Operational Procedures: Use Common Safety procedures Flashcards
CompTIA A+ 220-1102 Exam Criteria
What is an ESD?
What do you mean by electrostatic discharge?
ESD (electro static discharge) is the transfer of an electrical charge between two electrically charged objects. A well-known example of ESD is the shock you receive after walking across a carpet and touching a metal door handle
What equipment are used to avoid ESD?
ESD Prevention – avoid ruining circuitry
ESD straps
ESD mats
Equipment grounding
Antistatic bags
Electronics Vacuum
What are the three factors of proper power handling?
Power down device
Disconnect from UPS or AC outlet
Discharge residual power - press the power button after disconnection to properly discharge
What personal safety can you consider when your handling a computer?
Personal safety
Disconnect power before repairing PC
Lifting techniques
Electrical fire safety
Safety goggles
Air filtration mask
What other factors do you need to consider when considering safety procedure policies?
Proper component handling and storage.
Compliance with government regulations.
What are the factors the generate and promote the transmission of ESD?
The factors that generate and promote the transmission of ESD are moving machines, moving people, improper grounding, and humidity below 40 percent.
While working with devices, you should always ensure that the humidity level is around 40 to 45 percent. Humidity levels below 40 percent will promote the generation of ESD.
When the humidity is above 40 percent, static electricity is not generated to transmit to the devices. ESD is more likely to build up under cool and dry conditions.
What do you need to consider in the server room?
Low humidity in the server room can cause static electricity. Static electricity is mainly caused in dry conditions when two dissimilar objects come in contact with each other. This electricity travels through the body and a spark is produced on the fingertips when the person touches something. Static electricity can cause severe damage to electronic computer components, such as the motherboard, hard disk, and random access memory. Therefore, the humidity level in the server room should not be low. Organizations can install a humidifier to maintain the correct level of humidity in the room. Technicians working with internal computer components can also wear anti-static wristbands to prevent damage from static electricity.
Low humidity in the server room does not cause corrosion. Corrosion is a result of high humidity and can adversely affect performance of the computer system by reducing the electrical efficiency of connectors.
Low humidity in the server room does not cause electric shocks. An electric shock occurs when an individual comes in direct contact with uncovered electric wires or when a person is not properly grounded. To prevent electric shocks, electrical equipment should be properly grounded and individuals should wear protective gears, such as rubber-soled shoes and rubber gloves while servicing electrical circuits. Equipment grounding ensures that an individual device is grounded against ESD.
What causes power fluctuation?
Low humidity in the server room does not cause power fluctuations. A power fluctuation is caused either when power is in excess or shortage for a longer period of time or is momentary. Different types of devices are used to prevent power fluctuation depending on whether the type of fluctuation is high or low.
What are the operating humidity levels and ventilation?
As part of proper operational procedures, you should be aware of temperature and humidity levels and proper ventilation. This includes making sure that temperature and humidity controls are functioning. If the air conditioner is not working, you should contact building maintenance immediately. Humidity is best maintained between 40 and 60%. Below 40% allows the generation of static electricity, and above 60% may allow the development of condensation on equipment.
Why do we need to use ESD Wristband and Mat?
You should wear an anti-static wristband while servicing a computer to prevent ESD. Anti-static wristbands provide a conductive path to the ground and get rid of the ESD before it can damage your computer. You could also stand on an ESD mat.
What are the preferred clothing to wear when handling computers?
You should wear cotton clothes to prevent ESD because other materials, particularly synthetic and nylon, are known to be conductors of static charge. Therefore, to prevent against ESD, cotton clothes can be worn.
How can you self-ground?
You should keep your one hand in contact with the bare metal frame of the computer at all times to prevent against ESD. This step is useful when you are not wearing an anti-static wristband because this step will keep you electrically grounded. This is often referred to as self-grounding.
What type of extinguisher that involves Electrical Fire?
You should use a Class C fire extinguisher when the fire involves electrical equipment.
What type of extinguisher that involves wood and paper?
A Class A fire extinguisher is best used when the fire involves ordinary combustibles, such as wood and paper.
What type of extinguisher that involves Grease, oil and gasoline?
A Class B fire extinguisher is best used when the fire involves flammable liquids, such as grease, oil, and gasoline.
