________ are usually operated manually by the use of levers, cranks, and "hook-sticks poles."

________ are usually operated manually by the use of levers, cranks, and "hook-sticks poles."

• A. Switches
• B. Disconnects
• C. Transformers
• D. Capacitors

Answer: (B)

The key idea here is how high‑voltage circuits are safely isolated for maintenance. Disconnects are isolation devices designed to physically separate a circuit from the rest of the system. They’re operated by hand, using levers or cranks, and often with a long hook-stick pole so the operator can reach and move the switch from a safe distance away from energized parts. This setup provides a visible open gap to confirm de-energization before work begins, which is a crucial safety practice in electric stations. Switches can be operated manually or remotely, but the hook-stick method and the emphasis on creating a visible, safe-open condition specifically describe disconnects. Transformers aren’t primarily operated by hand with hook-sticks, and capacitors aren’t the devices whose primary function is manual isolation with long poles. So the description points to disconnects as the correct match.

The key idea here is how high‑voltage circuits are safely isolated for maintenance. Disconnects are isolation devices designed to physically separate a circuit from the rest of the system. They’re operated by hand, using levers or cranks, and often with a long hook-stick pole so the operator can reach and move the switch from a safe distance away from energized parts. This setup provides a visible open gap to confirm de-energization before work begins, which is a crucial safety practice in electric stations.

Switches can be operated manually or remotely, but the hook-stick method and the emphasis on creating a visible, safe-open condition specifically describe disconnects. Transformers aren’t primarily operated by hand with hook-sticks, and capacitors aren’t the devices whose primary function is manual isolation with long poles. So the description points to disconnects as the correct match.