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Question:
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Cast-iron head burners that had an efficiency rating of only about _______:
60%
Install the main manual gas shutoff valve on the riser at least _______ above the floor level
4 ft
70° to 90° spray angles are recommended for ________ combustion chambers:
round or square
A draft hood is used to ensure the maintenance of constant lowdraft conditions in the combustion chamber with a resultant stability of air supply
True
A yellow flame indicates dependence entirely on ______ air for combustion
secondary
The inlet of the first stage is located ________the inlet for the second stage
Above
______ on pipes and pipe fittings should be located by spreading a soap solution over the surface:
Gas leaks
A major advantage of a ________ fuel unit is that all air is eliminated from the oil being delivered to the nozzle
two-stage
Single-stage pump recommended up to a ________ vacuum:
3-inch
The burner tube of an ________ is commonly a straight, adjustable venturi that extends horizontally from the unit
inshot gas burner
The _______ is the most effective type of primary safety control used on oil burners
cadmium detection cell
The _______ air is drawn into the burner by natural draft
Secondary
In Pot type oil burners, the fuel oil is vaporized for combustion by heating it from _____
below
When the pressure gauge is attached to the nozzle line opening, it should indicate a reading of _______:
75 to 90 psi
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