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An efficient oil burner is one that burns the fuel oil completely using the ______ amount of air necessary for combustion.
Soldered or sweated connections are also not recommended in ________:
both options are correct
Flame test can be carried out inorder to identify the leaks in the gas piping:
For radiant floor heat, hot water temperature can be much higher than for space heating:
Smoky combustion indicates poor burner performance
The common spark gap between two electrode tips will be about:
For the most efficient operating characteristics, the overfire draft generally should be not less than _______:
0.02 inch wg
In two stage oil pump the _______ stage draws completely air-free oil:
Excessive draft can _______ the percentage of carbon dioxide in the flue gases
Which of the following gas is lighter than air:
_______ fuel spray angles are recommended for long, narrow chambers
30° to 60°
______ gives a twisting motion to the air stream just before it strikes the oil spray
No.2 fuel oil has a heating value of about ______ btu per gallon:
The fuel oil first enters the unit by passing through the _______, where foreign particles such as dirt and line filter fibers are removed.