Smoky combustion indicates poor burner performance

For the most efficient operating characteristics, the overfire draft generally should be not less than _______:

Which of the following nozzle fuel spray type is recommended where long fires are required or where the air pattern or the oil burner is heavy in the center:

_______ fuel spray angles are recommended for long, narrow chambers

The _______ is the most effective type of primary safety control used on oil burners

Oil burner nozzles are selected on the basis of the spray angle they produce

Which of the following are both used to service a fuel unit:

When the pressure gauge is attached to the nozzle line opening, it should indicate a reading of _______:

In which of the following fuel spray pattern is little or no distribution of droplets in the center of the cone:

The existence of air leaks in the supply line can be determined by _______ readings once the gauge is attached to the optional inlet connection

The efficiency of these cast-iron head burners can be increased by _______ the firing rate.

The fuel pump is used to draw fuel oil from the storage tank and deliver it under high pressure of about ________ to the nozzle assembly:

Which of the fuel pumps are used with underground fuel tank applications:

No.2 fuel oil has a heating value of about ______ btu per gallon:

Which of the following are not a product of combustion: