The purpose of a 'peep' hole in the boiler casing is to __________.
Official USCG Answer & Rule Citation
Correct Answer: Option D — examine the condition of the flame
In USCG Steam Plants (Boilers & Turbines), regarding 'The purpose of a 'peep' hole in the boiler casing is to', the verified engineering fact is: 'examine the condition of the flame'.
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