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Negative plate consist of what?
sponge lead
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Positive plate consist of what?
lead peroxide
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Purpose of the vent plug?
prevent splashes, allow gas to escape, one-way valve.
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Specific Gravity formula.
weight of certain volume / same volume of water.
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Specific Gravity of water.
1
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Specific Gravity of sulfuric acid.
1.83
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S.P. of mixture of sulfuric acid and water.
1 - 1.83
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S.P. of electrolyte in lead-acid battery.
1.350 or less
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S.P. of electrolyte in standard battery.
1.210 - 1.220
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S.P. of electrolyte in new batteries.
1.400 - 1.830
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Electrolyte in fully charged batteries.
38% sulfuric acid by weight27% by volume
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What happens of battery is discharged?
sulfuric acid depleted, electrolyte turns to water.
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Two types of hydrometer
Type A - for submarinesType B - portable storage and aircraft. Scale: 1.100 - 1.300
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Is specific gravity is affected by temperature?
yes
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what happens when electrolyte is heated?
it expands, less dense, and lower reading
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What happens when electrolyte is cooled?
it contracts, denser, and higher reading.
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What temperature is used to correct S.G?
80 degree F
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How to correct S.G.
add 1 point to the reading for each 3°F above 80°F subract 1 point to the reading for each 3°F below 80°F
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What can you do when it reaches 40°F and below
increase the S.G. to 1.280
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Never add acid with a S. G. above what?
1.35
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What can be used to stir electrolyte?
non metallic rod
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What type of electrolyte is authorized onboard.
premixed
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How is battery capacity measured?
ampere-hours
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How to calculate ampere-hour capacity.
current in amperes (times) time in hours
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Ampere-hour capacity depends on what?
size of the cell
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How is bettery rating determined?
by rate of discharge and ampere-hour capacity.
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How are most bettery rated?
according to a one 10-hour rate of discharge.
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If a fully charged battery is completely discharged during a 10-hour period, It is discharge at what rate?
10-hour rate
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Battery can deliver 20 amperes for 10 hours, what'sthe rating?
200 ampere-hours
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Whats a low-voltage limit?
which very little useful energy can be obtained from battery
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What happens to a batt when discharged
dropped to 150 pts, 1.75 per cell, electrolyte 1.060, acid decreases.
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What happens to a batt when charged?
2.4 -2.6 volts per cell
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70 a/h at 10-hour rate, what is the drop in S.G.
105 pts (70 x 1.5) or 40 a/h (60/1.5)
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What are the types of battery charges?
1. Initial, normal, equalizing, floating, and emergency charge
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What is an initial charge use for?
new battery, plates uncharged, and use long-low initial charge.
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What is a normal charge?
complete S.G. is within 5 pts or .005 of equalizing charge. Check S.G. hourly, use nameplate data for start/finish rate.
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What is an equalizing charge?
an extended normal charge at the finishing rate, read every half hour, continue until S.G. shows no change for 4 hour.
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What is an emergency charge?
use for the shortest possible time with higher rate than normal,
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Where is the battery charging rate found?
Where is the battery charging rate found?
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When to test discharge a battery?
after 4 years, S.G. not within 10 pts, low output, and cells are less than normal voltage.
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Capactiy formula
C=Ha/Ht X 100: Ha - hours discharge, Ht-
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What can be use to treat acid burns?
water, petroleum, boric, zinc or lube oil.
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Discription of 24-302-BN batter charger
115VAC + or - 5%, 60Hz + or - 5%, 1 phase, 20 a
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What are the only moving parts of the charger?
adjustable resistors, rheostats, and meters
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