Penna. Mine Officials' Exam Practice Tests
Gas Detection & Ventilation - Module 3

Progress Indicator:
Question 1 of 25

1.  Hydrogen sulfide has a TLV of _______ PPM and a STEL of _______ PPM.

Choices:
  1. 150 ppm, 10,000 ppm
  2. 5,000 ppm, 15,000 ppm
  3. 500 ppm, 400 ppm
  4. 10 ppm, 15 ppm

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Here's a gas chart

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