-
________ is the best conductor, its cost limits its use to special circuits.
Silver
-
______ is used where a substance with high conductivity or low resistivity is needed
-
-
The two most commonly used conductors are _______ and ______
copper, aluminum
-
______ has a higher conductivity than aluminum
copper
-
_______ 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
60 degree
-
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.
60, 40
-
THe most common type of solder is ___ % tin and ___ % lead
63, 37
-
63/37 solder has a melting point of ____F.
361
-
The melting point of 60/40 solder is _____ F.
370
-
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
C
-
______ is the faithful reproduction of a signal.
Fidelity
-
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 ___________
BREAKDOWN VOLTAGE
-
The LED operating voltage is small, about ___ volts forward bias and generally about 10 milliamperes
1.6,
-
The life expectancy of the LED is very long, over ______ hours of operation.
100,000
-
Transistors are semiconductor devices with ______or more terminals.
three
-
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
5
-
The ________which is the time (T) in which one complete vibratory cycle of events occurs,
PERIOD
-
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 ______
Sonics
-
The normal hearing range extends from about _____ to ______hertz
20, 20000
-
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
PITCH
-
The speed of sound is ____ feet per second.
1087/1100
-
The speed of light is ______ miles per second.
186,000
-
The frequencies falling between ________ and ___________are called RADIO FREQUENCIES (abbreviated rf) since they are commonly used in radio communications.
-
3000 hertz (3 kHz), 300,000,000,000 hertz (300 GHz)
-
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
ionosphere
-
____________ 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.
Natural
-
Hertz antennas are generally used for frequencies above ___ megahertz
2
-
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
1/2
-
The basic Marconi antenna is ___ wavelength long and is either grounded at one end or connected to a network of wires called a COUNTERPOISE.
1/4
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