D.
34, 34
34, 34
100. A germanium
atom has an atomic weight of 72. How many neutrons are there?
atom has an atomic weight of 72. How many neutrons are there?
A. 32
B. 40
C. 34
D. 36
101. How many
neutrons does a copper atom have?
neutrons does a copper atom have?
A. 32
B. 33
C. 34
D. 29
102. Bonding
of atoms that is due to the force of
attraction between positive ions and a group of negative ions
of atoms that is due to the force of
attraction between positive ions and a group of negative ions
A. Ionic bond
B. Covalent Bond
C. Electrostatic
Bond
Bond
D. Metallic bond
103. An
alloy of 22 percent iron and 78 per cent nickel.
alloy of 22 percent iron and 78 per cent nickel.
A. Permalloy
B. Alnico
C. Constantan
D. Manganin