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G2 EXAM QUIZ BANK UPDATE) QUESTIONS
AND VERIFIED ANSWERS| 100% CORRECT|
GRADE A
The type of heat exchanger associated with a forced air combination system is
ANSWER: A water to air type
ANSWER: Forced air combination systems typically use water-
to-air heat exchangers to transfer heat.
How is a high limit tested on a forced warm air furnace?
ANSWER: By disconnecting the air circulating blower
ANSWER: Disconnecting the blower simulates overheating,
testing the high limit switch’s response.
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As the gauge number of a conductor decreases, the voltage drop across the conductor
ANSWER: Decreases
ANSWER: A lower gauge number means thicker wire, reducing
resistance and voltage drop.
Causes cold denser outdoor air to enter through openings in the lower portion of the building envelope, where it is heated, and exit through openings in the upper building envelope where the building essentially becomes a chimney
ANSWER: Stack effect
ANSWER: Stack effect drives air movement due to temperature
and pressure differences.
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What is used to counter balance the downstream pressure in a regulator?
ANSWER: The loading element
ANSWER: The loading element (e.g., spring or diaphragm)
adjusts to balance downstream pressure.
What is the basic sequence of operation of a control module?
ANSWER: Perform safe start check, ignite the flame, power the
gas valve, proof presence of flame, monitor flame during burner cycle
ANSWER: This sequence ensures safe and continuous burner
operation.
How is the Heat Anticipator setting determined for a Thermostat with an adjustable Anticipator?
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ANSWER: By measuring the current drawn by the components
in the circuit being fed directly by the thermostat
ANSWER: Current measurement sets the anticipator to match
system timing.
What is true regarding perfect combustion?
ANSWER: Unable to be maintained in a combustion chamber
ANSWER: Perfect combustion is theoretical; real-world
conditions prevent it.
What is wind effect?
ANSWER: Wind can cause positive pressure on the windward
side of the building and negative pressure on the leeward side and on the sides parallel to the wind flow