HVAC Star Practice Exam

Which statement about roller bearings is true?

They are used with small motors under light loads They are used only in belt-driven pumps They require no lubrication They are typically used with large motors operating under heavy loads

Correct Answer:

They are typically used with large motors operating under heavy loads

Explanation:

Roller bearings are built to carry heavy radial loads and provide stiffness because the rolling elements create line contact with the raceways, distributing load over a larger area than point contact (as seen with many other bearing types). This makes them well suited to large motors and equipment that must handle substantial forces and sustain reliability under demanding conditions. They still need proper lubrication to minimize wear and heat, so saying they require no lubrication isn’t accurate. They aren’t limited to belt-driven pumps; roller bearings are used in a wide range of applications, especially where heavy loads are involved. So the statement that they are typically used with large motors operating under heavy loads is the best fit.

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