MSHA Mine Safety And Health Certification Exam

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A team is advancing in an entry and is stopped by an unsafe roof. There is a gas placard 10 feet out by the unsafe roof. The other entries are blocked, but the team has timbers. If the team timbers through the unsafe roof, does the gas extend through the unsafe roof?

Yes, the gas extends through the unsafe roof regardless of the presence of a placard. Yes, the gas extends through the unsafe roof if there are other entries blocked. No, the gas does not extend through the unsafe roof if there was no placard indicating its presence. No, the gas does not extend through the unsafe roof if the team has timbers to secure it.

Correct Answer:

No, the gas does not extend through the unsafe roof if there was no placard indicating its presence.

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