NORA CERTIFICATION EXAM
QUESTIONS AND ANSWERS
The ignition point is: - ANSWER -The lowest temperature at which rapid combustion of
the fuel takes place in air.
The pour point of #2 oil: - ANSWER -1. Can be lowered by blending with kerosene,
2. Can be lowered with fuel additives,
3. Is the lowest temperature at which oil will flow.
As heating oil gets colder its viscosity (thickness): - ANSWER -Increases (Thicker
consistency)
Sulfuric acid in combustion gasses can: - ANSWER -1. Damage the flue liner,
2. Eat holes in the flue pipe,
3. Create scale buildup in the heat exchanger.
The home for bacteria growth and sludge in the bottom of the oil tank is: - ANSWER -
Water.
To insure clean uncontaminated fuel reaches the oil burner: - ANSWER -Install a quality
filter.
Water in oil tanks come from: - ANSWER -1. Condensation,
2. loose or missing fill vent cap,
3. failing to drain water from tank before install.
When installing an oil tank be sure: - ANSWER -1. Fill vents are pitched downwards
forward the tank,
2. To install a vent alarm and tank gauge,
3. To install an oil filter.
Oil lines buried in concrete should be: - ANSWER -Sleeved in plastic or PVC pipe with
no fittings below the floor.
Fuel Units (oil pumps) perform the following functions: - ANSWER -Lift oil from the tank
to the burner, Prevent contaminants that pass the external oil filter from clogging the
nozzle, Deliver oil 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 pull the
blockage out.
If the oil level in the tank is 4 foot below the fuel unit and 10 feet away the approximate
vacuums should be: - ANSWER -5-6 inches (1'' for every vertical foot , 1'' for every 10').
, If the operating vacuum reading is significantly above the calculated vacuum you
probably have a: - ANSWER -Clogged oil filter.
If the operating vacuum is significantly less than the calculated vacuum you probably
have: - ANSWER -Suction line leak.
The final adjustment for most oil burners is? - ANSWER -Combustion air
Dirt or lint build-up in the bevel of the fan blades will: - ANSWER -Reduce the amount of
combustion air.
To change the air ratio for different firing rates with an adjustable head burner you: -
ANSWER -Adjust the position of the draw assembly in the air tube.
One advantage of a high pressure burner is: - ANSWER -They enable boiler
manufacturers to design tighter more efficient heat exchangers.
One gallon of #2 oil contains approximately: - ANSWER -140,000 British Thermal Unit's
(BTU's)
All petroleum products are chemical compounds of what two atom's? - ANSWER -
Carbon and Hydrogen
Flash point of a fuel is an indication of: - ANSWER -The lowest temperature at which
the fuel will flash but not continue to burn.
It is best to connect fuel units as a one-pipe system instead of a two-pipe system
because: - ANSWER -One pipe leaders to longer filter life and eliminates worries about
leaking return lines.
A fuel de-aerator: - ANSWER -Eliminates the need for a return line back to the tank.
A cause of pulsating oil pump pressure and pulsating fire is: - ANSWER -Air leaks in the
Suction line.
Increasing the fuel pump pressure will: - ANSWER -Increase the flow rate.
The purpose of an oil burner nozzle is to: - ANSWER -1. Atomize the oil,
2. Provide a Spray Pattern,
3. Meter the amount of oil burned.
When replacing a nozzle: - ANSWER -Follow the manufacturers recommendations.
To reduce combustion problems caused by cold oil: - ANSWER -Increase pump
pressure, Install a nozzle line pre-heater, Use additives or kerosene to lower viscosity.
QUESTIONS AND ANSWERS
The ignition point is: - ANSWER -The lowest temperature at which rapid combustion of
the fuel takes place in air.
The pour point of #2 oil: - ANSWER -1. Can be lowered by blending with kerosene,
2. Can be lowered with fuel additives,
3. Is the lowest temperature at which oil will flow.
As heating oil gets colder its viscosity (thickness): - ANSWER -Increases (Thicker
consistency)
Sulfuric acid in combustion gasses can: - ANSWER -1. Damage the flue liner,
2. Eat holes in the flue pipe,
3. Create scale buildup in the heat exchanger.
The home for bacteria growth and sludge in the bottom of the oil tank is: - ANSWER -
Water.
To insure clean uncontaminated fuel reaches the oil burner: - ANSWER -Install a quality
filter.
Water in oil tanks come from: - ANSWER -1. Condensation,
2. loose or missing fill vent cap,
3. failing to drain water from tank before install.
When installing an oil tank be sure: - ANSWER -1. Fill vents are pitched downwards
forward the tank,
2. To install a vent alarm and tank gauge,
3. To install an oil filter.
Oil lines buried in concrete should be: - ANSWER -Sleeved in plastic or PVC pipe with
no fittings below the floor.
Fuel Units (oil pumps) perform the following functions: - ANSWER -Lift oil from the tank
to the burner, Prevent contaminants that pass the external oil filter from clogging the
nozzle, Deliver oil 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 pull the
blockage out.
If the oil level in the tank is 4 foot below the fuel unit and 10 feet away the approximate
vacuums should be: - ANSWER -5-6 inches (1'' for every vertical foot , 1'' for every 10').
, If the operating vacuum reading is significantly above the calculated vacuum you
probably have a: - ANSWER -Clogged oil filter.
If the operating vacuum is significantly less than the calculated vacuum you probably
have: - ANSWER -Suction line leak.
The final adjustment for most oil burners is? - ANSWER -Combustion air
Dirt or lint build-up in the bevel of the fan blades will: - ANSWER -Reduce the amount of
combustion air.
To change the air ratio for different firing rates with an adjustable head burner you: -
ANSWER -Adjust the position of the draw assembly in the air tube.
One advantage of a high pressure burner is: - ANSWER -They enable boiler
manufacturers to design tighter more efficient heat exchangers.
One gallon of #2 oil contains approximately: - ANSWER -140,000 British Thermal Unit's
(BTU's)
All petroleum products are chemical compounds of what two atom's? - ANSWER -
Carbon and Hydrogen
Flash point of a fuel is an indication of: - ANSWER -The lowest temperature at which
the fuel will flash but not continue to burn.
It is best to connect fuel units as a one-pipe system instead of a two-pipe system
because: - ANSWER -One pipe leaders to longer filter life and eliminates worries about
leaking return lines.
A fuel de-aerator: - ANSWER -Eliminates the need for a return line back to the tank.
A cause of pulsating oil pump pressure and pulsating fire is: - ANSWER -Air leaks in the
Suction line.
Increasing the fuel pump pressure will: - ANSWER -Increase the flow rate.
The purpose of an oil burner nozzle is to: - ANSWER -1. Atomize the oil,
2. Provide a Spray Pattern,
3. Meter the amount of oil burned.
When replacing a nozzle: - ANSWER -Follow the manufacturers recommendations.
To reduce combustion problems caused by cold oil: - ANSWER -Increase pump
pressure, Install a nozzle line pre-heater, Use additives or kerosene to lower viscosity.
