Why must all metal enclosures of station equipment be grounded?
The correct answer is D: It ensures that hazardous voltages cannot appear on the chassis. Why all metal enclosures of station equipment must be grounded is to ensure that hazardous voltages cannot appear on the chassis. Proper grounding prevents dangerous voltages from building up on equipment enclosures, protecting operators. For amateur radio operators, this is a critical safety requirement. Understanding this helps ensure station safety.
Exam Tip
Ground metal enclosures = ensures hazardous voltages cannot appear on chassis. Think 'G'round = 'G'uarantees 'S'afety (prevents hazardous voltages). Proper grounding prevents dangerous voltages from building up on equipment enclosures. Not fuses, not signal overload, not neutral - just hazardous voltage prevention.
Memory Aid
"Ground metal enclosures = ensures hazardous voltages cannot appear on chassis. Think 'G'round = 'G'uarantees 'S'afety. Proper grounding prevents dangerous voltages from building up on equipment enclosures. Critical safety requirement."
Real-World Application
All metal equipment enclosures are grounded. If an internal fault occurs (e.g., hot wire touches chassis), the ground connection provides a path for current, preventing hazardous voltage from appearing on the chassis. This protects you from electrical shock. Grounding is essential for safety.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Grounding doesn't prevent blown fuses - fuses protect against overcurrent, not grounding issues. Fuse protection is different.
Option B: Incorrect. Grounding doesn't prevent signal overload - that's about signal levels, not grounding. Signal overload is different.
Option C: Incorrect. Grounding doesn't ensure neutral wire is grounded - neutral grounding is done at the service entrance, not at equipment. Neutral grounding is different.
题目解析
The correct answer is D: It ensures that hazardous voltages cannot appear on the chassis. Why all metal enclosures of station equipment must be grounded is to ensure that hazardous voltages cannot appear on the chassis. Proper grounding prevents dangerous voltages from building up on equipment enclosures, protecting operators. For amateur radio operators, this is a critical safety requirement. Understanding this helps ensure station safety.
考试技巧
Ground metal enclosures = ensures hazardous voltages cannot appear on chassis. Think 'G'round = 'G'uarantees 'S'afety (prevents hazardous voltages). Proper grounding prevents dangerous voltages from building up on equipment enclosures. Not fuses, not signal overload, not neutral - just hazardous voltage prevention.
记忆口诀
Ground metal enclosures = ensures hazardous voltages cannot appear on chassis. Think 'G'round = 'G'uarantees 'S'afety. Proper grounding prevents dangerous voltages from building up on equipment enclosures. Critical safety requirement.
实际应用示例
All metal equipment enclosures are grounded. If an internal fault occurs (e.g., hot wire touches chassis), the ground connection provides a path for current, preventing hazardous voltage from appearing on the chassis. This protects you from electrical shock. Grounding is essential for safety.
错误选项分析
Option A: Incorrect. Grounding doesn't prevent blown fuses - fuses protect against overcurrent, not grounding issues. Fuse protection is different. Option B: Incorrect. Grounding doesn't prevent signal overload - that's about signal levels, not grounding. Signal overload is different. Option C: Incorrect. Grounding doesn't ensure neutral wire is grounded - neutral grounding is done at the service entrance, not at equipment. Neutral grounding is different.
知识点
Metal enclosures, Grounding, Hazardous voltages, Chassis safety
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.