HVAC NATE Gas Heat Exam (New 2024/ 2025 Update) Questions and Verified Answers 100% Correct | A Grade
QUESTION
A damaged section of double wall
... [Show More] vent pipe is to be replaced with a section produced by a different manufacturer:
Answer:
The installer should check the new section for compatible locking joints.
QUESTION
If too much primary air is used the flame will:
Answer:
Lift off the burner.
QUESTION
What is the problem when a flame on a high efficiency gas furnace is burning primarily yellow:
Answer:
The flame is burning without sufficient combustion air.
QUESTION
The cause of a voltage reading across a closed contact in a 24V control circuit is:
Answer:
Pitted or dirty contacts.
QUESTION
The following are the first two checks typically made on an electronic control:
Answer:
Presence of any on board transformer voltage.
Proper output voltage.
QUESTION
During a service call on a unit the technician finds that the wiring diagram is missing from the access panel. The technician may begin troubleshooting by:
Answer:
Tracing the circuits either mentally or on a sketch pad.
QUESTION
The first check made for most electrical troubleshooting is a:
Answer:
Voltage check of the supply line.
QUESTION
The test to be used to check the wiring and connections to the terminals of an energized blower motor is a:
Answer:
Voltage test.
QUESTION
The following conditions exist in a circuit that supplies power to three parallel loads.
Answer:
The total current in the circuit when operating will be the sum of the currents through each load.
QUESTION
To test the continuity of an internal overload protector in a single-phase motor the motor:
Answer:
Must be cool.
QUESTION
A control string is defined as two or more switch contacts connected in a circuit, or set of circuits, to control a load. In order to troubleshoot a load controlled by a control string, the technician must first:
Answer:
Check for proper voltage applied across the load.
QUESTION
When troubleshooting a blower motor circuit on a packaged system, 244V is measured across the motor and no amperage is measured:
Answer:
The likely problem with this system is an internal overload device is open.
QUESTION
The continuity through a de-energized relay coil is checked by using what?
Answer:
Ohmmeter
QUESTION
What is the industry accepted method for locating a suspected natural gas leak?
Answer:
A soap solution.
QUESTION
A customer has concerns about carbon monoxide (CO) in their hone. Many of their reported symptoms indicate there may indeed be a CO problem but on each trip the technician makes to check their home the technician finds normal CO levels.
Answer:
CO detector reader/recorder would be appropriate to use for determining if a problem truly exists.
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