The temperature at which wax crystals begin to form in oil is ______

The common spark gap between two electrode tips will be about:

Nozzles are rated in ________:

The resistance of clad cell should be around _____ ohms or more when sensing darkness:

Which one of the following installed in the flue of an oil fired pump used to control draft through the chimney:

A high smoke reading indicates there is ______ amount of combustion air available:

______ reading refers to the draft within the chimney piping:

When there is an increase in the primary air, which of the following is not correct:

Inorder to produce a spark between the two electrodes _____ voltage is required to be provide between the electrodes:

_______ is caused by the accumulation of fuel oil in the combustion chamber of the furnace or boiler after an ignition failure.

The angle selected for oil spray will depend on which of the following:

When the carbon dioxide (CO2) content of the flue gas is too low (less than 8 percent), heat is lost up the chimney:

The _______ limit of the firing rate of a flame-retention head burner is governed by the flue gas temperature leaving the furnace or boiler:

A correct draft is essential for efficient burner operation

Which of the fuel oil  gives more heat per gallon used.