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CRM-III · SAFETY QUIZ
Gas & Hydrogen Safety
Select a level and answer each question. You can revisit answers before submitting.
13 published questions
All
13
Foundation
7
Practical
3
Advanced
3
0 / 10 answered
Choose the best answer
QUESTION 01 / 10
Foundation
A gas cylinder must be moved across a repair bay. Which method is consistent with the CRM guideline?
A
Roll it along the floor on its side
B
Carry it using the regulator
C
Drag it by the valve guard
D
Move it using a suitable cylinder trolley
QUESTION 02 / 10
Foundation
Before gas cutting an oily mill area during strip-break recovery, what is the primary hazard?
A
Loss of strip thickness accuracy
B
Ignition of oil or oil-soaked material
C
Increased rolling force
D
Failure of the coil tracking barcode
QUESTION 03 / 10
Advanced
Why must a hydrogen system be checked for leaks using an approved method?
A
Hydrogen can form flammable mixtures with air
B
Hydrogen always has a strong warning smell
C
Hydrogen cannot escape small joints
D
Hydrogen is heavier than every other gas
QUESTION 04 / 10
Practical
A hydrogen–nitrogen mixed-gas line needs maintenance. What is the safest action before opening it?
A
Close a nearby hand valve and start immediately
B
Use an open flame to check whether gas remains
C
Follow approved PTW, LOTO, depressurization, purging and verification
D
Disconnect the line while the pressure gauge is still above zero
QUESTION 05 / 10
Advanced
Which statement about hydrogen–nitrogen mixed gas is technically correct?
A
Any addition of nitrogen guarantees the mixture is nonflammable
B
Mixed-gas safety depends only on the pipeline pressure
C
Nitrogen makes atmospheric monitoring unnecessary
D
Flammability depends on composition and conditions, including possible air ingress
QUESTION 06 / 10
Practical
A fixed hydrogen detector alarms near a furnace. What should a nearby employee do?
A
Ignore it if there is no smell
B
Stop work, withdraw safely, warn others and notify the control room
C
Switch off all nearby electrical switches personally
D
Search for the leak with a cigarette lighter
QUESTION 07 / 10
Foundation
Why should a suspected gas leak be reported immediately?
A
It may create fire, explosion, or exposure hazards
B
It improves process yield
C
It only affects instrument calibration
D
It changes the product label
Question reference image
QUESTION 08 / 10
Foundation
Why must hydrogen leaks be treated seriously even when no gas smell is detected?
A
Hydrogen is odourless and highly flammable
B
Hydrogen always produces a strong warning smell
C
Hydrogen cannot ignite at normal temperatures
D
Hydrogen leaks are harmless in ventilated rooms
QUESTION 09 / 10
Foundation
A compressed-air pipeline is scheduled for dismantling during a mill shutdown. Which action is specified before opening it?
A
Depressurize the pipeline
B
Disconnect the largest flange first
C
Keep the compressor running at low pressure
D
Loosen bolts until air escapes
QUESTION 10 / 10
Foundation
What is the main hazard when nitrogen or argon accumulates in an enclosed space?
A
Corrosion of all steel equipment
B
Displacement of breathable oxygen
C
Formation of visible smoke
D
Automatic generation of carbon monoxide
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