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Comms > A to C > Flashcards

A to C Flashcards

0
Q

Dissipation of radio or sound waves as they interact with matter.
The absorbing of light waves without reflection or refraction.

A

absorption

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1
Q

The ability of the magnetic tape to wear the head

A

abrasivity

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2
Q

the amount of time between the time a request is made from a storage device is made and the time the data is delivered.

A

access Time

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3
Q

Operational phase of a fire-control mechanism during which the radar system searches a small volume of space in a prearranged pattern.

A

Acquisition

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4
Q

The part of a switch that is acted upon to cause the switch to change contact connections; for example, toggle, pushbutton, and rocker.

A

Actuator

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5
Q

Any material in the coating of a magnetic tape other than the oxide and binder resin.

A

Additive

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6
Q

The emitter-to-collector current gain in a common-base circuit

A

Alpha

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7
Q

The movement of Aluminum wire from a point where pressure is applied.
The retreat of heated aluminum wire as it cools.

A

Aluminum Creep

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8
Q

Echoes that exceed the prt of a radar and appear at incorrect ranges.

A

Ambiguous Returns

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9
Q

A special dc generator in which a small voltage applied to the field windings controls a large output voltage from the generator. In effect, it becomes a rotary amplifier that often times produces gains of approximately 10,000.

A

Amplidyne

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10
Q

The angular difference between the equatorial plane of the earth and the plane of orbit of the satellite.

A

Angle of inclination

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11
Q

The value of 1 angstrom.

A

1x10^-10

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12
Q

A positive electrode of an electrochemical device toward which the negative ions are drawn.

A

Anode

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13
Q

A device used for impedance matching between an antenna and a transmitter or receiver.

A

Antenna Coupler

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14
Q

An electronic circuit used to minimize the effects of enemy countermeasures thereby permitting radar echoes to be visible on the indicator.

A

Anti-Jamming Circuit

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15
Q

The effect of the earth’s rotation on a gyro that causes the spinning axis to appear to make one complete rotation in one day. AKA APPARENT PRECESSION or APPARENT ROTATION.

A

Apparent Drift

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16
Q

The power apparently available for use in an ac circuit containing a reactive element. it is the product of effective voltage times effective current expressed in volt-amperes. It must be multiplied by the power factor to obtain true power available

A

Apparent Power

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17
Q

The part of a circuit breaker that confines and divides the arc which occurs when the contact of the circuit breaker opens.

A

Arc Extinguisher

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18
Q

Copper losses, eddy current losses, and hysteresis losses that act to decrease the efficiency of armatures.

A

Armature Losses

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19
Q

An LC network that is designed to simulate the characteristics of a transmission line.

A

Artificial Transmission Line

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20
Q

A computer program that translates source programs written in assembly language into machine language (object) programs.

A

Assembler

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21
Q

A low-level, machine oriented programming language in which each instruction (written as a mnemonic) translates into a single machine language (computer) instruction.

A

Assembly language

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22
Q

A multivibrator that has no stable state. Also called free-running because it alternates between two different output voltage levels during the time that it is on. The frequency is determined by the RC time constant of the coupling circuit.

A

Astable Multivibrator

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23
Q

A multivibrator that generates rectangular waves.

A

Asymmetrical Multivibrator

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24
Q

The ability of a filter circuit to make reduce the amplitude of unwanted frequencies to a level below that of the desired frequency.

A

Attenuation

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25
Q

Tracking done by equipment that compares the direction of the antenna axis and the direction of the received signal and uses the difference (error) signal to reposition the antenna.

A

Automatic Tracking

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26
Q

The peripheral equipment or devices that may or may not be in direct communication with the central processing unit of a computer.

A

Auxiliary Equipment

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27
Q

A reverse breakdown effect in diodes that occurs at reverse voltages beyond 5 volts. The released electrons are accelerated by the electric field, which results in a release of more electrons in a chain.

A

Avalanche Effect

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28
Q

Angular measurement in the horizontal plane in a clockwise direction

A

Azimuth

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29
Q

The larger resistance value observed when you are checking the resistance of a semiconductor.

A

Back Resistance

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30
Q

A waveguide arrangement that resembles a T and uses crystals for coupling the output to a balanced transformer.

