The following listed are some factors on which boiler efficiency depends. Which of the following is a variable factor?

The following listed are some factors on which boiler efficiency depen

1.	The following listed are some factors on which boiler efficiency depends. Which of the following is a variable factor?
A.	Excess air fluctuations
B.	Rated rate of firing
C.	Boiler design
D.	Heat recovery equipment
Answer» B. Rated rate of firing

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The following listed are some factors on which boiler efficiency depends. Which of the following is a variable factor?

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