What improper operation can lead to decreased boiler efficiency?
A) Loss of oxygen in boiler feed water
B) Failing to purge firebox
C) Opening pressured header drains and vents
D) Poor control of excess air and draft control
Answer: D
Explanation: A) Incorrect. Poor control of excess air and draft control can lead to decreased boiler efficiency.
B) Incorrect. Poor control of excess air and draft control can lead to decreased boiler efficiency.
C) Incorrect. Poor control of excess air and draft control can lead to decreased boiler efficiency.
D) Correct. Poor control of excess air and draft control can lead to decreased boiler efficiency.
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