| 1. |
The term negative temperature coefficient is just another way of saying its resistance to electrical current flow decreases as temperature increases. |
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True |
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False |
| 2. |
Selenium has a property to convert dc into ac.
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True |
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False |
| 3. |
Maximum _____________is the maximum current permitted to flow in the forward direction in the form of nonrecurring pulses. |
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Surge current |
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Forward current |
| 4. |
__________ bonding is the sharing of valence electrons between two or more atoms. |
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Covalent |
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Ionic |
| 5. |
Current flow in an N-type material is similar to conduction in a copper wire. |
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True |
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False |
| 6. |
A _______________ is a chemical combination of two or more elements. |
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Molecule |
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Atom |
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Compound |
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None of the above |
| 7. |
_____________is an external voltage that is applied to a PN junction to reduce its barrier and, therefore, aid current flow through the junction. |
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Reverse bias |
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Forward bias |
| 8. |
Diode ratings are not the limiting value of operating conditions of a diode. |
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True |
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False |
| 9. |
A ________is a three or more element solid-state device that amplifies by controlling the flow of current carriers through its semiconductor materials. |
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Diode |
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Rectifier |
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Transistor |
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None of the above |
| 10. |
The proper biasing of a transistor enables the transistor to be used as an amplifier. |
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True |
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False |
| 11. |
The_______________________ is mainly used for impedance matching, since it has a low input resistance and a high output resistance.. |
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Common emitter configuration |
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Common ground configuration |
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Common base configuration |
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None of the above |
| 12. |
The current gains for the three transistor configurations (CB, CE, and CC) are alpha, beta and gamma. |
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True |
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False |
| 13. |
The______________ is a three-terminal, solid-state device with only one PN junction.
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Uni-junction transistor |
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Mosfet |
| 14. |
The SILICON CONTROLLED RECTIFIER (SCR) is a four-element, solid-state device that does not combine characteristics of both diodes and transistors. |
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True |
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False |
| 15. |
The _________diode is a heavily doped PN junction that exhibits negative resistance over part of its range of operation.
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Zener |
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Tunnel |
| 16. |
HALF-WAVE rectifiers give an output on only one half cycle of the input ac.
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True |
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False |
| 17. |
Bridge rectifiers are full-wave rectifiers that do not use a center-tapped, high-voltage secondary. |
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True |
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False |
| 18. |
Inductor filters does not use an inductor called a choke to filter the pulsating dc input. Because of the impedance offered to circuit current, the output of the filter is at lower amplitude than the input. |
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True |
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False |
| 19. |
______________________ uses a variable resistance placed in parallel with the load. |
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Series regulator |
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Shunt regulator |
| 20. |
A positive electrode of an electrochemical device (such as a primary or secondary electric cell) toward which the negative ions are drawn is a _____________________. |
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Cathode |
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Anode |
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