2.5.3 Practice Questions

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Mechanical Engineering

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Jan 9, 2024

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Question 1: Correct A new laptop was delivered to your home and left on the porch while you were at work. It is very cold outside, and you don't know how long it has been there. You unpack the laptop. You would like to know if it is working properly. Which of the following is the BEST action to take? Answer Blow compressed air into the cooling ports before turning the laptop on. Correct Answer: Let the laptop warm up to room temperature before turning it on. Turn on the laptop and run self-diagnostic tests. Place the laptop next to a heater set to High. Visually inspect the LCD screen for cracks before turning the laptop on. Explanation If a laptop has been in a cold environment, you should let it warm up to room temperature before turning it on. Otherwise, the heat produced by the components might create water condensation. This water might then damage system components. Avoid turning on the laptop to run self-diagnostic tests before letting it warm up to room temperature. Blowing compressed air into the cooling ports will not warm up the laptop. Visually inspecting the LCD screen for cracks is an option, but you should let the laptop warm up to room temperature before doing anything. Placing the laptop next to a heater set to High would be a poor strategy for warming the system up because it could potentially melt the plastic parts within the unit. References  2.5.2 PC Maintenance Facts q_maintclean_cold_laptop_pp7.question.fex Question 2: Correct Which of the following are common tools used to physically clean the inside of a computer? (Select two.) Answer

Industrial degreaser Correct Answer: Compressed air Damp rag Correct Answer: Natural bristle brush Wire brush Explanation You can use a natural bristle brush and a can of compressed air to blow dust off of a motherboard and other circuit cards. Never use anything harsh on the inside of a computer, such as a wire brush or industrial degreasers. Rags are also discouraged because they easily snag on electrical leads and parts. References  2.2.2 Environmental Facts  2.5.1 PC Maintenance Best Practices  2.5.2 PC Maintenance Facts q_maintclean_cpu_cleaning_pp7.question.fex Question 3: Correct What should you use to clean an inkjet printer's print heads? Answer Damp cloth Anti-static vacuum Denatured alcohol Correct Answer: The printer's cleaning function Explanation On inkjet printers, use the printer's cleaning function to clean the print heads. Do not use an anti-static vacuum, denatured alcohol, or a damp cloth to clean the print heads.

References  2.5.2 PC Maintenance Facts  13.3.3 Inkjet Printers  13.3.4 Inkjet Printer Facts q_maintclean_inkject_clean_pp7.question.fex Question 4: Correct Which of the following are most helpful in keeping a computer cool? (Select two.) Answer Correct Answer: Vacuum dust from the system regularly. Install a thermostat in the fan circuit. Remove the slot cover from the back of the computer. Use a high-wattage power supply. Correct Answer: Verify that cooling fans are not circulating air in the wrong direction. Explanation Vacuuming dust from the system is critical to keeping the computer cool. In addition, verify that your cooling fans are blowing air in the right direction and are not working against each other. Do not remove any slot covers in an attempt to cool the computer. Lacking slot covers decreases the fan's ability to remove hot air from inside the computer. Installing a thermostat in the fan circuit is not necessary. References  2.2.2 Environmental Facts  2.5.1 PC Maintenance Best Practices  2.5.2 PC Maintenance Facts q_maintclean_keep_cool_pp7.question.fex Question 5: Incorrect Which problem can occur if your system case fan blows in the wrong direction? Answer Incorrect answer: Extensive dust can build up and the system can overheat.

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Correct Answer: The flow of air is negated and the system can overheat. Condensation can build up in the computer. A rapid change from cold to warm can cause damage to the components. Explanation Verify that your system's cooling fans are blowing air through the system case in the correct direction. A fan blowing in the wrong direction can negate the airflow through the case and cause the system to overheat. Although extensive dust, a rapid change from cold to warm, and condensation are valid concerns, they are not direct results of fans blowing in the wrong direction. References  2.5.2 PC Maintenance Facts  3.3.3 Motherboard Components  3.9.1 Processor Concepts  3.9.5 Install a Processor  15.1 Build a Computer From Scratch q_maintclean_laptop_overheat_pp7.question.fex Question 6: Correct You are a system administrator for a financial institution. Most of your employees work at home and have various work environments. One of your account managers is complaining that customer data is disappearing from her account management application. She insists that she saves data regularly and has not had a problem until recently. Her workstation has both a solid-state drive (SSD) and a traditional hard drive. She runs the application from the SSD drive, but stores the customer data on the hard drive. She has recently moved her desk to a room in her house that is used for entertainment. The room has a sound system with several installed speakers for surround sound. Which of the following types of interference might be causing the issue with disappearing customer data? Answer Radio frequency interference (RFI) Negative pressure HVAC system Electromagnetic interference (EMI)

