________ is the best conductor, its cost limits its use to special circuits.
______ is used where a substance with high conductivity or low resistivity is needed
The two most commonly used conductors are _______ and ______
______ has a higher conductivity than aluminum
_______ has only about 60 percent of the conductivity of copper, its lightness makes long spans possible
When stripping insulation from a conductor with a knife, the knife should be held at approximately a ___ angle to the conductor
Wires to be soldered to connectors should be stripped so that when the wire is placed in the barrel, there will be a gap of approximately___ inch between the end of the barrel and the end of the insulation
The solder used for terminal lugs, splices, and connectors is a mixture of ____-percent tin and ____-percent lead.
THe most common type of solder is ___ % tin and ___ % lead
63/37 solder has a melting point of ____F.
The melting point of 60/40 solder is _____ F.
Class __ amplifiers are biased so that variations in input signal polarities occur within the limits of CUTOFF and SATURATION.
Amplifiers designed for class ___ operation are biased so that collector current is zero (cutoff) for a portion of one alternation of the input signal.
Amplifiers biased so that collector current is cut off during one-half of the input signal are classified
In class __ operation, collector current flows for less than one half cycle of the input signal
______ is the faithful reproduction of a signal.
The ______ of an amplifier refers to the ratio of output-signal power compared to the total input power
_________________ is the most frequently used configuration in practical amplifier circuits, since it provides good voltage, current, and power gain.
COMMON-EMITTER CONFIGURATION (CE)
__________ is mainly used for impedance matching, since it has a low input resistance and a high output resistance.
COMMON-BASE CONFIGURATION (CB)
The ___________ is used as a current driver for impedance matching and is particularly useful in switching circuits.
COMMON-COLLECTOR CONFIGURATION (CC)
The voltage at which the sudden increase in current occurs is called the ___________
The LED operating voltage is small, about ___ volts forward bias and generally about 10 milliamperes
The life expectancy of the LED is very long, over ______ hours of operation.
Transistors are semiconductor devices with ______or more terminals.
A second type of field-effect transistor has been introduced in recent years that has some advantages
over the JFET. This device is the ______________.
metal oxide semiconductor field effect transistor (MOSFET).
The ZENER EFFECT explains the breakdown of diodes below __ volts
The ________which is the time (T) in which one complete vibratory cycle of events occurs,
The _________which is the distance the disturbance travels during one period of vibration
The ___________ is the apparent change in frequency or pitch when a sound source moves either toward or away from the listener, or when the listener moves either toward or away from the sound source
Sounds capable of being heard by the human ear are called ______
The normal hearing range extends from about _____ to ______hertz
The standard sonic range for the Navy is _____hertz at a upper limit and a lower limit at ___hertz
10,000 , 15
Sounds below ____ hertz are known as infrasonic (formerly referred to as subsonic) sounds
______ is used to describe the frequency of a sound
The speed of sound is ____ feet per second.
The speed of light is ______ miles per second.
The frequencies falling between ________ and ___________are called RADIO FREQUENCIES (abbreviated rf) since they are commonly used in radio communications.
The usable radio-frequency range is roughly _______ to _______.
10 kilohertz, 100 gigahertz
The _________ has a great effect on the propagation of radio waves.
The _________ allows radio waves to be propagated to great distances around the Earth
____________ interference refers to the static that you often hear when listening to a radio. This interference is generated by natural phenomena, such as thunderstorms, snowstorms, cosmic sources, and the sun.
Hertz antennas are generally used for frequencies above ___ megahertz
Marconi antennas are used for frequencies below ___ megahertz and may be used at higher frequencies in certain applications
The basic Hertz antenna is ____ wavelength long at the operating frequency and is insulated from ground
The basic Marconi antenna is ___ wavelength long and is either grounded at one end or connected to a network of wires called a COUNTERPOISE.