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Authorized Gas Tester & Atmospheric Monitoring

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Introduction_to_Gas_Testing_TWSA

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1. Which of the following gases is flammable?
Methane (CH₄) Nitrogen (N₂) Carbon Dioxide (CO₂)
2. What is the safe minimum oxygen level allowed for workers?
18% 19.5% 25%
3. What is the Upper Explosive Limit (UEL)?
The highest gas concentration that can ignite The amount of gas in a cylinder The temperature limit for hot work
4. Why is gas testing essential before hot work?
To save time To ensure no flammable atmosphere is present To protect equipment only
5. What does a Permit-to-Work (PTW) system rely on?
Accurate gas test results Worker experience only Equipment manuals
6. Which gas is often called the “silent killer” due to its lack of smell and color?
Carbon Monoxide (CO) Oxygen (O₂) Nitrogen (N₂)
7. Which factor affects gas behavior in confined spaces?
Gas density Worker’s age Equipment type
8. What is the main limitation of gas testing?
It only measures conditions at the test location It takes too long It requires electricity
9. What type of detector is commonly used for hydrogen sulfide (H₂S)?
Electrochemical sensor Photoionization detector Thermometer
10. What is the ultimate goal of gas testing?
To comply with paperwork To protect lives and prevent accidents To extend equipment life