G2 Gas Fitter Practice Exam

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Infrared and tube heaters transfer heat primarily through which method?

Conduction
Convection
Radiation
Direct contact

The correct answer is: Radiation

Infrared and tube heaters primarily transfer heat through radiation. This method involves the emission of infrared energy, which travels through the air and warms objects directly without needing to heat the air in between. When infrared rays reach an object, the energy is absorbed, leading the object to increase in temperature. This is particularly efficient for heating spaces or surfaces in environments where air movement is minimal, as it focuses on warming the items in the area rather than just the air itself. In contrast, conduction refers to heat transfer through direct contact between materials, while convection involves the movement of heat by circulating air or fluids, which is not the primary mechanism for infrared and tube heaters. Direct contact is also not applicable in this scenario, as the heat does not require physical contact to be transferred.