NORA Study Guide Questions With 100% Correct
Answers.
The key final adjustment for most oil burners is?
Combustion Air
Dirt or lint build-up in the bevel of the burner fan blades will?
Reduce the blade bevel and reduce the amount of air delivered
To change the air ratio for different firing rates with an adjustable head burner
you?
Move the head forward or backward, against or away from the ring closing or opening
the tertiary slot
One advantage of high static pressure burners is?
Allows manufacturers to create tighter more efficient heat exchangers
One gallon of #2 fuel oil contains approximately?
140,000 BTU'S
All petroleum products are chemical compounds of?
Carbon & Hydrogen
The flash point of a fuel is an indication of?
The maximum temperature at which fuel can be stored safely and handled without a
serious fire hazard. 100 degrees
The ignition point of fuel is?
The lowest temperature at which rapid combustion of a fuel will take place. The point at
which all fuel has been heated and vaporized. 500 degrees
The pour point of #2 oil is?
The lowest point at which fuel will flow. 17 degrees
As heating oil gets colder it's viscosity?
Increases
Sulfuric acid in combustion gases can?
Create Sulfuric Trioxide which can react with the water vapor in the combustion gases
to create a sulfuric acid aerosol which will scale up the heat exchanger
The home for bacterial growth and sludge in the bottom of the oil tank is?
Water
To insure clean, uncontaminated fuel reaches the oil burner?
Make sure to use a clean oil filter at the tank
Water in oil tanks comes from?
Condensation, broken tank gauge, loose vent or fill fittings or missing caps, pumping old
oil into new tank
When installing an oil tank be sure?
Fill and vent are pitched downwards, install oil filter
Oil lines buried in concrete should be?
Covered copper oil line
Fuel units (oil pumps) perform the following function
Draw oil from the tank to the burner and pressurize the oil to 100 PSI or greater
The best way to clear a clogged oil line is to?
Flush out the lines
, If the oil level in the tank is 4' below the fuel unit and 10' away the approximate
vacuum should be?
5" of vacuum 1" for every 1' rise plus 1" for every 10' run
If the operating vacuum reading is significantly above the calculated vacuum you
probably have a?
Plugged fuel filter, kinked oil supply line or a partially closed oil supply valve
If the operating vacuum is significantly less then the calculated vacuum you
probably have a?
Air leak in the suction line
It is best to connect fuel units as a one-pipe system instead of two-pipe because?
Two pipe systems filter the oil several times causing the filter to clog faster
A fuel de-aerator?
Reduces air in oil by eliminating the need for a 2 pipe system
A cause of pulsating oil pump pressure and a pulsating fire is?
Partially clogged filter/strainer or an air leak
Increasing the fuel pump pressure will?
Increase flow rate and increase atomization
The purpose of a oil burner nozzle is to?
Atomize, meter and set a spray pattern for the fuel
When replacing a nozzle?
Always follow manufacturers recommendations. Always handle carefully and touch as
little as possible
To reduce combustion problems caused by cold oil?
Increase pump pressure, nozzle line preheater or blend kerosine or additives with fuel
Nozzle after-drip can be caused by?
A defective pump shutoff valve, air entrapped in nozzle line, oil expansion in nozzle
caused by exsessive radiant heat
The flow rate stamped on the nozzle is based on?
100 PSI pumps
A proper combustion chamber?
Must be made of the proper material and properly sized
Too much draft over the fire can occur when?
The draft regulator is sealed shut
Thermal draft is created by?
The air in the chimney being hotter then the air outside
Chimney draft is affected by?
Outside temperature, humidity, wind
At steady state we find a typical draft of -.01 to -.02" of water column....
Over the fire
Excessive draft drop through the heat exchanger indicates?
Heavy soot and scale deposit. Dirty heat exchanger
When the combustion gasses get too cold?
Water vapor in flue gasses will condense back into water
Power venters use?
A fan to pull combustion gasses through the heat exchanger and out of the building
About 21% of air is made up of?
