Term
| What is the name given to the outermost shell of an atom? |
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Definition
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Term
| Current flow in a copper wire can be compared to current flow in what type of semi conductor material? |
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Definition
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Term
| What determines wether a material is an insulator, conductor, or semiconductor? |
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Definition
| The seperation between the conduction and valence bands |
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Term
| A perfect junction at the bound of two diode materials is important for what reason? |
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Definition
| It is the point at which rectification takes place |
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Term
| What electronic device is a minute piece of semiconductor material that can produce complete electronic circuit functions? |
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Definition
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Term
| What is the MOST valid test for checking a diode? |
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Definition
| A dynamic electrical check with a diode test set |
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Term
| What provides you with information concerning the voltage-current relationship of a PN junction diode? |
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Definition
| The characteristic curve graph of the diode |
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Term
| The alphanumeric code "CR3" identifies what diode in a circuit? |
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Definition
| Crystal Rectifier number 3 |
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Term
| A material that has an equal number of electron hole pairs and conducting electrons is known as what type of semi conductor material? |
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Definition
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Term
| After the junction recombination process has reached equilibrium, what is the area that surrounds the juntion called? |
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Definition
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Term
| What term is used to describe an atom that has more than its normal amount of electrons? |
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Definition
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Term
| In a PN junction, what action will increase the number of majority carriers and increase current flow in a forward biased condition? |
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Definition
| Increasing battery voltage |
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Term
| What is the overall electrical charge of the N-type material in a semiconductor? |
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Definition
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Term
| When the theory of semiconductors is discussed, what term is used to describe the current that flows throught the semiconductor? |
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Definition
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Term
| What electronic devices operate by virtue of movement of electrons within a solid piece of semiconductor material? |
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Definition
| Transistor, Junction diode, solid state device |
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Term
| What device is frequently used to regulate power supply voltages at precise levels? |
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Definition
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Term
| When the negative terminal of a battery is being connected to the P material, and the positive terminal is being connected to the N material, what type of bias is being used? |
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Definition
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Term
| If the input frequency of a half wave rectifier is 120Hz, what is the output frequency of the output DC? |
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Definition
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Term
| In a schematic diagram of a PN junction diode, what symbol represents the cathode? (N-type material) |
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Definition
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Term
| What term is used to describe the decrease in resistance as the temperature of the semiconductor increases? |
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Definition
| Negative temperatur coefficient |
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Term
| When doping increases the number of free electrons in a semiconductor, what type of impurity has been added? |
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Definition
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Term
| One of the prime dangers to the semiconductor diode is heat. When excessive current generated by heat eventually destroys a diode is called what? |
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Definition
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Term
| In a forward biased PN junction, when an electron leaves the negative terminal of the battery and enters the N material, it becomes what type of carrier? |
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Definition
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Term
| What is the purpose of the PN junction diode? |
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Definition
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Term
| What is normally the power ratio of a power rectifier? A signal diode? |
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Definition
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Term
| What is the overall electical charge of the P-type material in a semiconductor? |
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Definition
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Term
| What term applies to the process that holds the atom together in crystal? |
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Definition
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Term
| A voltage applied to a PN juntion so that it reduces the junction barrier and aids in the current flow is what type of bias? |
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Definition
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Term
| As you make a front to back ratio check of the diode with an ohmeter, your first measurement (Forward) is a low reading, and your second measurement (reverse) is also a low reading. What should be your evaluation of the diode? |
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Definition
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Term
| Elecrons are NEVER found in which band of an atom? |
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Definition
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Term
| In a P-type semiconductor, what are the majority carriers? |
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Definition
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Term
| What solid state device has both gain and fast-switching capabilities? |
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Definition
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Term
| One of the most sensitive elements of semiconductor materials is galena. Galena is a crystalline form of what material? |
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Definition
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Term
| A standard specification sheet for a diode contains what information? |
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Definition
| A brief description of the diode, major application of the diode, special features of the diode (all of the above) |
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Term
| What advantages, if any, does a conventional electron tube have over a semiconductor device? |
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Definition
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Term
| A voltage applied to the PN junction so that it will increase the junction barrier and offer a high resistance to current flow is called what type of bias? |
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Definition
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Term
| The movement of electrons in a semiconductor toward the applied voltage is termed? |
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Definition
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Term
| A perfect bond at the junction of two diode materials is important for what reason? |
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Definition
| It is the point at which rectification takes place |
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Term
| What causes the process called junction recombination to occur when N and P materials are joined together? |
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Definition
| The diffusion of electrons and holes moving across the junction into the two materials |
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Term
| What type of rectifier replaces the bulky selenium rectifier? |
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Definition
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Term
| The process of adding impurities to crystals is known by what term? |
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Definition
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Term
| What type of bias makes the diode act as an open switch? |
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Definition
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Term
| When compared to an electron tube, the semiconductor device has what limitation? |
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Definition
| The semiconductor is more sensitive to temperature |
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Term
| The placing of an impurity on a semiconductor of the opposite impurity and fusing the two together produce what type of semiconductor junction? |
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Definition
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Term
| Signal diodes are used for what purpose? |
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Definition
| Mixers, switches, and detectors (each of the above) |
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Term
| When replacing a diode in a circuit, what safety precautions should you observe when removing the diode from the circuit? |
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Definition
| Do not pry the diode from the circuit, do not use excessive heat to remove the diode, do not remove the diode from the circuit while voltage is applied (all of the above) |
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Term
| The semiconductor doping impurities: aresnic, antimony, and bismuth, are classified as what type of impurities? |
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Definition
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Term
| In addition to rectifying properties, selenium has the property of being light sensitive. How is selenium's reistance affected by light? |
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Definition
| It decreases with an increase in light intensity |
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Term
| What significant discovery cause a break through in the development of semiconductor devices? |
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Definition
| The point-contact transistor |
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Term
| Why are the units (plates) of the metallic rectifier stacked? |
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Definition
| To prevent inverse voltage breakdown |
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Term
| What process takes place within the semiconductor to cause hole flow? |
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Definition
| The breaking of covalent bonds |
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