NATE Gas questions TESTS WITH ANSWERS A+ GRADE.
The complaint is that there is static electricity throughout the house. The home has a bypass humidifier.
The technician has checked the humidistat and verified that it is set properly.
What would the technician check next? - Check that the humidifier damper is open
A line voltage fuse is sized to - protect from excessive voltage
14. With a non-direct vented furnace located in a basement, what are the requirements for the space to
qualify as an "unconfined space"? - At least 50 ft of air volume for every
1000 Btu/h capacity of ail combustion appliances in the space
When troubleshooting a blower motor cir on a packaged system, 244V is measured across the motor and
no amperage is measured. What is a likely problem with this system? - An internal overload device is
open
If too much primary air is used on a ribbon burner, the flame will - lift off the burner
What is an industry accepted method for locating a suspected natural gas leak? - a soap solution
The first check made for most electrical troubleshooting is a - voltage check of the supply line
Which ACCA manual should the technician consult to make accurate residential load calculations? -
Manual J
Drive cleats are typically installed where on rectangular duct? - on the shorter sides
What is a likely problem if a gas furnace has a temperature differential across the heat exchanger which
exceeds the value on the manufacturer's rating plate? - Inadequate system airflow
A typical four-way multipositional gas furnace is converted from upflow to downflow by - turning the
furnace upside down with specified alterations
, What is the relationship between inrush current and holding current of the relay coil? - Inrush current is
always greater than holding current
A furnace using an integrated control board is blowing cold air at the end of the cycle. What is the likely
problem with this system? - The blower off delay is set too long
The outdoor winter temperature for which a gas furnace is to be sized is called the out design temperature.
The tables for winter outdoor design temperatures are measured by - dry bulb temperature only
Before starting a gas furnace after its installation, the technician should do a visual check of all wiring on
the equipment. What must be included with these checks? - A check that all connections are secure and
tight
How long should a gas furnace operate before a combustion test is taken? - After the gas furnace has
reached steady state
Aluminized steel heat exchangers are coated to prevent - rusting of the heat exchanger
Bent hands on a direct drive blower wheel in a gas furnace can cause - cutout on high limit, excessive
blower moto wear, and reduced motor torque
A dirty or clogged air filter in an operating heat pump system can cause - an increased temperature rise
Condensing furnaces take advantage of what additional form of heat contained in the flue gases? - latent
heat
How should a technician evaluate the circuitry on a residential gas furnace when the wiring diagram is
missing? - Draw the circuits on a notepad
You are responding to a report of "drafty air" in a room during the heating season.
The following conditions exist:
*Discharge air velocity 815 fpm,
The complaint is that there is static electricity throughout the house. The home has a bypass humidifier.
The technician has checked the humidistat and verified that it is set properly.
What would the technician check next? - Check that the humidifier damper is open
A line voltage fuse is sized to - protect from excessive voltage
14. With a non-direct vented furnace located in a basement, what are the requirements for the space to
qualify as an "unconfined space"? - At least 50 ft of air volume for every
1000 Btu/h capacity of ail combustion appliances in the space
When troubleshooting a blower motor cir on a packaged system, 244V is measured across the motor and
no amperage is measured. What is a likely problem with this system? - An internal overload device is
open
If too much primary air is used on a ribbon burner, the flame will - lift off the burner
What is an industry accepted method for locating a suspected natural gas leak? - a soap solution
The first check made for most electrical troubleshooting is a - voltage check of the supply line
Which ACCA manual should the technician consult to make accurate residential load calculations? -
Manual J
Drive cleats are typically installed where on rectangular duct? - on the shorter sides
What is a likely problem if a gas furnace has a temperature differential across the heat exchanger which
exceeds the value on the manufacturer's rating plate? - Inadequate system airflow
A typical four-way multipositional gas furnace is converted from upflow to downflow by - turning the
furnace upside down with specified alterations
, What is the relationship between inrush current and holding current of the relay coil? - Inrush current is
always greater than holding current
A furnace using an integrated control board is blowing cold air at the end of the cycle. What is the likely
problem with this system? - The blower off delay is set too long
The outdoor winter temperature for which a gas furnace is to be sized is called the out design temperature.
The tables for winter outdoor design temperatures are measured by - dry bulb temperature only
Before starting a gas furnace after its installation, the technician should do a visual check of all wiring on
the equipment. What must be included with these checks? - A check that all connections are secure and
tight
How long should a gas furnace operate before a combustion test is taken? - After the gas furnace has
reached steady state
Aluminized steel heat exchangers are coated to prevent - rusting of the heat exchanger
Bent hands on a direct drive blower wheel in a gas furnace can cause - cutout on high limit, excessive
blower moto wear, and reduced motor torque
A dirty or clogged air filter in an operating heat pump system can cause - an increased temperature rise
Condensing furnaces take advantage of what additional form of heat contained in the flue gases? - latent
heat
How should a technician evaluate the circuitry on a residential gas furnace when the wiring diagram is
missing? - Draw the circuits on a notepad
You are responding to a report of "drafty air" in a room during the heating season.
The following conditions exist:
*Discharge air velocity 815 fpm,
