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Cards In This Set
| Front | Back |
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A constant voltage source has a high internal resistance. (True or False)
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False
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Cells connected in series increase the output voltage. (True or False)
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True
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Cells are connected in parallel to increase the current capacity. (True or False)
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True
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A secondary cell can be recharged, but a primary cell cannot be recharged. (True or False)
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True
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The shelf life of most primary cells can be extended by storing them in a low-temperature environment. (True or False)
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True
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The internal resistance, ri, of a generator can be measured directly by connecting an ohmmeter across the output of the generator. (True or False)
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False
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For the lead-acid wet cell, lower temperatures reduce the current capacity and voltage output. (True or False)
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True
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When RL=ri, the efficiency of power transfer from generator to load equals 100%. (True or False)
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False
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The XC of a capacitor decreases as the frequency increases. (True or False)
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True
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The total XC of a capacitive reactances in series equals the sum of the individual values, as for series resistances. (True or False)
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True
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At the same frequency, a larger capacitance has more XC. (True or False)
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False
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Two 500 Ohm XC values in parallel have a combined reactance of 250 Ohm. (True or False)
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True
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Two 1 kOhm XC values in series have a total reactance of 1.414 kOhm. (True or False)
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False
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Capacitors have zero capacitive reactance for direct current. (True or False)
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False
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Capacitors block direct current. (True or False)
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True
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