Which statement about pumps is false?

Which statement about pumps is false?

• A. Bearings can be over lubricated
• B. Fire point is defined as the point at which a lubricant will burn
• C. Most pumps are self-priming
• D. Oil is used in high rpm conditions, and grease is used in low speeds and heavy loads

Answer: (C)

Pumps rely on priming to create suction, and not all designs are capable of self-priming. A self-priming pump can pull water into the suction line after an initial fill, but many pumps require manual priming or a separate priming device, and some designs don’t re-prime well if the prime is lost. Because of that, the statement that most pumps are self-priming isn’t accurate in typical practice. The other statements align with common pump and lubrication facts: bearings can indeed be over-lubricated, which can cause overheating or seal problems; the fire point is the temperature at which a lubricant will ignite and continue to burn; and oil is used for high-speed or higher-temperature lubrication, while grease works well at low speeds and under heavy loads because it stays in place longer.

Pumps rely on priming to create suction, and not all designs are capable of self-priming. A self-priming pump can pull water into the suction line after an initial fill, but many pumps require manual priming or a separate priming device, and some designs don’t re-prime well if the prime is lost. Because of that, the statement that most pumps are self-priming isn’t accurate in typical practice.

The other statements align with common pump and lubrication facts: bearings can indeed be over-lubricated, which can cause overheating or seal problems; the fire point is the temperature at which a lubricant will ignite and continue to burn; and oil is used for high-speed or higher-temperature lubrication, while grease works well at low speeds and under heavy loads because it stays in place longer.