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130 Cells and batteries
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Refer to the text in this chapter if necessary. A good score is 18 correct. Answers are in the back of the book. 1. The chemical energy in a battery or cell: A. Is a form of kinetic energy. B. Cannot be replenished once it is gone. C. Changes to kinetic energy when the cell is used. D. Is caused by electric current. 2. A cell that cannot be recharged is: B. A wet cell. C. A primary cell. D. A secondary cell. A. A dry cell.
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4. The voltage in a battery is: A. Less than the voltage in a cell of the same kind. B. The same as the voltage in a cell of the same kind. C. More than the voltage in a cell of the same kind. D. Always a multiple of 1.018 V. 5. A direct short-circuit of a battery can cause: A. An increase in its voltage. B. No harm other than a rapid discharge of its energy. C. The current to drop to zero. D. An explosion. 6. A cell of 1.5 V supplies 100 mA for seven hours and twenty minutes, and then it is replaced. It has supplied: A. 7.33 Ah. B. 733 mAh. C. 7.33 Wh. D. 733 mWh.
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3. A Weston cell is generally used: A. As a current reference source. B. As a voltage reference source. C. As a power reference source. D. As an energy reference source.
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Quiz 131 7. A 12-V auto battery is rated at 36 Ah. If a 100-W, 12-Vdc bulb is connected across this battery, about how long will the bulb stay lit, if the battery has been fully charged A. 4 hours and 20 minutes. B. 432 hours. C. 3.6 hours. D. 21.6 minutes. 8. Alkaline cells: A. Are cheaper than zinc-carbon cells. B. Are generally better in radios than zinc-carbon cells. C. Have higher voltages than zinc-carbon cells. D. Have shorter shelf lives than zinc-carbon cells. 9. The energy in a cell or battery depends mainly on: A. Its physical size. B. The current drawn from it. C. Its voltage. D. All of the above. 10. In which of the following places would a lantern battery most likely be found A. A heart pacemaker. B. An electronic calculator. C. An LCD wall clock. D. A two-way portable radio. 11. In which of the following places would a transistor battery be the best power-source choice A. A heart pacemaker. B. An electronic calculator. C. An LCD wristwatch. D. A two-way portable radio. 12. In which of the following places would you most likely choose a lithium battery A. A microcomputer memory backup. B. A two-way portable radio. C. A portable audio cassette player. D. A rechargeable flashlight. 13. Where would you most likely find a lead-acid battery A. In a portable audio cassette player.
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132 Cells and batteries B. In a portable video camera/recorder. C. In an LCD wall clock. D. In a flashlight. 14. A cell or battery that keeps up a constant current-delivering capability almost until it dies is said to have: A. A large ampere-hour rating. B. Excellent energy capacity. C. A flat discharge curve. D. Good energy storage per unit volume. 15. Where might you find a NICAD battery A. B. C. D. In a satellite. In a portable cassette player. In a handheld radio transceiver. In more than one of the above.
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16. A disadvantage of mercury cells and batteries is that: A. They don t last as long as other types. B. They have a flat discharge curve. C. They pollute the environment. D. They need to be recharged often. 17. Which kind of battery should never be used until it dies A. Silver-oxide. B. Lead-acid. C. Nickel-cadmium. D. Mercury. 18. The current from a solar panel is increased by: A. Connecting solar cells in series. B. Using NICAD cells in series with the solar cells. C. Connecting solar cells in parallel. D. Using lead-acid cells in series with the solar cells. 19. An interactive solar power system: A. Allows a homeowner to sell power to the utility. B. Lets the batteries recharge at night. C. Powers lights but not electronic devices. D. Is totally independent from the utility.
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Quiz 133 20. One reason why it is impractical to make an extrememly high-voltage battery of cells is that: A. There s a danger of electric shock. B. It is impossible to get more than 103.5 V with electrochemical cells. C. The battery would weigh to much. D. There isn t any real need for such thing.