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