TSSA Refrigeration Class 4A Certificate Practice Exam 2026 – Complete Prep Guide

Question: 1 / 745

How does radiant heat travel?

Travels in straight lines

Radiant heat travels in straight lines, which means that it propagates directly from the source without needing a medium to carry it. This characteristic allows radiant heat to efficiently transfer energy directly to objects in its path without heating the surrounding air or fluid, which contrasts with other forms of heat transfer, such as convection or conduction.

For example, when standing near a fire, you can feel the warmth on your skin without the air being hot. This is because the radiant heat energy is traveling directly to you in straight lines. Understanding this principle is essential in applications such as heating systems and thermal energy management, where manipulating radiant heat can significantly impact energy efficiency and comfort.

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Is present in oil firing only

Requires a transfer medium

Radiates through water in the water walls

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