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Subel. J
6 questions
Subelement J

MF-HF Equip. and Comms:

Section 99

Batteries

What is the normal voltage of a fully charged single lead acid battery cell?

  • 1.5 volts
  • 2.5 volts
  • Correct Answer
    2.1 volts
  • 1.2 volts

Generally, the lead acid battery has about 2.1 volts.

Electricity can be described as volts, ampers, and ohms.

Volts really measure the difference between the pressure on electrons of two items.
Ampers measure the flow of electrons on the surface of materials due to pressure of volts.
Ohms measure a flow constrictor of the electrons, kind of a speed bump.

What is more likely is that what actually flows is the pressure energy, like on water, where water of the waves does not actually move, but the waves flow through water as energy.

Voltage Info from Battery University site

Last edited by markadlerdallas. Register to edit

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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
    1.265 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 will cause an individual battery cell to reverse polarity.

  • High discharge rates without allowing for a cool down period.
  • Correct Answer
    When discharging the battery string if a cell becomes weaker than 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.
  • The charging circuits are connected in the correct polarity but all of the cells are equally charged.
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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 would be an indication of a malfunction on a GMDSS station with a 24 VDC battery system?

  • All of these symptoms would indicate a potential battery charger malfunction.
  • After testing the station on battery power, a voltmeter reading of 30 volts for a brief period followed by a steady 26 volt reading.
  • Correct Answer
    A constant 30 volt reading on the GMDSS console voltmeter.
  • After testing the station on battery power, the ammeter reading indicates a high rate of charge that then declines.
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