Nate Gas Furnace Service with correct
answers 2026
What-precautions,-if-any,-must-be-taken-when-installing-a-gas-furnace-on-a-wooden-platform-
in-an-attic?---correct-answers--Use-a-zero-clearance-furnace-or-add-a-non-combustible-base
A-vent-connector-should-have-a-as-few-elbows-and-joints-as-possible-to:---correct-answers--
Reduce-resistance-of-flue-gases
The-gas-control-valve-may-be-damaged-if-exposed-to-an-inlet-pressure-above---correct-
answers--14in-wc
To-which-thermostat-is-leveling-the-most-critical:---correct-answers--Mercury-Bulb
Which-of-the-following-is-a-reason-for-the-thermostat-to-short-cycle-a-gas-furnace---correct-
answers--A-system-that-is-oversized-for-the-load
When-a-thermocouple-pilot-flame-is-lost-on-a-standing-pilot-gas-furnace,-the-primary-
component-which-shuts-off-gas-flow-to-the-main-burner-is:---correct-answers--Pilot-solenoid
The-most-important-consideration-when-working-on-a-gas-furnace-with-ribbon-type-insertion-
burners-is---correct-answers--The-individual-burners-must-be-mounted-in-correct-alignment
,Primary-air-is-mixed-with-the-gas-within-the---correct-answers--Venturi-or-throat-of-the-burner
An-intermittent-pilot-gas-furnace-is-one-in-which-a---correct-answers--Pilot-is-lit-on-every-call-
for-heat
The-pressure-reading-on-a-monometer-is-expressed-in-inches-of---correct-answers--Water
How-mush-of-the-end-of-the-thermocouple-should-be-enveloped-by-the-pilot-flame---correct-
answers--3/8-to-½-inch
The-LP-gas-manifold-pressure-is-commonly---correct-answers--10-to-11in-wc
A-thermocouple-system-usually-generates-its-own-control-circuit-voltage-of---correct-answers--
750mv
On-a-single-stage-combination-gas-valve-with-a-thermocouple-flame-proving-circuit,-the-main-
burner-gas-flow-is---correct-answers--In-series-with-the-pilot-gas-valve
What-do-the-initials-"A.F.U.E"-represent---correct-answers--Annual-Fuel-Utilization-Efficiency
A-technician-measures-the-return-air-temperature-of-a-100,000-btuh-output-gas-furnace-to-
be-65-F-and-the-supply-side-air-temperature-is-135F-What-is-the-CFM---correct-answers--135-
65=70TD
70TD-x-1.08-=-75.6
100,000/75.6-=-13,227CFM
, A-furnace-is-inoperative-because-of-a-failure-in-the-ignition-sequence-of-the-flame-proving-
stage.-To-check-the-flame-proving-circuit-the-technician-would-connect-a:---correct-answers--
Microammeter-set-to-DC-microamps-in-the-flame-rod-circuit-and-operate-the-furnace
A-flame-on-a-high-efficiency-gas-furnace-is-burning-primarily-yellow.-What,-if-anything-is-the-
problem-in-this-furnace---correct-answers--The-flame-is-burning-without-sufficient-
combustion-air
A-typical-four-way-multi-positional-gas-furnace-is-converted-from-up-flow-to-downflow-by---
correct-answers--Turning-the-furnace-upside-down-with-specified-alterations
In-the-sequence-of-operation-of-an-induced-draft,-intermittent-pilot-gas-furnace,-the-induced-
draft-motor-starts---correct-answers--When-the-thermostat-calls-for-heat
A-gas-furnace-with-a-standing-pilot-uses-a-flame-switch-for-proving-pilot-flame.-What-type-of-
signal-is-generated-by-such-a-flame-prover---correct-answers--NO-Signal-is-generated-by-a-
flame-switch,-but-the-flame-sensor
Which-of-the-following-components-is-considered-a-fire-protection-device-on-a-gas-furnace---
correct-answers--Roll-out-switch
With-a-non-direct-vented-furnace-located-in-a-what-are-the-requirements-for-the-space-to-
qualify-as-an-unconfined-space---correct-answers--At-least-50-ft3-of-air-volume-for-every-1000-
btuh-of-all-the-combustion-appliances-in-the-space
A-technician-is-installing-a-system-for-a-condensing-gas-furnace.-The-furnace-is-several-feet-
from-a-gas-water-heater.-Under-what-conditions,-if-any,-may-the-technician-route-the-exhaust-
of-the-furnace-into-the-exhaust-vent-of-the-water-heater---correct-answers--Under-no-
conditions-may-you-use-the-water-heater-exhaust-vent
