7-A-099: Batteries
7-99J1:
What is the normal voltage of a single lead acid battery cell?
2.1 volts
1.5 volts
2.5 volts
1.2 volts
7-99J2:
What is the normal specific gravity of a fully charged lead acid battery cell?
1.280 Hydrometer
1.375 Voltmeter
1.180 Voltmeter
1.210 Hydrometer
7-99J3:
What is a gel cell battery and how is it maintained and cared for?
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 NICARD 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.
7-99J4:
What will cause an individual battery cell to reverse polarity.
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.
High discharge rates without allowing for a cool down period.
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.
7-99J5:
What is the effect of temperature on the specific gravity of lead acid batteries?
Higher temperature results in a lower specific gravity reading.
Higher temperature results in a higher specific gravity reading.
Temperature has no effect on the specific gravity reading.
Lower temperature results in a lower specific gravity reading.
7-99J6:
What would be an indication of a malfunction on a GMDSS station with a 24 VDC battery system?
A constant 30 volt reading on the GMDSS console voltmeter.
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.
After testing the station on battery power, the ammeter reading indicates a high rate of charge that then declines.
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