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# Electronics Information Review for ASVAB Power Practice Problems (page 2)

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Updated on Aug 12, 2011

1. d.   A quartz crystal is typically found in an oscillator and uses the piezoelectric effect to create an electrical signal. This capability is commonly used to keep track of time (as in quartz wristwatches).
2. b.   A typical residential wall outlet in North America uses alternating current (AC) voltage.
3. b.   Radio waves have the longest wavelengths of the answers given.
4. a.   A step-down transformer would be required to reduce the voltage.
5. b.   This is the schematic symbol for a circuit breaker.
6. a.   One coulomb is the amount of electric charge transported in one second by a steady current of one ampere.
7. d.   A diode allows electrical current to flow through it in one direction. This unidirectional behavior is called rectification, making one of the functions performed by a diode a rectifier.
8. a.   A photovoltaic cell, or solar cell, takes the energy from solar radiation and produces direct current.
9. d.   Choice a represents a polarized two-plug wire, choice b represents the source of a constant current, and c represents a speaker.
10. a.   Low potential to electricians most closely means 600 watts or lower.
11. b.   When values are in decibels, the gains and losses in power are simply added together to determine the expected power level. –10 dBm – 2 dB + 30 dB – 3 dB + 20 dB – 5 dB = 30 dBm.
12. a.   Random access memory (RAM) chips are known as "volatile," which means the data contained is lost when power is turned off.
13. d.   The charge polarity of electrons is negative; the charge polarity of protons is positive.
14. c.   Remember that in a series circuit the sum of the individual resistors determines the total resistance: 10 + 55 = 65.
15. d.   The amplification factor (also called gain) is usually expressed in terms of power. The decibel (dB), a logarithmic unit, is the most common way of expressing the amplification factor.
16. d.   The prefix "micro" means multiply by 10–6, so 287 microamps equals 0.000287 A.
17. d.   A minimum of #4 wire gauge is required. The amount of power that is transmitted through the electrical line dictates how large the gauge wire should be. American wire gauge (AWG) standards have the largest wires gauge in the lower numbers.
18. c.   Cartridge fuses with a rating of 60 amps or higher will have knife-blade terminals on either end, as illustrated.