Answers.
The key final adjustment for most oil burners is?
Combustion Air
Dirt or lint build-up in the bevel of the burner fan blades will?
Reduce the blade bevel and reduce the amount of air delivered
To change the air ratio for different firing rates with an adjustable head burner
you?
Move the head forward or backward, against or away from the ring closing or opening
the tertiary slot
One advantage of high static pressure burners is?
Allows manufacturers to create tighter more efficient heat exchangers
One gallon of #2 fuel oil contains approximately?
140,000 BTU'S
All petroleum products are chemical compounds of?
Carbon & Hydrogen
The flash point of a fuel is an indication of?
The maximum temperature at which fuel can be stored safely and handled without a
serious fire hazard. 100 degrees
The ignition point of fuel is?
The lowest temperature at which rapid combustion of a fuel will take place. The point at
which all fuel has been heated and vaporized. 500 degrees
The pour point of #2 oil is?
The lowest point at which fuel will flow. 17 degrees
As heating oil gets colder it's viscosity?
Increases
Sulfuric acid in combustion gases can?
Create Sulfuric Trioxide which can react with the water vapor in the combustion gases
to create a sulfuric acid aerosol which will scale up the heat exchanger
The home for bacterial growth and sludge in the bottom of the oil tank is?
Water
To insure clean, uncontaminated fuel reaches the oil burner?
Make sure to use a clean oil filter at the tank
Water in oil tanks comes from?
Condensation, broken tank gauge, loose vent or fill fittings or missing caps, pumping old
oil into new tank
When installing an oil tank be sure?
Fill and vent are pitched downwards, install oil filter
Oil lines buried in concrete should be?
Covered copper oil line
Fuel units (oil pumps) perform the following function
Draw oil from the tank to the burner and pressurize the oil to 100 PSI or greater
The best way to clear a clogged oil line is to?
Flush out the lines
, If the oil level in the tank is 4' below the fuel unit and 10' away the approximate
vacuum should be?
5" of vacuum 1" for every 1' rise plus 1" for every 10' run
If the operating vacuum reading is significantly above the calculated vacuum you
probably have a?
Plugged fuel filter, kinked oil supply line or a partially closed oil supply valve
If the operating vacuum is significantly less then the calculated vacuum you
probably have a?
Air leak in the suction line
It is best to connect fuel units as a one-pipe system instead of two-pipe because?
Two pipe systems filter the oil several times causing the filter to clog faster
A fuel de-aerator?
Reduces air in oil by eliminating the need for a 2 pipe system
A cause of pulsating oil pump pressure and a pulsating fire is?
Partially clogged filter/strainer or an air leak
Increasing the fuel pump pressure will?
Increase flow rate and increase atomization
The purpose of a oil burner nozzle is to?
Atomize, meter and set a spray pattern for the fuel
When replacing a nozzle?
Always follow manufacturers recommendations. Always handle carefully and touch as
little as possible
To reduce combustion problems caused by cold oil?
Increase pump pressure, nozzle line preheater or blend kerosine or additives with fuel
Nozzle after-drip can be caused by?
A defective pump shutoff valve, air entrapped in nozzle line, oil expansion in nozzle
caused by exsessive radiant heat
The flow rate stamped on the nozzle is based on?
100 PSI pumps
A proper combustion chamber?
Must be made of the proper material and properly sized
Too much draft over the fire can occur when?
The draft regulator is sealed shut
Thermal draft is created by?
The air in the chimney being hotter then the air outside
Chimney draft is affected by?
Outside temperature, humidity, wind
At steady state we find a typical draft of -.01 to -.02" of water column....
Over the fire
Excessive draft drop through the heat exchanger indicates?
Heavy soot and scale deposit. Dirty heat exchanger
When the combustion gasses get too cold?
Water vapor in flue gasses will condense back into water
Power venters use?
A fan to pull combustion gasses through the heat exchanger and out of the building
About 21% of air is made up of?
