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Subelement E
Power Sources:
Section 37
Batteries:
What is the normal voltage of a single NICAD battery cell?
  • Correct Answer
    1.2 volts
  • 1.5 volts
  • 2.1 volts
  • 2.5 volts
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What is the effect of temperature on the specific gravity of lead acid batteries?
  • Higher temperature results in a higher specific gravity reading.
  • Correct Answer
    Higher temperature results in a lower specific gravity reading.
  • Temperature has no effect on the specific gravity reading.
  • Lower temperature results in a lower specific gravity reading.
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What will cause an individual battery cell to reverse polarity?
  • The charging circuits are connected in the correct polarity but all of the cells are equally charged.
  • High discharge rates without allowing for a cool down period.
  • Correct Answer
    When discharging the battery — if a cell becomes weaker then the remaining cells the discharge current will effectively charge the weaker cell in reverse polarity.
  • Insufficient charging which does not bring all of the cells up to full charge.
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What is the normal specific gravity of a fully charged lead acid battery cell? What device is used to measuring the electrolyte of a lead acid battery?
  • 1.375 Voltmeter
  • 1.180 Voltmeter
  • 1.210 Hydrometer
  • Correct Answer
    1.280 Hydrometer
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What is a gel cell battery and how is it maintained & cared for?
  • Correct Answer
    Gel cell batteries are typically sealed — special charging rates and voltages may be required.
  • Gel cell batteries are lead acid with a solid electrolyte — each cell is checked with a voltmeter.
  • Gel cell batteries are NICAD with a solid electrolyte — each cell is checked with a voltmeter.
  • Gel cell batteries are have special liquid electrolytes — they are charged with the NICAD charging rates and voltages.
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What is the normal voltage of a single lead acid battery cell?
  • 1.5 volts
  • Correct Answer
    2.1 volts
  • 2.5 volts
  • 2.8 volts
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