Computer and Mobile Phone Cleaning and Maintenance

Question 1

What is the primary purpose of servicing computers and mobile phones?

Accepted Answer

Servicing is the regular process of cleaning, inspecting, repairing, and maintaining a device to ensure it remains in optimal working condition.

Question 2

What is a primary consequence of dust accumulation inside computers and mobile phones?

Accepted Answer

Dust blocks cooling fans and ventilation ports, leading to overheating, which degrades hardware and reduces processing speed.

Question 3

What can moisture and grease primarily cause on electronic circuits?

Accepted Answer

Moisture and grease can cause corrosion on electronic circuits, leading to short circuits and system failure.

Question 4

Which tool is specifically used to separate clipped plastic casings without scratching or denting the device?

Accepted Answer

Pry tools, such as plastic opening tools, guitar picks, or spudgers, are used to separate clipped plastic casings.

Question 5

What is the purpose of a magnetic screw mat during device servicing?

Accepted Answer

A magnetic screw mat holds loose screws and small metal parts in place, preventing them from rolling away or getting lost during disassembly.

Question 6

Which tool is used to blow dust out of hard-to-reach areas like heat sinks, vents, and charging ports?

Accepted Answer

Air blowers (manual rubber squeeze blowers or cans of compressed air) are used to blow dust out of hard-to-reach areas.

Question 7

Which cleaning liquid is highly effective for cleaning printed circuit boards (PCBs) and metal connectors because it evaporates quickly without leaving water residue?

Accepted Answer

Methylated spirit is highly effective for cleaning PCBs and metal connectors due to its quick evaporation without residue.

Question 8

Which specialized chemical solvent is designed to clean electrical contacts, switches, and connectors, often packaged in pressurized aerosol cans?

Accepted Answer

Contact cleaner is a specialized chemical solvent for electrical contacts, switches, and connectors, typically in aerosol cans.

Question 9

Which cleaning liquid has a low safety level and is highly destructive to plastics and rubber, only to be used on bare metal components with extreme care?

Accepted Answer

Thinner has a low safety level and is highly destructive to plastics and rubber, suitable only for bare metal with extreme care.

Question 10

Why is fuel (petrol) highly discouraged as a cleaning alternative for electronic devices?

Accepted Answer

Fuel (petrol) is highly discouraged because it is extremely flammable, leaves a greasy residue that attracts dust, emits toxic fumes, and can damage plastic and rubber components.

Question 11

What is a key property of methylated spirit that makes it suitable for cleaning electronic components?

Accepted Answer

Methylated spirit evaporates quickly without leaving water residue, preventing short circuits.

Question 12

What is the first and most crucial safety step before applying any cleaning liquid to a computer or mobile phone?

Accepted Answer

Always turn off the computer or mobile phone and remove the battery (if removable) before applying any liquid.

Question 13

Why is it important to ensure adequate ventilation when working with chemical solvents?

Accepted Answer

Adequate ventilation is important to avoid inhaling toxic fumes from methylated spirit, contact cleaner, or thinner.

Question 14

After cleaning components with liquids, what crucial step must be taken before reassembling and powering on the device?

Accepted Answer

Ensure the cleaned components are completely dry before reassembling and powering on the device.

Question 15

What is the very first step in the procedure for disassembling a computer for servicing?

Accepted Answer

Shut down the computer completely and unplug the power cable from the wall outlet.

Question 16

When cleaning computer fans, what specific action should be taken to prevent damage to the fan motor?

Accepted Answer

Hold the fan blades stationary with a finger or a plastic tool to prevent them from spinning rapidly.

Question 17

Which of the following is NOT a step in testing the functionality of a serviced computer?

Accepted Answer

Reinstalling the operating system.

Question 18

During mobile phone disassembly, what is the first component that should be disconnected from the motherboard to cut off electrical power?

Accepted Answer

The battery connector should be disconnected first from the motherboard using a plastic spudger.

Question 19

Which cleaning liquid is specifically recommended for spraying into mobile phone charging ports and headphone jacks to dissolve accumulated lint and grease?

Accepted Answer

Contact cleaner is recommended for spraying into mobile phone charging ports and headphone jacks.

Question 20

Which of the following is a crucial step in testing the functionality of a serviced mobile phone?

Accepted Answer

Making a test phone call to verify that the microphone, earpiece, and loudspeaker are working clearly.

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