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WorksheetsBasic Electricity (Batteries)
Total questions: 20
Worksheet time: 30secs
When a charging current is applied to a nickel cadmium battery, the cells emit gas
toward the end of the charging cycle.
throughout the charging cycle.
especially if the electrolyte level is high.
Which of the following best describes the contributing factors to thermal runaway in a nickel-cadmium battery installed in an aircraft?
High internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential charging system.
Low internal resistance intensified by high cell temperatures and a high voltage discharge/charge rate in a constant current charging system.
Low internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential charging system.
In nickel-cadmium batteries, a rise in cell temperature
causes an increase in internal resistance.
causes a decrease in internal resistance.
increases cell voltage.
What may result if water is added to a nickel-cadmium battery when it is not fully charged?
Excessive electrolyte dilution.
Excessive spewing is likely to occur during the charging cycle.
No adverse effects since water may be added anytime.
How can the state-of-charge of a nickel-cadmium battery be determined?
By measuring the specific gravity of the electrolyte.
By a measured discharge.
By the level of the electrolyte.
Nickel-cadmium batteries which are stored for a long period of time will show a low liquid level because
electrolyte evaporates through the vents.
of current leakage from individual cells.
electrolyte becomes absorbed into the plates.
The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge,
must be 1.2 to 1.3 volts per cell.
must be 1.4 volts per cell.
depends upon its temperature and the method used for charging.
The electrolyte of a nickel cadmium battery is highest when the battery is
- in a fully charged condition.
in a discharged condition.
under a no-load condition.
The electrolyte of a nickel-cadmium battery is the lowest when the battery is
being charged.
in a discharged condition.
under a heavy load condition.
What is the likely result of servicing and charging nickel-cadmium and lead acid batteries together in the same service area?
Lowered amp-hour capacities, for both types of batteries.
Reduced battery service life for both types of batteries.
Contamination of both types of batteries.
The presence of any small amount of potassium carbonate deposits on the top of nickel-cadmium battery cells in service is an indication of
normal operation.
excessive gassing.
plate sulfation.
Which condition is an indication of improperly torqued cell link connections of a nickel-cadmium battery?
Light spewing at the cell caps.
Toxic and corrosive deposits of potassium carbonate crystals.
Heat or burn marks on the hardware.
The purpose of providing a space underneath the plates in a lead acid battery's cell container is to
prevent sediment buildup from contacting the plates and causing a short circuit.
allow for convection flow of the electrolyte in order to provide for cooling of the plates.
ensure that the electrolyte quantity ratio to the number of plates and plate area is adequate.
The method used to rapidly charge a nickel-cadmium battery utilizes
constant current and constant voltage.
constant current and varying voltage.
constant voltage and varying current.
Which of the following statements is/are generally true regarding the charging of several aircraft batteries together?
1. Batteries of different voltages (but similar capacities) can be connected in series with each other across the charger, and charged using the constant current method.
2. Batteries of different ampere-hour capacity and same voltage can be connected in parallel with each other across the charger, and charged using the constant voltage method.
3. Batteries of the same voltage and same ampere-hour capacity must be connected in series with each other across the charger, and charged using the constant current method.
3
2 and 3.
1 and 2.
What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?
The total plate area of the battery.
The state-of-charge of the battery.
The ampere-hour capacity of the battery.
A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because
the acid is in the plates, thereby increasing the specific gravity of the solution.
- most of the acid is in the solution.
-increased internal resistance generates sufficient heat to prevent freezing.
Which statement regarding the hydrometer reading of a lead-acid storage battery electrolyte is true?
The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80°F.
A specific gravity correction should be added to the hydrometer reading if the electrolyte temperature is below 59°F.
The hydrometer reading will give a true indication of the capacity of the battery regardless of the electrolyte temperature.
If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?
Apply boric acid solution to the affected area followed by a water rinse.
Rinse the affected area thoroughly with clean water.
Apply sodium bicarbonate solution to the affected area followed by a water rinse.
A lead-acid battery with 12 cells connected in series (no-load voltage = 2.1 volts per cell) furnishes 10 amperes to a load of 2-ohms resistance. The internal resistance of the battery in this instance is
0.52 ohm.
2.52 ohms.
5.0 ohms.
