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38 Cards in this Set
- Front
- Back
What is a solid-state device? |
An electronic device that operates by virtue of the movement of electrons within a solid piece of semiconductor material |
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Define the term negative temperature coefficient? |
The decrease in a semiconductors resistance as a temperature rises |
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Name three of the largest users of semiconductor devices? |
Space system, computers, and data process equipment |
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State one requirement of an electron tube, which does not exist for semi conductors, that makes the tube less efficient than the semiconductor? |
The electron tube requires filament or heater voltage, whereas the semiconductor device does not; consequently, no power input is spent by the semiconductor for conduction |
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Define matter and list it's three different states? |
Anything that occupies space and has weight, liquid, solid, gas. |
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What is the smallest particle into which an element can be broken down and still retain all its original properties? |
The atom |
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What are the three particles that comprise an atom and state the type of charge they hold? |
Electrons-negative, protons-positive, neutrons-neutral. |
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What is the outer shell of an atom called? |
Valence shell |
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What term is described the definite discrete amounts of energy required to move an electron from a low shell to a higher shell? |
Quanta |
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What is negative ion? |
A negatively charged atom having more than its normal amount of electrons |
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What is the main difference in the energy arrangement between an isolated atom and the atom in a solid? |
The energy levels of an atom in a solid group together to form energy bands, whereas the isolated atom does not |
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What determines, in terms of energy bands, whether a substance is a good insulator, semiconductor, or conducter? |
The width of the forbidden band |
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What determines the chemical activity of an atom? |
The number of electrons in the valence shell |
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What is the term used to described the sharing of valence electrons between two or more atoms? |
Covalent bonding |
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Name the two type of current flow in a semiconductor? |
Electron flow ad hole flow |
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What is the name given to a piece of pure semiconductor material that has an equal number of electrons and holes? |
Intrinsic |
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What is the name given to a doped germanium crystal with an excess of free holes? |
P-type crystal |
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What are the majority carriers in an N-type semiconductor? |
Electrons |
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What is the purpose of a PNA junction diode? |
To convert AC to DC |
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In reference to the schematic symbol for a diode, do electrons flow toward or away from the arrow? |
Towards |
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What type of PN diode is formed by using a fine metal wire section of N-type semiconductor material? |
Point-contact |
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What are the majority carriers in a P-type semiconductors? |
Holes |
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Conduction in which type of semiconductor material is similar to conduction in a copper wire? |
N-type material |
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In order to reverse bias in a PN junction, what terminal of a battery is connected to the P material? |
Negative |
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What is the name of the area in a PN junction that has a shortage of electrons and holes? |
Depletion region |
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What type of bias opposes the PN junction barrier? |
Forward |
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What is a load? |
Any device that draws current |
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What is the output of a half-wave rectifier? |
A pulsating DC voltage |
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What type of rectifier is constructed by sandwiching a section of semiconductor material between two metal plates? |
Metallic rectifier |
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What type of bias makes a diode act as closed switch? |
Forward bias |
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What is to show how diode parameters vary over a full operating range? |
A characteristic curve |
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What is meant by diode ratings? |
They are the limiting values of operating conditions outside which operations could cause diode damage |
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What does the letter N indicates in the semiconductor identification system? |
A semiconductor |
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What type of diode has orange, blue, and gray bands? |
IN368 |
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What type is the greatest threat to a diode? |
Heat |
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When checking a diode with an ohmmeter, what is indicated by two high resistance measurements? |
The diode is open or has a high-forward resistance |
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When applying 24 volts to A PN junction, you discover a large amount of resistance on the other side, what is this referred to as |
Reverse bias |
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What converts AC voltage to DC voltage in an alternator |
Diodes, they rectify the current |