Lead and Nicad
The type of material used in making a cell determines?
Capacity
Voltage
Current
Size
The amount of active material used in making a cell determines?
Capacity
Cell Voltage
Type of battery
Battery voltage
A battery rated at 35 AH can deliver?
5A for 6 hours
6A for 6 hours
7A for 5 hours
70A for 2 hours
What happens to the internal resistance of a battery as it discharges?
Nothing, batteries don’t have internal resistance
Increases
Decreases
Remains constant
How long must a battery be able to provide emergency power to the aircraft?
30 minutes
45 minutes
60 minutes
90 minutes
How many cells are in a 24 volt lead acid battery?
24
12
6
20
What is the open cell voltage of a lead acid cell?
1.5 V
1.2 V
2.0 V
2.1 V
What are the active materials applied to the grids in a lead acid battery?
Spongy lead & lead peroxide
Spongy lead & antimony
Antimony & lead peroxide
Lead peroxide & sulfuric acid
What materials are used to construct the grid in a lead acid battery?
Lead & Tungsten
Lead & Uranium
Lead & Antimony
Lead & Zinc
What material is applied to the grid to form negative plates in a lead acid battery?
Lead peroxide
Antimony
Cadmium
Spongy lead
What material is applied to the grid to form positive plates in a lead acid battery?
Lead peroxide
Antimony
Nickel
Spongy lead
What electrolyte is used in lead acid batteries?
Boric acid
Potassium hydroxide
Sulfuric acid
Distilled water
What is produced in a lead acid battery during discharge?
Lead sulfate
Spongy lead
Lead peroxide
Sulfuric acid
What is produced in a lead acid battery during discharge?
Spongy lead
Water
Lead peroxide
Sulfuric acid
What happens when a lead acid battery is left in a discharged state for a prolonged period of time?
Plate materials convert to lead sulfate
Cell plates can warp
Lead sulfate hardens & battery becomes sulfated
Battery will hold its charge but requires a recharge before use
When servicing lead acid batteries, what precautions must be taken?
Wear PPE
Remove metal jewelry
Ensure neutralizing agent is available
All of the above
How is the state of charge of a lead acid battery determined?
Measure the voltage
Specific gravity
Check the paperwork
Capacity check
What is the definition of specific gravity?
Volume of electrolyte compared to the volume of water
Quantity of electrolyte in the cell
Density of electrolyte compared to the density of water
Open circuit voltage compared to closed circuit voltage of a cell
What is used to measure the specific gravity of a lead acid battery cell?
Thermometer
Anemometer
Hydrometer
Barometer
What happens to the specific gravity of a lead acid cell during discharge?
Drops to zero
Increases
Remains constant
Decreases
What happens to the specific gravity of a lead acid cell during charging?
Drops to zero
Decreases
Remains constant
Increases
What is the specific gravity of a fully charged lead acid cell?
2.1
3.1
1.275-1.300
5.8
What is the open circuit voltage of a 12V lead acid battery?
2.1 V
12 V
12.6 V
14 V
During servicing of a lead acid battery you notice that it has a low electrolyte level. What should you add to the battery to top up the electrolyte level?
Distilled water
Sulphuric acid
Tap water
Boric acid
What are the active materials used in the construction of a NiCad battery?
Lead & Cadmium
Nickel & Hydroxide
Nickel & Cadmium
Nickel & Lead
What is the specific gravity of a fully charged NiCad cell?
1.50
1.24-1.32
2.30
1.275-1.300
What electrolyte is used in NiCad batteries?
Potassium hydroxide
Sulfuric acid
Boric acid
Sodium bicarbonate
What happens to the specific gravity of a NiCad cell during discharge?
Drops to zero
Remains constant
Decreases
Increases
What happens to the specific gravity of a NiCad cell during recharging?
Drops to zero
Remains constant
Decreases
Increases
How is the state of charge of a NiCad battery determined?
Perform a capacity check
Specific gravity
Put a known amount of charge into the battery
Measure the voltage
What charging rate (% of AH rating) is typically used when servicing NiCad batteries?
80%
150%
100%
140%
When would you be required to adjust the electrolyte level of a NiCad battery immediately after charging has started?
Topping up electrolyte at the start of the charge cycle is standard procedure.
Never
Only if electrolyte level is low
When greater than 1.5 V cell voltage is measured
What is the approximate voltage of a NiCad cell?
1.5 V
2.0 V
1.2 V
2.1 V
What is a benefit of NiCad batteries compared to Lead Acid Batteries?
NiCad batteries are not susceptible to thermal runaway
NiCad batteries require fewer cells for the same voltage
NiCad batteries maintain an almost constant voltage throughout discharge
NiCad electrolyte is less corrosive & dangerous than Lead Acid electrolyte
What happens when a NiCad battery is overcharged?
Risk of explosion as the water in the electrolyte breaks down
Hydrogen gas is released at the negative plates
Oxygen gas is released at the positive plates
All of the above
What is the required next step if a NiCad battery fails its capacity check?
Tag serviceable & place on shelf
Recharge
Deep cycle
Tag unserviceable & scrap
What is done during a NiCad battery deep cycle when cell voltage drops below .5 volts?
Remove cell from battery
Nothing, continue to monitor
Short the cell with shorting strip
Disconnect cell from battery
How long should you wait to take further action once the cells have been shorted on a NiCad battery?
12 hours
1 hour
30 minutes
3 hours
Why is it important that all paperwork be completed when servicing NiCad batteries?
Because paperwork is required for battery to be serviceable
To maintain history of the battery for determining useful life remaining
Because paperwork is FUN!
To avoid repetition of work already performed when determining state of charge of battery
What can happen if a flooded Lead Acid and a NiCad battery come into contact with each other during servicing?
Electrolytes (and their fumes) can neutralize each other
Nothing, there is no problem
Thermal runaway
Dielectric breakdown
What is the next course of action if a NiCad battery passes its capacity check?
Recharge
Deep cycle
Tag serviceable & place on shelf
Fully discharge
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