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40 Cards in this Set
- Front
- Back
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WHAT DOES AMPERE-HOUR MEAN?
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A UNIT OF MEASURE THAT REFERS TO THE ELECTRICAL CAPACITY OF A BATTERY.
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WHAT IS THE EQUATION FOR AMPERE-HOUR?
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IT IS THE PRODUCT OF THE CURRENT IN AMPERES MULTIPLIED BY THE PERIOD OF TIME IN HOURS BY WHICH THE CURRENT IS DELIVERED.
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WHAT IS CUTOFF VOLTAGE?
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THE VOLTAGE POINT ON THE DISCHARGE CURE, FOR A SPECIFIED DISCHARGE RATE, AT WHICH THE BATTERY OR CELL IS CONSIDERED TO BE DISCHARGED FOR ALL PRACTICAL PURPOSES.
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WHAT IS CAPACITY RATE (C-RATE)?
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THE CAPACITY RATING OF LEAD-ACID AIRCRAFT STORAGE BATTERIES IS BASED ON A 1-HOUR DISCHARGE RATE WITH A STARTING TEMPERATURE OF 77 DEGREE F +- 7.5 DEGREE F AND A CUTOFF TERMINAL VOLTAGE OF 18 VOLTS FOR A 24-VOLT BATTERY.
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WHAT IS THE NOMENCLATURE FOR THE SLAB BATTERY?
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D8565
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WHAT IS THE RANGE OF A CELL'S OPEN-CIRCUT VOLTAGE?
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BETWEEN 2.1 AND 2.2 VOLTS
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UNDER NO CIRCUMSTANCES SHOULD A SLAB BE LEFT DISCHARGED FOR MORE THAN ____ HOURS
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24
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WHAT KIND OF ELECTROLYTE IS USED IN A SLAB?
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A DILUTE MIXTURE OF SULFURIC ACID AND WATER
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CAN THE SPECIFIC GRAVITY OF THE ELECTROLYTE BE MEASURED IN A SLAB?
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NO
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What happens when a battery reaches a full state of charge?
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The voltage of the battery will stabilize and remain constant or decrease.
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What is the open circuit value assigned to a lead-acid cell?
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2.10 volts
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What is the "knee"?
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The point of discharge near exhaustion when the voltage begins to drop sharply.
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Battery/cell voltage drops much more higher at __________ discharge rates?
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higher
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What does discharging a battery before charging prevent?
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overcharging
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What method of charging consist of all batteries in a circuit receiving the same amount of charge?
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Constant current charge method
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What kind of equipment shall not be used to maintain SLABs?
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Manual equipment
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What kind of batteries shall not be maintained, serviced, or stored in the same shop?
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Vented batteries with acid electrolytes and vented batteries with alkaline electrolyte.
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What do you use to neutralize tools of any potassium hydroxide contamination?
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rinse in potable water and then immerse them in a solution of one quart of distilled white vinegar mixed in 1 gallon of water.
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What is used as an acid neutralizing agent?
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6.0 ounces of sodium bicarbonate dissolved in 1.0 gallon of potable water.
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How long shall battery records be kept?
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Four years or until end of battery service life.
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Can a lead acid battery that has been installed in SE be put in an A/C?
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No
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What might you have to do to a battery to make the thermoswitches close?
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Cool it
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What is the limit that a lead acid battery can remain in discharge condition?
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24 hours
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In a vented lead acid storage battery, where is the lead located?
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in the negative plates
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In a vented lead acid storage battery, where is the lead dioxide/peroxide?
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In the positive plates
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In a vented lead acid storage battery, where is the Sulfuric acid?
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The electrolyte
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In a vented lead acid storage battery, where is the distilled water?
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in the electrolyte
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What is used to separate the negative and positive plates?
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Separators made of microporous polyethylene material.
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How many cells does a 12 volt battery have?
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6 cells in series
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How many cells does a 24 volt battery have?
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12 cells in series
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What is the specific gravity of sulfuric acid?
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1.835
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What is the range of the specific gravity of electrolyte used in aircraft batteries?
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1.275-1.295
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What is used to determine the specific gravity of electrolyte.
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A hydrometer
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What is a measure of the state-of-charge of the lead acid battery?
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The specific gravity reading
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What will make the electrolyte look dark and murky?
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Lead oxide material that has broken loose from the sediment wall or by the chemical reaction as a result of the battery being charged.
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Is a hydrometer reading taken immediately after battery water has been added to a battery cell reliable?
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No, it has to be mixed by charging the battery.
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What shall the electrolyte of a fully charged battery never be greater than?
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1,300
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Where is the correct electrolyte level in relation to the protective plates?
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3/8th inch above
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What are the factors in selecting a higher specific gravity?
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More capacity, shorter life, less space required, higher momentary discharge rate, less adaptable to floating charge, and more standing loss.
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What are the factors in selecting a lower specific gravity?
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Less capacity, longer life, more space required, lower momentary discharge rate, more adaptable to floating charge, and less standing loss.
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