CMT Cheat Sheet 2026

The 30 highest-yield CMT facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What does the USB Power Delivery (USB-PD) standard define? → A protocol allowing negotiated fast charging at higher voltages and currents over USB-C
2. Which component in a mobile device is responsible for wireless communication? → Wireless communication module
3. What is the purpose of mobile device encryption? → To track mobile device usage
4. What is mobile device management (MDM)? → A set of tools to manage and secure mobile devices
5. What does a 'hard reset' of a mobile device do? → Fixes software bugs
6. What does professional liability insurance (errors and omissions) protect a repair technician from? → Claims that the technician's work caused damage or loss to a customer's device or data
7. A technician notices a mobile device battery is visibly bulging. What is the correct course of action? → Replace the battery immediately as it poses a fire and explosion risk
8. A customer asks for a repair that you believe is not cost-effective compared to a replacement. You should: → Honestly present both options with costs so the customer can decide
9. Which practice best demonstrates active listening when a customer describes a problem? → Paraphrasing the customer's description back to confirm understanding
10. Which practice is considered unethical in mobile device repair? → Billing for parts that were not used or replacing parts that did not need replacement
11. What is the role of Wi-Fi in mobile device connectivity? → To enable high-speed internet access through local networks
12. What is the purpose of Safe Mode on Android? → It boots the device with only pre-installed apps to isolate third-party app issues
13. What is Bluetooth technology used for in mobile devices? → To wirelessly connect to peripherals
14. What is the purpose of a mobile hotspot? → To share cellular data with other devices
15. Why is it important to obtain customer authorization before performing additional repairs discovered during service? → To ensure the customer agrees to additional costs and maintains trust
16. Which of the following is a common mobile device processor brand? → Qualcomm Snapdragon
17. What is the first step in troubleshooting a mobile device? → Identify the problem by assessing symptoms
18. Which communication style is most effective when explaining a technical issue to a non-technical customer? → Use plain language and avoid jargon
19. What information must be included on a compliant parts warranty document provided to a customer? → Duration of the warranty, what is covered, what is excluded, and how to make a claim
20. What is the difference between 4G and 5G network technology? → 5G offers faster speeds and lower latency than 4G
21. What does the term 'battery capacity' refer to in mobile devices? → The total charge a battery can store, measured in milliamp-hours (mAh)
22. What is the primary difference between iOS and Android regarding app installation from third-party sources? → Android allows sideloading APKs; iOS restricts installs to the App Store by default
23. What is the role of mobile device diagnostic tools? → To fix software bugs
24. What is 'battery memory effect' and which battery chemistry is most susceptible to it? → Reduced capacity from repeated partial discharges; most common in NiCd
25. What is the benefit of using a standardized checklist when completing a repair? → It ensures consistent quality and provides documentation of steps completed
26. What is the primary purpose of maintaining a written repair agreement with each customer? → To legally define the scope of work, pricing, and liability for both parties
27. What is the recommended frequency for backing up business repair records and customer data? → Daily automated backups with offsite or cloud storage for disaster recovery
28. A customer claims their screen was cracked when returned, but it was cracked before intake. Which record protects the technician? → The signed intake form documenting pre-existing damage
29. Which document type serves as the binding agreement between the repair shop and customer prior to beginning work? → A signed work order or repair authorization form
30. What are the benefits of enabling two-factor authentication on mobile devices? → It adds an extra layer of security