The thin, horizontal baffles that separate the tubes within the radiator are called what?

• A. Baffles
• B. Fins
• C. Ribs
• D. Screens

Answer: (B)

The main idea here is identifying the radiator components that maximize heat transfer. The thin, horizontal pieces that sit between the tubes are fins. They run across the flow path and provide a large surface area for heat to move from the coolant inside the tubes to the air flowing over the radiator. This is why fins are described as thin, horizontal elements that separate and space the tubes to improve cooling efficiency.

Baffles are used inside the end tanks to direct the coolant through the tubes, not to separate the tubes themselves. Ribs are structural supports, and screens are mesh barriers used for filtration or flow control rather than separating tubes. So fins best fit the description.