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Nora Certification Exam/100 Questions and answers
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Nora Certification Exam/100 Questions and answers
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Nora Certification Exam/100Questions and answers
The final adjustment for most oil burners is? - -Combustion air
- Dirt or lint build-up in the bevel of the fan blades will: - -Reduce the
amount of combustion air.
- To change the air ratio for different firing rates with an adjustable head
burner you: - -Adjust the position of the draw assembly in the air tube.
- One advantage of a high pressure burner is: - -They enable boiler
manufacturers to design tighter more efficient heat exchangers.
- One gallon of #2 oil contains approximately: - -140,000 British Thermal
Unit's (BTU's)
- All petroleum products are chemical compounds of what two atom's? - -
Carbon and Hydrogen
- Flash point of a fuel is an indication of: - -The lowest temperature at which
the fuel will flash but not continue to burn.
- The ignition point is: - -The lowest temperature at which rapid combustion
of the fuel takes place in air.
- The pour point of #2 oil: - -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): - -Increases (Thicker
consistency)
- Sulfuric acid in combustion gasses can: - -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: -
-Water.
- To insure clean uncontaminated fuel reaches the oil burner: - -Install a
quality filter.
- Water in oil tanks come from: - -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: - -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: - -Sleeved in plastic or PVC pipe
with no fittings below the floor.
- Fuel Units (oil pumps) perform the following functions: - -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: - -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: - -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: - -Clogged oil filter.
- If the operating vacuum is significantly less than the calculated vacuum
you probably have: - -Suction line leak.
- It is best to connect fuel units as a one-pipe system instead of a two-pipe
system because: - -One pipe leaders to longer filter life and eliminates
worries about leaking return lines.
- A fuel de-aerator: - -Eliminates the need for a return line back to the tank.
- A cause of pulsating oil pump pressure and pulsating fire is: - -Air leaks in
the Suction line.
- Increasing the fuel pump pressure will: - -Increase the flow rate.
- The purpose of an oil burner nozzle is to: - -1. Atomize the oil,
2. Provide a Spray Pattern,
3. Meter the amount of oil burned.
- When replacing a nozzle: - -Follow the manufacturers recommendations.
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