Prior to performing any internal maintenance...

Question 1 / 270705eccefa4bacbc34ba4d484f3

Question 1 of 270705eccefa4bacbc34ba4d484f3

Prior to performing any internal maintenance on a large DC main propulsion motor, what precaution or precautions should be taken? De-energize, lock-out, and tag-out the motor electrically Engage the shaft brake

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Question 1 of 27070

🔍 Key Concepts

• Lock-out/Tag-out (LOTO) safety procedures for electrical equipment • Mechanical hazards from rotating machinery and stored energy (e.g., shaft movement) • Differences between electrical isolation and mechanical securing of equipment

💭 Think About

• If you are going to work inside a large DC propulsion motor, what are the worst things that could happen electrically and mechanically? • Which listed steps directly prevent accidental energizing of the motor, and which prevent unexpected movement of the shaft or rotor? • Is a single type of protection (only electrical or only mechanical) enough for safe internal work, or are multiple forms of isolation typically required?

✅ Before You Answer

• Verify which statement(s) deal with electrical isolation and preventing re‑energization of the motor • Verify which statement(s) address preventing unintended rotation or movement of the propulsion shaft • Consider standard marine and industrial practice: for internal maintenance on major propulsion equipment, is both electrical and mechanical isolation generally required, or just one?

Question 1 of 27070

I only

II only

Both I and II

Neither I nor II

Question 1 / 270705eccefa4bacbc34ba4d484f3

Question 1 of 270705eccefa4bacbc34ba4d484f3

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Question 1 of 27070