Batteries Test

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.

What is the likely result of servicing and charging nickel-cadmium and lead acid batteries together in the same service area?

Contamination of both types of batteries.

If the electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?

Apply sodium bicarbonate solution to the affected area followed by a water rinse.

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 using the constant voltage method.

Both one and two.

How can the state-of-charge of a nickle-cadmium battery be determined?

By a measured dishcharge.

What may result if water is added to a nickle-cadmium battery when it is not fully charged?

Excessive spewing is likely to occur during the charging cycle.

Which condition is an indication of improperly torqued cell link connections of nickel-cadmium battery?

Heat or burn marks on the hardware.

Which of the following best describes the contributing factors to thermal runway in a nickel-cadmium battery installed in an aircraft?

Low internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential charging system.

Nickel-cadmium batteries which are stored for a long period of time will show low liquid level because?

electrolyte becomes absorbed into the plates.

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 degrees F.

What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?

The state-of-charge of the battery.

In nickel-cadmium batteries, a rise in cell temperature?

causes a decrease in internal resistance.

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

constant voltage and varying current.

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.

The electrolyte of a nickel-cadmium battery is the lowest when the battery is?

in a discharged condition.

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 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.

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

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

When a charging current is applied to a nickel cadmium battery, the cells emit gas?

toward the end of the charging cycle.