Chapter 10,13. semiconductors
The ____ rule for conductors can be determine the direction of magnetic lines of force.
left-hand
___ is a measure of magnetic induction represented by magnetic lines of force.
magnetic flux
A ____ substance with a permeability greater than 1.
paramagnetic
A ____ is the time required to produce one complete cycle of a waveform.
period
A materials ability to carry magnetic lines of force is referred to as _____.
permeability
____ is the property of a material that allows the passage of magnetic lines of force.
permeance
The 3 requirements for induction are a conductor, a magnetic field, and ___ motion between the conductor and the field.
relative
____ motion is the speed at which a conductor cuts a magnet field.
relative
____ is the ability of the core material to retain its magnetism after the magnetism after the magnetizing force is removed.
retentivity
A ___ is a solid-state switching device that switches current ON using a quick pulse of control current.
thyristor
AC generators are rated in ___.
volt- amperes
a ____ is the unit of measure for apparent power.
volt-ampere
Alternators are rated in ____.
volt-amperes
A ___ is the distance covered by 1 complete cycle of a given frequency of sound as it passes through the air.
wavelength
A ____ is the unit of total magnetic lines of force.
weber
A conversion factor of ____ is used to convert frequency to cycles per sec.
120
What is the permeability of a substance that has field intensity of 60 Oe and a flux density of 105,000 G?
1750G/Oe
Max. out-of-phase condition occurs when a signals are ____ out of phase.
180
For a 2-pole generator, 1 cycle is generated for each ___ of mechanical rotation of the rotor.
360
What is the permeability of a substance that has field intensity of 5 Oe and a flux density of 35,000 G?
7000 G/Oe
____ broadcasting operates at 54 MHz to 216 MHz.
Frequency-modulated
____ measures the amount of density for magnetic lines of force.
Gauss
____ measures the magnetic strength per unit length of a conductor.
Intensity of magnetizing force
____ are electrical devices that use electromagnetism to change voltage from one level to another.
Transformer
A DC generator always has a rotating ____ and a stationary field.
armature
Electromagnetism is the magnetism produced when electricity passes through a ___.
conductor
A _____ substance is a substance with permeability less than 1 and is repelled by either pole of a magnet.
diamagnetic
A ____ is an electronic device that allows current to flow in only one direction
diode
___ current is current that flows in only one direction.
direct
A ____ substance is a substance that has permeability greater than 1 as well as greater than a paramagnetic substance.
ferromagnetic
For an eight- pole generator, ___ electrical degrees are produced for each mechanical degree of rotation.
four
field winding's are magnets are magnets used to produced the magnetic field in a ___.
generator
The ____ is the international unit of frequency to 1 cycle per second
hertz
The strength of a coils magnetic field is affected by all of the following factors except ___.
hysteresis loss
Rowlands law involves all of the following variables except
inductance
