NORA STUDY GUIDE EXAM QUESTIONS
AND ANSWERS
The ignition point of fuel is? - ANSWER -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? - ANSWER -The lowest point at which fuel will flow. 17
degrees
As heating oil gets colder it's viscosity? - ANSWER -Increases
Sulfuric acid in combustion gases can? - ANSWER -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? - ANSWER -
Water
To insure clean, uncontaminated fuel reaches the oil burner? - ANSWER -Make sure to
use a clean oil filter at the tank
Water in oil tanks comes from? - ANSWER -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? - ANSWER -Fill and vent are pitched downwards,
install oil filter
Oil lines buried in concrete should be? - ANSWER -Covered copper oil line
Fuel units (oil pumps) perform the following function - ANSWER -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? - ANSWER -Flush out the lines
The key final adjustment for most oil burners is? - ANSWER -Combustion Air
Dirt or lint build-up in the bevel of the burner fan blades will? - ANSWER -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? -
ANSWER -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? - ANSWER -Allows manufacturers to
create tighter more efficient heat exchangers
One gallon of #2 fuel oil contains approximately? - ANSWER -140,000 BTU'S
All petroleum products are chemical compounds of? - ANSWER -Carbon & Hydrogen
The flash point of a fuel is an indication of? - ANSWER -The maximum temperature at
which fuel can be stored safely and handled without a serious fire hazard. 100 degrees
If the oil level in the tank is 4' below the fuel unit and 10' away the approximate vacuum
should be? - ANSWER -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? - ANSWER -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? - ANSWER -Air leak in the suction line
It is best to connect fuel units as a one-pipe system instead of two-pipe because? -
ANSWER -Two pipe systems filter the oil several times causing the filter to clog faster
A fuel de-aerator? - ANSWER -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? - ANSWER -Partially
clogged filter/strainer or an air leak
Increasing the fuel pump pressure will? - ANSWER -Increase flow rate and increase
atomization
The purpose of a oil burner nozzle is to? - ANSWER -Atomize, meter and set a spray
pattern for the fuel
When replacing a nozzle? - ANSWER -Always follow manufacturers recommendations.
Always handle carefully and touch as little as possible
To reduce combustion problems caused by cold oil? - ANSWER -Increase pump
pressure, nozzle line preheater or blend kerosine or additives with fuel
Nozzle after-drip can be caused by? - ANSWER -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? - ANSWER -100 PSI pumps
AND ANSWERS
The ignition point of fuel is? - ANSWER -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? - ANSWER -The lowest point at which fuel will flow. 17
degrees
As heating oil gets colder it's viscosity? - ANSWER -Increases
Sulfuric acid in combustion gases can? - ANSWER -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? - ANSWER -
Water
To insure clean, uncontaminated fuel reaches the oil burner? - ANSWER -Make sure to
use a clean oil filter at the tank
Water in oil tanks comes from? - ANSWER -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? - ANSWER -Fill and vent are pitched downwards,
install oil filter
Oil lines buried in concrete should be? - ANSWER -Covered copper oil line
Fuel units (oil pumps) perform the following function - ANSWER -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? - ANSWER -Flush out the lines
The key final adjustment for most oil burners is? - ANSWER -Combustion Air
Dirt or lint build-up in the bevel of the burner fan blades will? - ANSWER -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? -
ANSWER -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? - ANSWER -Allows manufacturers to
create tighter more efficient heat exchangers
One gallon of #2 fuel oil contains approximately? - ANSWER -140,000 BTU'S
All petroleum products are chemical compounds of? - ANSWER -Carbon & Hydrogen
The flash point of a fuel is an indication of? - ANSWER -The maximum temperature at
which fuel can be stored safely and handled without a serious fire hazard. 100 degrees
If the oil level in the tank is 4' below the fuel unit and 10' away the approximate vacuum
should be? - ANSWER -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? - ANSWER -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? - ANSWER -Air leak in the suction line
It is best to connect fuel units as a one-pipe system instead of two-pipe because? -
ANSWER -Two pipe systems filter the oil several times causing the filter to clog faster
A fuel de-aerator? - ANSWER -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? - ANSWER -Partially
clogged filter/strainer or an air leak
Increasing the fuel pump pressure will? - ANSWER -Increase flow rate and increase
atomization
The purpose of a oil burner nozzle is to? - ANSWER -Atomize, meter and set a spray
pattern for the fuel
When replacing a nozzle? - ANSWER -Always follow manufacturers recommendations.
Always handle carefully and touch as little as possible
To reduce combustion problems caused by cold oil? - ANSWER -Increase pump
pressure, nozzle line preheater or blend kerosine or additives with fuel
Nozzle after-drip can be caused by? - ANSWER -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? - ANSWER -100 PSI pumps
