Which of the following devices provides protection against brownouts?
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A. B. C. D.A.
Out of the four given options, the device that provides protection against brownouts is a line conditioner, so the correct answer is D.
A brownout is a drop in voltage in an electrical power supply system, and it can cause damage to electronic devices, data loss, and other issues. A line conditioner is an electrical device that is designed to regulate and stabilize the voltage and current of an electrical power supply. It provides protection against power fluctuations, including brownouts.
Let's take a look at the other options and understand why they are not the correct answers.
A. Battery backup: A battery backup, also known as an uninterruptible power supply (UPS), provides temporary power to electronic devices in the event of a power outage. It can provide protection against power outages and blackouts, but it does not regulate voltage and cannot protect against brownouts.
B. Surge suppressor: A surge suppressor, also known as a surge protector, protects electronic devices from power surges, which are sudden increases in voltage that can damage electronic devices. However, it cannot regulate voltage and is not designed to protect against brownouts.
C. Rack grounding: Rack grounding is a process of grounding equipment to prevent electrical shock and damage to electronic devices. While it is an important safety measure, it does not provide protection against brownouts.
In summary, a line conditioner is the device that provides protection against brownouts, while the other options provide different types of protection for electronic devices but are not designed to protect against brownouts specifically.