Deep Dive: G0B12
The correct answer is C: To ensure that dangerous voltages are removed if the cabinet is opened. The purpose of a power supply interlock is to ensure that dangerous voltages are removed if the cabinet is opened. Interlocks disconnect power when cabinets are opened, preventing electric shock. For amateur radio operators, this is critical electrical safety. Understanding this helps ensure safe equipment operation.
Why Other Answers Are Wrong
Option A: Incorrect. Interlock doesn't prevent unauthorized changes - it's for safety, not warranty protection. Unauthorized changes aren't the purpose. Option B: Incorrect. Interlock doesn't shut down if too hot - that's thermal protection, not interlock. Overheating isn't the purpose. Option D: Incorrect. Interlock doesn't shut off if too much voltage - that's overvoltage protection, not interlock. Overvoltage isn't the purpose.
Exam Tip
Power supply interlock purpose = ensure dangerous voltages removed if cabinet opened. Think 'I'nterlock = 'I'nterrupts power when 'O'pened. Interlocks disconnect power when cabinets are opened, preventing electric shock. Not unauthorized changes, not overheating, not overvoltage - just remove voltage when opened.
Memory Aid
Power supply interlock purpose = ensure dangerous voltages removed if cabinet opened. Think 'I'nterlock = 'I'nterrupts power. Interlocks disconnect power when cabinets are opened, preventing electric shock. Critical electrical safety feature.
Real-World Example
A power supply interlock: When you open the cabinet, the interlock switch disconnects power, ensuring dangerous voltages are removed. This prevents electric shock if you touch internal components while the cabinet is open. Interlocks are safety devices - they ensure voltage is removed when cabinets are opened. This is the purpose - ensure dangerous voltages are removed if cabinet is opened.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G0B
Reference: 2023-2027 Question Pool · G0 - Electrical and RF Safety
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G0B topic.