Batteries

G8085. A lead-acid battery with 12 cells connected in series (no-load voltage = 2.1 volts per cell) furnishes 10 amperes to a loaf of 2-ohms resistance. The internal resistance of the battery in this instance is

0.52 ohm.

G8090. 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 series 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.

1 and 2

A. Aircraft which operate only ac generators (alternators) as a primary source of electrical power normally provide current suitable for battery charging through the use of

A step down transformer and a rectifier

A8918. The purpose of a rectifier in an electrical system is to change

Alternating current to direct current

G8086. If 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.

G8095. 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.

G8099. How can the state-of-charge of nickel-cadmium battery be determined?

By a measured discharge

G8101. In nickel-cadmium batteries, a rise in cell temperature

Causes a decrease in internal resistance

A. The inductor-type inverter output voltage is controlled by the

DC stator field current

G8096. The electrolyte of a nickel-cadmium battery is the lowest when the battery is

In a discharged condition.

G8098. Nickel-cadmium batteries which are stored for a long period of time will show a low liquid level because

Electrolyte becomes absorbed into the plates.

Which of the following is most likely to cause thermal-runaway in a nickel-cadmium battery?

Excessive draw from the battery

G8100. What may result if water is added to a nickel-cadmium battery when it is not fully charged?

Excessive spewing is likely to occur during the charging cycle

G8093. Which condition is an indication of improperly torqued cell link connections of a nickel-cadmium battery?

Heat or burn marks on the hardware.

G8101-1. Which of the following best describes the contributing factors to thermal runaway 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 (voltage) charging system.

G8088. A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because

Most of the acid is in the solution.

G8094. 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 .

G8092. 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

G8020-1. Which effect does not apply to the movement of electrons flowing in a conductor?

Static energy

G8072. When referring to an electrical circuit diagram, what point is considered to be at zero voltage?

The ground reference

G8087. 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

G8089. 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

G8095-1. Which of the following best describes the operating principal in nickel-cadmium battery installed in an aircraft?

To completely charge a nickel-cadmium battery, some gassing must take place; thus, some water will be used.

G8091. The method used o rapidly charge a nickel-cadmium battery utilizes

constant voltage and varying current

G8097. 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.

G8096-1. The electrolyte of a nickel cadmium battery is highest when the battery is

in a fully charged condition

G8102. When a charging current is applied to a nickel cadmium battery, the cells emit gas

toward the end of the charging cycle.