2025 NORA STUDY GUIDE 100
QUESTIONS WITH VERIFIED
ANSWERS
The key final adjustment for most oil burners is? - CORRECT ANSWER>>>>Combustion Air
Dirt or lint build-up in the bevel of the burner fan blades will? - CORRECT
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? - CORRECT
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? - CORRECT ANSWER>>>>Allows
manufacturers to create tighter more efficient heat exchangers
One gallon of #2 fuel oil contains approximately? - CORRECT ANSWER>>>>140,000 BTU'S
All petroleum products are chemical compounds of? - CORRECT ANSWER>>>>Carbon &
Hydrogen
The flash point of a fuel is an indication of? - CORRECT ANSWER>>>>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? - CORRECT 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? - CORRECT ANSWER>>>>The lowest point at which fuel will
flow. 17 degrees
As heating oil gets colder it's viscosity? - CORRECT ANSWER>>>>Increases
Sulfuric acid in combustion gases can? - CORRECT 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? - CORRECT
ANSWER>>>>Water
To insure clean, uncontaminated fuel reaches the oil burner? - CORRECT ANSWER>>>>Make
sure to use a clean oil filter at the tank
, Water in oil tanks comes from? - CORRECT 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? - CORRECT ANSWER>>>>Fill and vent are pitched
downwards, install oil filter
Oil lines buried in concrete should be? - CORRECT ANSWER>>>>Covered copper oil line
Fuel units (oil pumps) perform the following function - CORRECT 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? - CORRECT ANSWER>>>>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? - CORRECT 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? - CORRECT 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? -
CORRECT ANSWER>>>>Air leak in the suction line
It is best to connect fuel units as a one-pipe system instead of two-pipe because? - CORRECT
ANSWER>>>>Two pipe systems filter the oil several times causing the filter to clog faster
A fuel de-aerator? - CORRECT 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? - CORRECT
ANSWER>>>>Partially clogged filter/strainer or an air leak
Increasing the fuel pump pressure will? - CORRECT ANSWER>>>>Increase flow rate and
increase atomization
The purpose of a oil burner nozzle is to? - CORRECT ANSWER>>>>Atomize, meter and set a
spray pattern for the fuel
When replacing a nozzle? - CORRECT ANSWER>>>>Always follow manufacturers
recommendations. Always handle carefully and touch as little as possible
To reduce combustion problems caused by cold oil? - CORRECT ANSWER>>>>Increase pump
pressure, nozzle line preheater or blend kerosine or additives with fuel
QUESTIONS WITH VERIFIED
ANSWERS
The key final adjustment for most oil burners is? - CORRECT ANSWER>>>>Combustion Air
Dirt or lint build-up in the bevel of the burner fan blades will? - CORRECT
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? - CORRECT
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? - CORRECT ANSWER>>>>Allows
manufacturers to create tighter more efficient heat exchangers
One gallon of #2 fuel oil contains approximately? - CORRECT ANSWER>>>>140,000 BTU'S
All petroleum products are chemical compounds of? - CORRECT ANSWER>>>>Carbon &
Hydrogen
The flash point of a fuel is an indication of? - CORRECT ANSWER>>>>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? - CORRECT 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? - CORRECT ANSWER>>>>The lowest point at which fuel will
flow. 17 degrees
As heating oil gets colder it's viscosity? - CORRECT ANSWER>>>>Increases
Sulfuric acid in combustion gases can? - CORRECT 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? - CORRECT
ANSWER>>>>Water
To insure clean, uncontaminated fuel reaches the oil burner? - CORRECT ANSWER>>>>Make
sure to use a clean oil filter at the tank
, Water in oil tanks comes from? - CORRECT 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? - CORRECT ANSWER>>>>Fill and vent are pitched
downwards, install oil filter
Oil lines buried in concrete should be? - CORRECT ANSWER>>>>Covered copper oil line
Fuel units (oil pumps) perform the following function - CORRECT 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? - CORRECT ANSWER>>>>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? - CORRECT 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? - CORRECT 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? -
CORRECT ANSWER>>>>Air leak in the suction line
It is best to connect fuel units as a one-pipe system instead of two-pipe because? - CORRECT
ANSWER>>>>Two pipe systems filter the oil several times causing the filter to clog faster
A fuel de-aerator? - CORRECT 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? - CORRECT
ANSWER>>>>Partially clogged filter/strainer or an air leak
Increasing the fuel pump pressure will? - CORRECT ANSWER>>>>Increase flow rate and
increase atomization
The purpose of a oil burner nozzle is to? - CORRECT ANSWER>>>>Atomize, meter and set a
spray pattern for the fuel
When replacing a nozzle? - CORRECT ANSWER>>>>Always follow manufacturers
recommendations. Always handle carefully and touch as little as possible
To reduce combustion problems caused by cold oil? - CORRECT ANSWER>>>>Increase pump
pressure, nozzle line preheater or blend kerosine or additives with fuel
