Aux 1 Unit 16 Q4

Correct Answer: B) The battery is partially or fully discharged

Explanation: A low specific gravity reading in a lead-acid battery indicates that the battery is partially or fully discharged, as the specific gravity decreases as the battery discharges.

Correct Answer: B) Failing to check and maintain the electrolyte levels in lead-acid batteries

Explanation: Failing to maintain the correct electrolyte levels in lead-acid batteries can lead to reduced charge and capacity. Low electrolyte levels expose the plates, leading to sulfation and reduced battery efficiency.

Correct Answer: B) It can lead to sulfation in lead-acid batteries and reduced capacity over time

Explanation: Repeated deep discharges can cause sulfation in lead-acid batteries, where lead sulfate crystals form on the plates, reducing the battery’s capacity and overall lifespan.

Correct Answer: B) Long periods of inactivity without maintenance charging

Explanation: Long periods of inactivity without maintenance charging can lead to self-discharge, reducing the battery’s charge over time. Regular charging is necessary to maintain the charge in a battery that is not in use.

Correct Answer: A) Measuring the voltage across the battery terminals

Explanation: The voltage across the battery terminals can also indicate the state of charge in a lead-acid battery. A higher voltage typically indicates a higher state of charge, while a lower voltage suggests the battery is more discharged.

Correct Answer: B) Measuring the specific gravity of the electrolyte using a hydrometer

Explanation: The specific gravity of the electrolyte in a lead-acid battery changes with the state of charge. A hydrometer is used to measure the specific gravity, which directly correlates to the battery’s level of charge.

Correct Answer: B) By measuring the voltage across the battery terminals

Explanation: In alkaline batteries, the state of charge is most commonly determined by measuring the voltage across the terminals. Unlike lead-acid batteries, the electrolyte in alkaline batteries does not change in specific gravity, so voltage measurement is the preferred method.

Correct Answer: A) Operating the battery at very high or very low temperatures

Explanation: Extreme temperatures, either too high or too low, can reduce the battery’s charge. High temperatures can accelerate self-discharge and damage the battery, while low temperatures can slow down the chemical reactions, reducing the effective charge.

Correct Answer: B) Because the specific gravity of the electrolyte in alkaline batteries does not change significantly with charge

Explanation: The specific gravity of the electrolyte in alkaline batteries does not change significantly with the charge state, making it an ineffective method for determining the charge level. Voltage measurement is preferred instead.

Correct Answer: B) As batteries age, their ability to hold a charge decreases due to the gradual degradation of the active materials inside the battery

Explanation: As batteries age, the active materials inside degrade, leading to a reduced ability to hold a charge. This natural aging process affects all types of batteries and reduces their overall efficiency and capacity.