MSHA Gas Detection Qualification Exam Questions and Answers
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Course
Gas Master
Institution
Gas Master
Unsafe conditions, known to any persons underground, that cannot be corrected by them in the course of their normal duties, shall be promptly reported to? - Answer-The mine foreman or direct supervisor
The supervisor to whom unsafe conditions are reported or who detects them in the course of his...
MSHA Gas Detection Qualification Exam
Questions and Answers
Unsafe conditions, known to any persons underground, that cannot be corrected by
them in the course of their normal duties, shall be promptly reported to? - Answer-The
mine foreman or direct supervisor
The supervisor to whom unsafe conditions are reported or who detects them in the
course of his duties shall be responsible for? - Answer-Seeing that they are corrected
promptly and that exposure to danger of any person is prevented except as necessary
in correcting the condition
What is the explosive range of methane? - Answer-5-15%
What is the specific gravity of methane? - Answer-.555
Methane in the working face must be maintained below? - Answer-1%
If methane is above 1% what actions must be taken? - Answer-A. Changes or
adjustments shall be made at once to the ventilation system to reduce the concentration
of methane to less than 1.0%
B. No other work shall be permitted in the affected area until the methane concentration
is less than 1%
C. When 1.5% or more methane is present in a working place or an intake air course,
including an air course in which a belt conveyor is located, or in an area where
mechanized mining equipment is being installed or removed-
1. Everyone except those persons referred to in 104 (c) of the Act shall be withdrawn
from the affected area; and
2. Except for intrinsically safe AMS, electrically powered equipment in the affected area
shall be disconnected at the power source.
Where is methane likely to accumulate in the mine? - Answer-High places, long cross
cuts, faces: section and longwall
Where do you make methane tests on the section, longwall and out by areas? -
Answer-Longwall: headgate, mid-face, tailgate, power center, pump car, battery
charger, next tailgate entry
What are the requirements for methane testing in relation to burning and welding? -
Answer-Before starting and continuously while burning and welding
How often do you make methane tests while burning/welding/cutting? - Answer-Before
starting and continuously while burning or welding,
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