What is a grounding strap and its purpose?

What is a grounding strap and its purpose?

• A. A high-resistance wire used for electrical isolation.
• B. A flexible cable assembly to carry power between components.
• C. A long piece of tubing used for fluid venting.
• D. A low-resistance conductor that ties components to the airframe ground to reduce noise and static.

Answer: (D)

The main idea being tested is how a grounding strap functions to control electrical potential and noise. A grounding strap is a low-resistance conductor that bonds components to the airframe ground, creating a common electrical reference and a quick path to discharge static charges. Because its impedance is very low, it can rapidly carry away stray charges, reducing electrical noise, preventing arcing, and protecting sensitive equipment. The strap is flexible to tolerate movement and temperature changes while maintaining a solid ground connection, typically tying a component’s chassis to a clean metal ground point on the airframe. The other descriptions don’t fit the purpose: a high-resistance wire wouldn’t effectively drain static or provide a reliable ground; a flexible cable meant to carry power is for delivering voltage, not grounding; and a long tubing for fluid venting has no electrical function.

The main idea being tested is how a grounding strap functions to control electrical potential and noise. A grounding strap is a low-resistance conductor that bonds components to the airframe ground, creating a common electrical reference and a quick path to discharge static charges. Because its impedance is very low, it can rapidly carry away stray charges, reducing electrical noise, preventing arcing, and protecting sensitive equipment. The strap is flexible to tolerate movement and temperature changes while maintaining a solid ground connection, typically tying a component’s chassis to a clean metal ground point on the airframe.

The other descriptions don’t fit the purpose: a high-resistance wire wouldn’t effectively drain static or provide a reliable ground; a flexible cable meant to carry power is for delivering voltage, not grounding; and a long tubing for fluid venting has no electrical function.