NORA TEST QUESTIONS WITH
COMPLETE SOLUTIONS
To change the air ratio for different firing rates with an adjustable head burner you? -
ANSWER -Adjust the position of the drawer assembly in the Air tube
When burned one gallon of #2 oil releases approximately? - ANSWER -140,000 BTU's
The pour point of #2 oil is? - ANSWER -The lowest temperature at which oil will flow
Sulfuric acid in combustion gasses can? - ANSWER -Create scale buildup in the heat
exchanger
Flash point of a fuel is an indication of? - ANSWER -The lowest temperature at which it
will flash but not continue to burn
As heating oil gets colder its viscosity (thickness)? - ANSWER -increases
A tank without a vent alarm - ANSWER -Should not be filled
What is the most common source of water in oil tanks? - ANSWER -condensation
The home for bacterial growth and sludge in the bottom of the oil tank is? - ANSWER -
water
Pumping the old oil from a tank being replaced into the new tank? - ANSWER -Is ok as
long as you do not pump the last 50 gallons from the tank bottom
Fuel units (oil pumps) perform the following function? - ANSWER -Move oil from the
tank to the burner and deliver it at a constant regulated pressure to the nozzle
The best way to clear a clogged oil line is to? - ANSWER -Use a hand pump to suck the
blockage out
If the oil level in the tank is 4 foot below and 10 feet away from the fuel unit and the filter
is new the approximate vacuum should be? - ANSWER -5 to 6 inches
If the operating vacuum is significantly less than the calculated vacuum you probably
have? - ANSWER -A Suction line leak
If the operating vacuum reading is significantly above the calculated vacuum you
probably have? - ANSWER -A clogged oil filter
The key final adjustment for most oil burners is - ANSWER -combustion air
, The high static air pressure created by todays oil burner - ANSWER -Enable boiler and
furnaces to have tighter more efficient heat
Dirt or lint build-up in the bevel of the burner fan blades will? - ANSWER -Reduce the
amount of combustion air
How do high pressure atomizing oil burners light oil on fire? - ANSWER -They
pressurize the oil to turn it from a liquid to droplets, mix them with air, then heat the
droplets until they vaporize then ignite
It is best to connect fuel units as a one-pipe system instead of two-pipe because? -
ANSWER -One pipe leads to longer filter life and eliminates worries about leaking return
lines
A cause of pulsating oil pump pressure and pulsating fire is? - ANSWER -Air leaks in
the suction line
A fuel de-aerator? - ANSWER -Eliminates the need for a return line back to the oil tank
The flow rate stamped on the nozzle is based on? - ANSWER -100 PSI
The purpose of an oil burner nozzle is to? - ANSWER -Atomize and meter the oil
Nozzle after drip can be caused by? - ANSWER -Thermal expansion of the oil in the
drawer assembly after shut down
To reduce combustion problems caused by cold oil? - ANSWER -Increase the pump
pressure and reduce the nozzle size
Increasing the fuel pressure pump will? - ANSWER -Increase the flow rate
A proper combustion chamber - ANSWER -Is large enough so the fire doesn't impinge
on any surface
How are draft and combustion air related? - ANSWER -As negative draft over-the- fire
increases the combustion air drawn into the burner increases
What causes thermal draft? - ANSWER -The pressure drop created by hot combustion
gasses rising in the chimney
What is affected by changes in the temperature difference between the gasses in the
chimney and the outside air, the barometric pressure, and the wind blowing over the
chimney top? - ANSWER -The draft
COMPLETE SOLUTIONS
To change the air ratio for different firing rates with an adjustable head burner you? -
ANSWER -Adjust the position of the drawer assembly in the Air tube
When burned one gallon of #2 oil releases approximately? - ANSWER -140,000 BTU's
The pour point of #2 oil is? - ANSWER -The lowest temperature at which oil will flow
Sulfuric acid in combustion gasses can? - ANSWER -Create scale buildup in the heat
exchanger
Flash point of a fuel is an indication of? - ANSWER -The lowest temperature at which it
will flash but not continue to burn
As heating oil gets colder its viscosity (thickness)? - ANSWER -increases
A tank without a vent alarm - ANSWER -Should not be filled
What is the most common source of water in oil tanks? - ANSWER -condensation
The home for bacterial growth and sludge in the bottom of the oil tank is? - ANSWER -
water
Pumping the old oil from a tank being replaced into the new tank? - ANSWER -Is ok as
long as you do not pump the last 50 gallons from the tank bottom
Fuel units (oil pumps) perform the following function? - ANSWER -Move oil from the
tank to the burner and deliver it at a constant regulated pressure to the nozzle
The best way to clear a clogged oil line is to? - ANSWER -Use a hand pump to suck the
blockage out
If the oil level in the tank is 4 foot below and 10 feet away from the fuel unit and the filter
is new the approximate vacuum should be? - ANSWER -5 to 6 inches
If the operating vacuum is significantly less than the calculated vacuum you probably
have? - ANSWER -A Suction line leak
If the operating vacuum reading is significantly above the calculated vacuum you
probably have? - ANSWER -A clogged oil filter
The key final adjustment for most oil burners is - ANSWER -combustion air
, The high static air pressure created by todays oil burner - ANSWER -Enable boiler and
furnaces to have tighter more efficient heat
Dirt or lint build-up in the bevel of the burner fan blades will? - ANSWER -Reduce the
amount of combustion air
How do high pressure atomizing oil burners light oil on fire? - ANSWER -They
pressurize the oil to turn it from a liquid to droplets, mix them with air, then heat the
droplets until they vaporize then ignite
It is best to connect fuel units as a one-pipe system instead of two-pipe because? -
ANSWER -One pipe leads to longer filter life and eliminates worries about leaking return
lines
A cause of pulsating oil pump pressure and pulsating fire is? - ANSWER -Air leaks in
the suction line
A fuel de-aerator? - ANSWER -Eliminates the need for a return line back to the oil tank
The flow rate stamped on the nozzle is based on? - ANSWER -100 PSI
The purpose of an oil burner nozzle is to? - ANSWER -Atomize and meter the oil
Nozzle after drip can be caused by? - ANSWER -Thermal expansion of the oil in the
drawer assembly after shut down
To reduce combustion problems caused by cold oil? - ANSWER -Increase the pump
pressure and reduce the nozzle size
Increasing the fuel pressure pump will? - ANSWER -Increase the flow rate
A proper combustion chamber - ANSWER -Is large enough so the fire doesn't impinge
on any surface
How are draft and combustion air related? - ANSWER -As negative draft over-the- fire
increases the combustion air drawn into the burner increases
What causes thermal draft? - ANSWER -The pressure drop created by hot combustion
gasses rising in the chimney
What is affected by changes in the temperature difference between the gasses in the
chimney and the outside air, the barometric pressure, and the wind blowing over the
chimney top? - ANSWER -The draft