Correct Answer: Magnetic fields Explanation Hard drives use magnetic charges to store data. While hard disks are shielded and protected from all but the strongest magnets, getting a magnet too close to these components (such as speakers) could erase data. In this case, the employee keeps her customer data on her hard drive and has moved her computer to a room full of speakers that could cause data loss. Electromagnetic interference (EMI) is interference that affects wired network signals. It does not cause data loss on a hard drive. Radio frequency interference (RFI) is interference on a radio channel used by wireless networking devices. RFI does not cause data loss on a hard drive. Negative pressure HVAC systems can cause dust accumulation in a computer, which can lead to overheating, but this is not normally associated with hard drive data loss. References  2.5.1 PC Maintenance Best Practices  2.5.2 PC Maintenance Facts  11.9.1 Network Troubleshooting  11.9.3 Network Troubleshooting Facts q_maintclean_magnetic_fields_trb_pp7.question.fex Question 7: Correct Which of the following statements about cleaning LCD monitors and display devices is true? Answer Most new monitors are self-cleaning and should not be cleaned using external methods. An LCD monitor is best cleaned using a lint rag and glass cleaner. Monitors are best cleaned while powered on in order to observe the effectiveness of your cleaning. Correct Answer: You should power off your monitor and clean it with a lint-free dry cloth. Explanation In general, an LCD monitor is best cleaned using a dry cloth with the monitor turned off. Cleaning cloths should always be lint-free.

Cleaning a monitor or display device with the unit powered on often hides places on the screen that need cleaning (such as spots or smears). Always avoid using cloths with lint and glass cleaner. The glass cleaner can cause damage to the monitor's surface. While many newer monitors do have certain automatic calibration features, self- cleaning is not one of them. References  2.5.2 PC Maintenance Facts q_maintclean_monitor_cleaning_pp7.question.fex Question 8: Correct Which of the following is true about negative pressure systems? Answer They filter out airborne particles. They force air out through windows, doors, and other openings. Correct Answer: They can bring in airborne particles, such as dust or smoke. They are more energy-effective than positive pressure systems. Explanation Negative pressure systems draw air in, potentially bringing in airborne particles, such as dust or smoke. In areas with heavy smoke or dust, add filters to air intake systems to filter out airborne particles. Positive pressure systems are more energy-effective. Positive pressure systems protect the air quality in a facility by causing air to be forced out through doors, windows, and other openings. References  2.1.3 Electrostatic Discharge  2.2.1 Environmental Concerns  2.2.2 Environmental Facts  2.5.1 PC Maintenance Best Practices  2.5.2 PC Maintenance Facts q_maintclean_negative_pressure_facts_pp7.question.fex Question 9: Correct

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Which of the following is true about RFI? Answer Unshielded twisted-pair cables and fiber optic cables can protect RFI signals. You can reduce RFI by using a wireless networking standard that operates in the 2.4 GHz range. RFI is caused by motors, machinery, and fluorescent lights. Correct Answer: RFI is caused by nearby devices, such as cordless phones or microwave ovens. Explanation RFI (radio frequency interference) is caused by nearby wireless devices using the same channel, cordless phones, or microwave ovens. EMI (electromagnetic interference) is caused by motors, heavy machinery, and fluorescent lights. Use shielded twisted-pair cables to protect signals sent on Ethernet twisted-pair cabling. If necessary, use fiber optic cables to eliminate the effects of interference. Wireless networks that use the 2.4 GHz frequency range (801.11b and 802.11g) are susceptible to RFI. References  2.5.1 PC Maintenance Best Practices  2.5.2 PC Maintenance Facts  11.9.1 Network Troubleshooting  11.9.3 Network Troubleshooting Facts q_maintclean_rfi_facts_pp7.question.fex Question 10: Incorrect Which of the following features should you look for when selecting a vacuum cleaner for your cleaning kit? (Select two.) Answer Correct Answer: Blows as well as vacuums Static induction motor Coarse grade bag Incorrect answer: Washable filters

Correct Answer: Non-static generation Explanation It's important to select a vacuum cleaner for use with computer equipment that won't generate harmful static. Electrostatic discharge should always be avoided around sensitive computer components, and one that blows as well as vacuums can be important as it may be better to remove dust and other foreign matter by applying a blowing force rather than vacuuming. A static induction motor relies on static electricity, which can damage computer components. Washable filters are not necessary when looking for a vacuum for your computer cleaning kit. The bag used in your computer cleaning kit vacuum should be fine enough to collect toner particles (instead of a coarse grade bag). Otherwise, these particles may circulate within and outside the vacuum and spread toner.