NFI Exam Study questions and answers
with solutions
Why use a gas hearth appliance?
simulation of the flame and fuel of the solid fuel fireplace or stove. Combine the convenience
and combustion efficiency of gas fuels with the aesthetics and tradition of wood burning.
What are the requirements for COMBUSTION to take place?
-Fuel - gas (natural gas or propane)
-oxygen - air
-Ignition - heat (flame, spark or hot-surface)
Section 1: Chapter 2 (2.2)
What causes incomplete combustion?
1. Missing any of combustion requirements
-ignition temperature, flammability limits, combustion ratio, heat value
2. Incorrect inputs
- main burner orifice, type of fuel, fuel pressure
3. Closing Air Shutter
Section 1 & 2: chapter 1 (1.2.2-1.2.3) & chapter 2 (2.1-2.2.1.1)
What are the results of incomplete combustion?
- Poor appliance performance
- Sooting
- Carbon Monoxide
- Aldehydes
Section 1: Chapter 1 & 2
, What are the dangers of (CO) carbon monoxide?
- colorless, tasteless, toxic, combustible gas
- exposer can cause; headaches, fatigue, nausea, dizziness, convulsions, death
- Effects can depend on; CO concentration, age, sex, health, size of victim
Section 1: Chapter 2
What causes aldehydes, what characteristics, and how is it related to carbon monoxide?
Results from:
- flame impingement
- contaminated combustion ( dust, new carpet, paint, furniture)
Characteristics; strong, pungent odor
CO relation:
- if aldehydes is present, CO is always present
- CO can be present without aldehydes
Section 1: Chapter 2
What are the characteristics of propane that you need to know?
- Propane sinks and pools
- Ignition temp. 920-1,120 degrees Fahrenheit (lower ignite than NG)
- Heat value (1 cubic foot per 2,500 BTUs)
- Small orifice, high pressure
Section 1: Chapter 1
What are the characteristics of Natural Gas you need to know?
- NG rises into atmosphere
- Ignition temp. 1,150 degrees Fahrenheit (higher than propane)
with solutions
Why use a gas hearth appliance?
simulation of the flame and fuel of the solid fuel fireplace or stove. Combine the convenience
and combustion efficiency of gas fuels with the aesthetics and tradition of wood burning.
What are the requirements for COMBUSTION to take place?
-Fuel - gas (natural gas or propane)
-oxygen - air
-Ignition - heat (flame, spark or hot-surface)
Section 1: Chapter 2 (2.2)
What causes incomplete combustion?
1. Missing any of combustion requirements
-ignition temperature, flammability limits, combustion ratio, heat value
2. Incorrect inputs
- main burner orifice, type of fuel, fuel pressure
3. Closing Air Shutter
Section 1 & 2: chapter 1 (1.2.2-1.2.3) & chapter 2 (2.1-2.2.1.1)
What are the results of incomplete combustion?
- Poor appliance performance
- Sooting
- Carbon Monoxide
- Aldehydes
Section 1: Chapter 1 & 2
, What are the dangers of (CO) carbon monoxide?
- colorless, tasteless, toxic, combustible gas
- exposer can cause; headaches, fatigue, nausea, dizziness, convulsions, death
- Effects can depend on; CO concentration, age, sex, health, size of victim
Section 1: Chapter 2
What causes aldehydes, what characteristics, and how is it related to carbon monoxide?
Results from:
- flame impingement
- contaminated combustion ( dust, new carpet, paint, furniture)
Characteristics; strong, pungent odor
CO relation:
- if aldehydes is present, CO is always present
- CO can be present without aldehydes
Section 1: Chapter 2
What are the characteristics of propane that you need to know?
- Propane sinks and pools
- Ignition temp. 920-1,120 degrees Fahrenheit (lower ignite than NG)
- Heat value (1 cubic foot per 2,500 BTUs)
- Small orifice, high pressure
Section 1: Chapter 1
What are the characteristics of Natural Gas you need to know?
- NG rises into atmosphere
- Ignition temp. 1,150 degrees Fahrenheit (higher than propane)
