NATE GAS EXAM PREP VERSION 1 2026/2027
WITH ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|CURRENTLY TESTING QUESTIONS AND
SOLUTIONS|NEWEST |JUST
RELEASED!!|BRAND NEW VERSION
A Worn pulley is a cause for:
Blower belt noise.
A wet bulb reading that is very close to the dry bulb reading from the same instrument
indicates:
Relative humidity is very high.
You are responding to a report of "drafty air" in a room during the heating season.
The problem is register velocity is too low.
Heat always moves to equalize temperature. Convection moves warmer air to the ceiling as it is
added to the space which causes:
The temperature in the rooms not to be the same.
The secondary condensate drain of an air conditioning coil mounted with a horizontal gas
furnace in the attic must always be connected:
To a location readily visible and according to local code.
A typical four-way multipositional gas furnace is converted from upflow to down flow by:
Turning the furnace upside down with specified alterations.
The role oxygen plays in the proper combustion of natural gas is it:
1|Page
,Combines with the carbon to form carbon dioxide and with the hydrogen to form water vapor.
Heat exchangers are typically sealed:
In the furnace housing by gaskets
the most important consideration when working on a gas furnace with ribbon type burners is
the:
Individual burners must be mounted in correct alignment.
An 80% efficiency gas furnace, mounted in a crawlspace:
Draws its combustion air from the space surrounding the furnace’
Combustion air is often brought into a non-direct vent gas furnace, located in an interior closet
(confined space).
Two permanent openings of sufficient size must be used is important to remember.
A"cross break" made on all sides of any rectangular section of metal duct will:
Increase rigidity and reduced vibration.
The voltage most often used to power a residential package unit is:
240V single Φ.
When thermocouple pilot flame is lost on a standing pilot gas furnace, the primary component
which shuts off gas flow to the main burner is the
Pilot solenoid
How much of the end of the thermocouple should be enveloped by the pilot flame:
3/8 to 1/2 inch
Primary air is mixed with the gas within the:
Burner head.
2|Page
, What is the purpose of an induced draft blower in a non-condensing gas furnace:
To create a negative pressure in the heat exchanger.
In the sequence of operation of an induced draft, intermittent pilot gas furnace:
The induced draft motor starts when the thermostat calls for heat
A gas furnace with a standing pilot uses a flame switch for proving pilot flame.
several millivolts are generated by the flame.
The purpose of a secondary heat exchanger in a condensing gas furnace is to:
Extract additional heat from the exhaust gas.
An intermittent pilot gas furnace is one in which:
A pilot is lit on every call for heat
The height limitation for a vertical combustion air intake on a condensing gas furnace is:
Set by the furnace manufacturer.
The relationship between inrush current and holding current of a relay coil is:
Inrush current is always greater than holding current.
On a single stage combination gas valve with a thermocouple flame proving circuit:
The main burner gas flow is in series with the pilot gas valve.
A thermopile system usually generates its own control circuit voltage of:
750 mV.
Seven Day programmable thermostats are designed to be individually programmed:
For each day of the week.
The range of temperature over which an electromechanical thermostat does not call for heating
or cooling cycles when set in the AUTO mode is called the "deadband" of the thermostat:
3|Page
WITH ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|CURRENTLY TESTING QUESTIONS AND
SOLUTIONS|NEWEST |JUST
RELEASED!!|BRAND NEW VERSION
A Worn pulley is a cause for:
Blower belt noise.
A wet bulb reading that is very close to the dry bulb reading from the same instrument
indicates:
Relative humidity is very high.
You are responding to a report of "drafty air" in a room during the heating season.
The problem is register velocity is too low.
Heat always moves to equalize temperature. Convection moves warmer air to the ceiling as it is
added to the space which causes:
The temperature in the rooms not to be the same.
The secondary condensate drain of an air conditioning coil mounted with a horizontal gas
furnace in the attic must always be connected:
To a location readily visible and according to local code.
A typical four-way multipositional gas furnace is converted from upflow to down flow by:
Turning the furnace upside down with specified alterations.
The role oxygen plays in the proper combustion of natural gas is it:
1|Page
,Combines with the carbon to form carbon dioxide and with the hydrogen to form water vapor.
Heat exchangers are typically sealed:
In the furnace housing by gaskets
the most important consideration when working on a gas furnace with ribbon type burners is
the:
Individual burners must be mounted in correct alignment.
An 80% efficiency gas furnace, mounted in a crawlspace:
Draws its combustion air from the space surrounding the furnace’
Combustion air is often brought into a non-direct vent gas furnace, located in an interior closet
(confined space).
Two permanent openings of sufficient size must be used is important to remember.
A"cross break" made on all sides of any rectangular section of metal duct will:
Increase rigidity and reduced vibration.
The voltage most often used to power a residential package unit is:
240V single Φ.
When thermocouple pilot flame is lost on a standing pilot gas furnace, the primary component
which shuts off gas flow to the main burner is the
Pilot solenoid
How much of the end of the thermocouple should be enveloped by the pilot flame:
3/8 to 1/2 inch
Primary air is mixed with the gas within the:
Burner head.
2|Page
, What is the purpose of an induced draft blower in a non-condensing gas furnace:
To create a negative pressure in the heat exchanger.
In the sequence of operation of an induced draft, intermittent pilot gas furnace:
The induced draft motor starts when the thermostat calls for heat
A gas furnace with a standing pilot uses a flame switch for proving pilot flame.
several millivolts are generated by the flame.
The purpose of a secondary heat exchanger in a condensing gas furnace is to:
Extract additional heat from the exhaust gas.
An intermittent pilot gas furnace is one in which:
A pilot is lit on every call for heat
The height limitation for a vertical combustion air intake on a condensing gas furnace is:
Set by the furnace manufacturer.
The relationship between inrush current and holding current of a relay coil is:
Inrush current is always greater than holding current.
On a single stage combination gas valve with a thermocouple flame proving circuit:
The main burner gas flow is in series with the pilot gas valve.
A thermopile system usually generates its own control circuit voltage of:
750 mV.
Seven Day programmable thermostats are designed to be individually programmed:
For each day of the week.
The range of temperature over which an electromechanical thermostat does not call for heating
or cooling cycles when set in the AUTO mode is called the "deadband" of the thermostat:
3|Page
