AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

Access More Questions

A monitor in an underground work area or the air return reaches 20 percent or more of the LEL. What must happen immediately?

Continue mining but issue extra dust masks Only suspend welding if it is already in progress, and keep all other power on Withdraw employees to a safe location above ground and cut electrical power except acceptable pumping and ventilation until the concentration is below 20 percent of the LEL Increase only the muck-train speed to clear the heading

Correct Answer:

Withdraw employees to a safe location above ground and cut electrical power except acceptable pumping and ventilation until the concentration is below 20 percent of the LEL

Access more questions from this quiz

Continue to AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam for more practice questions and the full quiz experience.

Access More Questions