Single-stage pump recommended up to a ________ vacuum:

The hollow cone pattern of spray in oil burner nozzle is recommended for use in _______ burner:

A major advantage of a ________ fuel unit is that all air is eliminated from the oil being delivered to the nozzle

Nozzles producing solid cone pattern are particularly recommended for smoother ignition in oil burners firing above 2.00 or 3.00 gph

70° to 90° spray angles are recommended for ________ combustion chambers:

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

Excessive draft can _______ the percentage of carbon dioxide in the flue gases

An efficient oil burner is one that burns the fuel oil completely using the ______ amount of air necessary for combustion.

The _______ is the difference between the temperature of the flue gases inside the pipe and the room air temperature outside

The inlet of the first stage is located ________the inlet for the second stage

This type of transformer is designed to increase the voltage of  _______ required to ignite the fuel oil.

Cast-iron head burners that had an efficiency rating of only about _______:

In Pot type oil burners, the fuel oil is vaporized for combustion by heating it from _____

Which of the following atomizes the fuel oil

The fuel oil first enters the unit by passing through the _______, where foreign particles such as dirt and line filter fibers are removed.