USCG USCG Steam
Set 11 • Question #88 of 496
Launch Interactive Practice Room The turndown ratio an automatic combustion control system is the ratio __________.
A
of air to fuel for a given firing rate
B
of forced draft fan speed to feedwater flow
C
between the highest and lowest oil pressure at which the burner will remain lit
✓ Correct Answer
D
between fuel oil pressure and atomizing steam pressure at a given firing rate
USCG NMC Regulatory Explanation
In USCG Steam Plants (Boilers & Turbines), regarding 'The turndown ratio an automatic combustion control system is the ratio', the verified engineering fact is: 'between the highest and lowest oil pressure at which the burner will remain lit'.
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