Batteries

The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge,

•   depends upon its temperature and the method used for charging.

•   must be 1.2 to 1.3 volts per cell.

•   must be 1.4 volts per cell.

A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because

•   most of the acid is in the solution.

•   the acid is in the plates, thereby increasing the specific gravity of the solution.

•   increased internal resistance generates sufficient heat to prevent freezing.

What is the purpose of the battery sump jar in the battery ventilating system?

•   to neutralize the acid fumes.

•   to contain any spilled electrolyte.

•   holds spare water to replace that which evaporates during charging.

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.

•   plate sulfation.

•   excessive gassing.

The method used to rapidly charge a nickel-cadmium battery utilizes

•   constant current and varying voltage.

•   constant current and constant voltage

•   constant voltage and varying current.

What method of charging batteries is employed on an operating aircraft?

•   constant current

•   constant voltage

•   batteries are not charged on an aircraft

What will be the results of increasing the number of cells connected in series in a battery?

•   increased voltage and amperage.

•   increased volts only.

•   increased amps only.

The purpose of providing a space underneath the plates in a lead acid battery's cell container is to

•   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.

•   prevent sediment buildup from contacting the plates and causing a short circuit.

Which neutralizing agent is used with lead-acid batteries?

•   vinegar

•   boric acid

•   bicarbonate of soda

What type material is the lead plates changed into during a discharge cycle?

•   nickel peroxide

•   cadmium salts

•   lead sulphate