answers 2026
What-precautions,-if-any,-must-be-taken-when-installing-a-gas-furnace-on-a-wooden-platform-
in-an-attic?---correct-answers--Use-a-zero-clearance-furnace-or-add-a-non-combustible-base
A-vent-connector-should-have-a-as-few-elbows-and-joints-as-possible-to:---correct-answers--
Reduce-resistance-of-flue-gases
The-gas-control-valve-may-be-damaged-if-exposed-to-an-inlet-pressure-above---correct-
answers--14in-wc
To-which-thermostat-is-leveling-the-most-critical:---correct-answers--Mercury-Bulb
Which-of-the-following-is-a-reason-for-the-thermostat-to-short-cycle-a-gas-furnace---correct-
answers--A-system-that-is-oversized-for-the-load
When-a-thermocouple-pilot-flame-is-lost-on-a-standing-pilot-gas-furnace,-the-primary-
component-which-shuts-off-gas-flow-to-the-main-burner-is:---correct-answers--Pilot-solenoid
The-most-important-consideration-when-working-on-a-gas-furnace-with-ribbon-type-insertion-
burners-is---correct-answers--The-individual-burners-must-be-mounted-in-correct-alignment
,Primary-air-is-mixed-with-the-gas-within-the---correct-answers--Venturi-or-throat-of-the-burner
An-intermittent-pilot-gas-furnace-is-one-in-which-a---correct-answers--Pilot-is-lit-on-every-call-
for-heat
The-pressure-reading-on-a-monometer-is-expressed-in-inches-of---correct-answers--Water
How-mush-of-the-end-of-the-thermocouple-should-be-enveloped-by-the-pilot-flame---correct-
answers--3/8-to-½-inch
The-LP-gas-manifold-pressure-is-commonly---correct-answers--10-to-11in-wc
A-thermocouple-system-usually-generates-its-own-control-circuit-voltage-of---correct-answers--
750mv
On-a-single-stage-combination-gas-valve-with-a-thermocouple-flame-proving-circuit,-the-main-
burner-gas-flow-is---correct-answers--In-series-with-the-pilot-gas-valve
What-do-the-initials-"A.F.U.E"-represent---correct-answers--Annual-Fuel-Utilization-Efficiency
A-technician-measures-the-return-air-temperature-of-a-100,000-btuh-output-gas-furnace-to-
be-65-F-and-the-supply-side-air-temperature-is-135F-What-is-the-CFM---correct-answers--135-
65=70TD
70TD-x-1.08-=-75.6
100,000/75.6-=-13,227CFM
, A-furnace-is-inoperative-because-of-a-failure-in-the-ignition-sequence-of-the-flame-proving-
stage.-To-check-the-flame-proving-circuit-the-technician-would-connect-a:---correct-answers--
Microammeter-set-to-DC-microamps-in-the-flame-rod-circuit-and-operate-the-furnace
A-flame-on-a-high-efficiency-gas-furnace-is-burning-primarily-yellow.-What,-if-anything-is-the-
problem-in-this-furnace---correct-answers--The-flame-is-burning-without-sufficient-
combustion-air
A-typical-four-way-multi-positional-gas-furnace-is-converted-from-up-flow-to-downflow-by---
correct-answers--Turning-the-furnace-upside-down-with-specified-alterations
In-the-sequence-of-operation-of-an-induced-draft,-intermittent-pilot-gas-furnace,-the-induced-
draft-motor-starts---correct-answers--When-the-thermostat-calls-for-heat
A-gas-furnace-with-a-standing-pilot-uses-a-flame-switch-for-proving-pilot-flame.-What-type-of-
signal-is-generated-by-such-a-flame-prover---correct-answers--NO-Signal-is-generated-by-a-
flame-switch,-but-the-flame-sensor
Which-of-the-following-components-is-considered-a-fire-protection-device-on-a-gas-furnace---
correct-answers--Roll-out-switch
With-a-non-direct-vented-furnace-located-in-a-what-are-the-requirements-for-the-space-to-
qualify-as-an-unconfined-space---correct-answers--At-least-50-ft3-of-air-volume-for-every-1000-
btuh-of-all-the-combustion-appliances-in-the-space
A-technician-is-installing-a-system-for-a-condensing-gas-furnace.-The-furnace-is-several-feet-
from-a-gas-water-heater.-Under-what-conditions,-if-any,-may-the-technician-route-the-exhaust-
of-the-furnace-into-the-exhaust-vent-of-the-water-heater---correct-answers--Under-no-
conditions-may-you-use-the-water-heater-exhaust-vent
