CMT CMT Accessories & Peripheral Devices 2 — Questions and Answers
Question 1: What is the recommended method for cleaning a mobile device's charging port?
- Use a dry, non-conductive tool (toothpick or specialized pick) to gently remove debris without using liquids or metal objects (Correct answer)
- Spray compressed air directly into the port at full pressure
- Use rubbing alcohol applied with a cotton swab
- Use a metal pin to dislodge debris
Correct answer: Use a dry, non-conductive tool (toothpick or specialized pick) to gently remove debris without using liquids or metal objects
Metal tools risk shorting pins, and liquids can cause corrosion; a dry non-conductive pick is the safest method.
Question 2: A customer's phone shows 'Charging Slowly' when connected to a USB port on a computer. Why?
- Standard USB-A ports typically deliver only 0.5-0.9W, far less than the 5W or more provided by wall chargers (Correct answer)
- The phone battery is failing
- The USB cable is defective
- The phone's OS is throttling charging
Correct answer: Standard USB-A ports typically deliver only 0.5-0.9W, far less than the 5W or more provided by wall chargers
Computer USB host ports are low-current by design and are not intended for efficient smartphone charging.
Question 3: What differentiates a protective case rated for 'military standard' (MIL-STD-810G)?
- It has been tested to withstand specific conditions including drop, vibration, humidity, and temperature extremes (Correct answer)
- It is manufactured by a military contractor only
- It provides waterproofing to 30 meters
- It includes built-in encryption
Correct answer: It has been tested to withstand specific conditions including drop, vibration, humidity, and temperature extremes
MIL-STD-810G certification indicates the case has passed a series of environmental and mechanical stress tests.
Question 4: What does 'NFC' stand for and what accessory use does it enable?
- Near Field Communication; enables contactless payments, smart tags, and pairing with NFC accessories (Correct answer)
- Network Frequency Control; manages Wi-Fi channels
- Non-Functional Component; placeholder hardware
- New Format Connector; describes USB-C
Correct answer: Near Field Communication; enables contactless payments, smart tags, and pairing with NFC accessories
NFC enables short-range communication for mobile payments, transit passes, and accessory pairing within a few centimeters.
Question 5: A customer wants to use their phone as a laptop replacement with a keyboard and monitor. Which connection standard enables desktop-class video output from a USB-C port?
- USB-C with DisplayPort Alternate Mode (DP Alt Mode) or Thunderbolt 3/4 (Correct answer)
- Bluetooth 5.0
- USB-A 3.0
- NFC
Correct answer: USB-C with DisplayPort Alternate Mode (DP Alt Mode) or Thunderbolt 3/4
DisplayPort Alt Mode over USB-C allows full 4K video output to external monitors directly from compatible smartphones.
Question 6: What is the main risk of using a fast charger rated higher than the device's maximum input rating?
- The device will only draw its rated maximum; the risk is using low-quality chargers that may not regulate voltage properly (Correct answer)
- It will permanently damage the battery immediately
- It charges too slowly
- It disables wireless charging permanently
Correct answer: The device will only draw its rated maximum; the risk is using low-quality chargers that may not regulate voltage properly
Properly designed devices negotiate charging speed via the charging protocol, but counterfeit high-watt chargers may bypass safety negotiation.
CMT CMT Accessories & Peripheral Devices 2
What is the recommended method for cleaning a mobile device's charging port?