A

Balanced Mixer

AKA MAGIC T

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31
Q

The difference between the highest usable frequency of a device and the lowest usable frequency of the device - measured at the half-power points

A

Bandwidth

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32
Q

A measurement of speed based on the number of code elements or units per second

A

Baud

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33
Q

The ration of a change in collector current to a corresponding change in base current when the collector voltage is constant in a common-emitter circuit

A

Beta

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34
Q

The reference color of equipment that passes unclassified information. It normally refers to patch panels

A

Black

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35
Q

The current through a bleeder resistor. In a voltage divider, it is usually determined by the 10 PERCENT RULE OF THUMB.

A

Bleeder Current

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36
Q

a condition in an amplifier, caused by over driving one or more stages, in which the amplifier is insensitive to small signals immediately after reception of a large signal

A

Blocking

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37
Q

A loading device that undergoes changes in resistance as changes in dissipated power occur

A

Bolometer

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38
Q

The phenomenon occurring in a reverse-biased semiconductor diode. The start of the phenomenon is observed as a transition from a high dynamic resistance to one of substantially lower dynamic resistance. This is done to boost the reverse current.

A

Breakdown

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39
Q

The relative elongation of a specimen of magnetic tape of base film at the instant of breaking when it has been stretched at a given rate

A

Break elongation

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40
Q

The name given the potentiometer used to vary the potential applied to the control grid of a CRT

A

Brightness Controll

41
Q

Sliding contacts, usually carbon, that make electrical connection the rotating part of a motor or generator

A

Brushes

42
Q

A voltage amplifier used between the oscillator and power amplifier

A

Buffer

43
Q

An amplifier that isolates one circtui from another. It decreases the loading effect on an oscillator by reducing the interaction between the load and the oscillator

A

Buffer Amplifier

44
Q

A mistake in a program

A

BUG

45
Q

An equipment for erasing a full reel of previously recorded signals on tape

A

Bulk Eraser (Degausser)

46
Q

Tool used to clean and polish contacts on a relay

A

Burnishing Tool

47
Q

A heavy copper strap or bar used to connect several circuits together when a large current-carrying capacity is required

A

Bus Bar

48
Q

A device that measures rf power by measuring the heat the rf power generates

A

Calorimeter

49
Q

The property of an electrical circuit that opposes changes in voltage

A

Capacitance

50
Q

This filter is used on extremely high-voltage, low-current power supplies and also where the ripple frequency is not critical

A

Capacitor filter

51
Q

A microphone in which sound waves vary the resistance of a pile of carbon granules. May be single-button or double-button.

A

Carbon Microphone

52
Q

An electron tube that has an electron gun, a deflection system, and a screen. This tube is used to display visual electronic signals

A

Cathode-Ray Tube (CRT)

53
Q

A space totally enclosed by a metallic conductor and supplied with energy in such a way that it becomes a source of electromagnetic oscillations .The size and shape of the enclosure determines the resonant frequency.

A

Cavity Resonator

54
Q

A single unit that transforms chemical energy into electrical energy.

A

Cell

55
Q

Connecting the center of an antenna to a transmission line which is then connected to the final (output) stage of the transmitter

A

Center Feed Method

56
Q

A unit of volume of large rectangular or square conductors. The cross-sectional area equals 1 square centimeter with a length of 1 centimeter.

A

Centimeter Cube

57
Q

The part of the computer hardware that directs the sequence of operations, interprets the coded instructions.

A

Central Processing Unit (CPU)

58
Q

A letter, digit, or other symbol that is used as part of the organization, control, or representation of infromation

A

Character

59
Q

The ratio of voltage to current at any given point on a transmission line represented by a value of impedance

A

Characteristic impedance

60
Q

An inductor used to impede the flow of pulsating dc or ac by means of self-inductance.

A

Choke

61
Q

An area equal to that of a circle with a diameter of 0.001 inch. It is used for measuring the cross-sectional area of wires.

A

Circular Mil

62
Q

A circuit in which either the upper or lower extremity of a waveform is fixed at a desired value

A

Clamper

63
Q

The type of operation in which the amplifier is biased so that variation in input signal polarities occur tight the limits of cutoff and saturation

A

Class A Amplifier Operation

64
Q

The type of operation in which the amplifier is biased so that collector current is cutoff for a portion of the alternation of the input signal.

A

Class AB Amplifier operation

65
Q

The type of operation in which the amplifier is biased so that collector current cutoff for one-half of the input signal

A

Class B Amplifier Operation

66
Q

The type of operation in which the amplifier is biased so that collector current is cutoff fore more than one-half of the input signal

A

Class C Amplifier Operation

67
Q

Confusing, unwanted echoes that interfere with the observation of desired signals on a radar indicator

A

Clutter

68
Q

A high-level programming language designed for business-type applications

A

COBOL (COmmon Business Oriented Language)

69
Q

In teletypewriter operation, code is a combination of mark and space conditions representing symbols, figures, or letters.

A

CODE

70
Q

An inductive device made by looping turns of wire around a core.

A

Coil

71
Q

The element in a transistor that collects the current carriers

A

Collector

72
Q

A program that translates source programs written in a high-level programming language (COBOL or FORTRAN) into machine language

A

Compiler

73
Q

Cable in which the center conductor is separated from an outer conductor by a dielectric material; used in rf transmission

A

Coaxial Cable

74
Q

A mechanical device that reverses armature connections in motors and generators at the proper instant so that the current continues to flow in only one direction. In effect, the commutator changes ac to dc.

A

Commutator

75
Q

An equipment that compares incoming signals and selects the strongest to be fed to a teletypewriter through a patch panel. This is used in diversity operation.

A

Comparator

76
Q

A number or state that is the opposite of a specified number of states.

A

Complement

77
Q

Complementary (secondary) colors of light

A

Magenta, Yellow and Cyan.

78
Q

Longitudeinal (SOUND WAVES) waves that have been compressed more dense) as they move away from the scource

A

Compression Waves

79
Q

The ability of a material to conduct or carry an electric current. It is the reciprocal of the resistance of the material and is expressed in mhos or siemens

A

Conductance

80
Q

In radar, an object that reflects rf energy; target

A

contact

81
Q

In communications, equipment that changes the audio output of a receiver to dc pulses. These pulses are fed to a tty to indicate marks and spaces

A

Converter

82
Q

A mechanical magnetron tuning device that changes the frequency by changing the capacitance of the anode cavities

A

Cookie-cutter tuner

83
Q

A half-wave antenna with a reflector consisting of two flat metal surfaces meeting at an angle behind the radiator

A

Corner-reflector antenna

84
Q

Includes location and repair of equipment failures

A

Corrective maintaenance

85
Q

Coulomb’s law states that charged bodies attract or repel each other with a force that is directly proportional to the product of their individual charges and inversely proportional to the square of the distance between them.

A

Attraction

86
Q

A circuit that counts input pulses

A

Counter

87
Q

The voltage generated within a coil by a moving magnetic field cutting across the coil itself. This voltage is in position (counter) to the moving field that created it. Counter emf is present in every motor, generator, transformer, or other inductance winding whenever an alternating current flows.

A

Counter EMF

88
Q

A network of wire connected to a quarter-wave antenna at one end. The network provides the equivalent of an additional one-fourth wavelength.

A

Counterpoise

89
Q

The process of transferring energy from one point in a circuit to another point, or from one circuit to antoher

A

Coupling

90
Q

A capacitor used to couple signals

A

Coupling Capacitor

91
Q

A coupling coil that connects the transmitter to the feeder

A

Coupling Device

92
Q

A type of linkage between atoms in which the atoms share valence electrons

A

Covalent Bond

93
Q

The maximum angle at which radio waves can be transmitted and still be reflected back to earth

A

Critical Angle

94
Q

The maximum frequency at which a radio wave can be transmitted vertically and still be refracted back to earth

A

Critical Frequency

95
Q

A natural substance, such as quartz or tourmaline, that is capable of producing a voltage when under physical stress or of producing physical movement when a voltage is applied.

A

Crystal

96
Q

The safe current-carrying capacity of a wire or cable on a continuous basis

A

Current Rating

97
Q

A pointer (a dot of light) on a crt screen to let you know the next position in which data will be entered. By depressing cursor control keys, the operator can move the cursor from line to line and from character to character.

A

Cursor

98
Q

The condition in a tube or transistor whereby the reverse bias prevents current flow

A

Cutoff

99
Q

One complete positive and one complete negative alternation of a current or voltage.
A 360-degree rotation of vector generating a sine wave.

A

Cycle

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