Which set includes three common rotating equipment types found in mechanical systems?

Which set includes three common rotating equipment types found in mechanical systems?

• A. Valves, seals, and shafts.
• B. Gears, bearings, and shafts.
• C. Pumps, motors, and fans.
• D. Pumps, boilers, and turbines.

Answer: (C)

Rotating equipment refers to machines that rotate to perform essential tasks in a mechanical system. Pumps, motors, and fans are three foundational types: a pump uses a rotating impeller to add energy to a liquid and move it through the system; a motor converts electrical energy into rotational mechanical energy to drive loads; a fan uses blade rotation to move air for cooling, ventilation, or air handling. These three cover the main ways rotation powers a system—moving fluids, delivering motion to equipment, and circulating air. The other options mix in components or incomplete categories rather than full equipment families: valves, seals, and shafts are parts used within machines; gears, bearings, and shafts are components that appear inside many rotating assemblies; pumps, boilers, and turbines combines a non-rotating boiler with rotating turbines, so it doesn’t represent three common rotating equipment types together.

Rotating equipment refers to machines that rotate to perform essential tasks in a mechanical system. Pumps, motors, and fans are three foundational types: a pump uses a rotating impeller to add energy to a liquid and move it through the system; a motor converts electrical energy into rotational mechanical energy to drive loads; a fan uses blade rotation to move air for cooling, ventilation, or air handling. These three cover the main ways rotation powers a system—moving fluids, delivering motion to equipment, and circulating air. The other options mix in components or incomplete categories rather than full equipment families: valves, seals, and shafts are parts used within machines; gears, bearings, and shafts are components that appear inside many rotating assemblies; pumps, boilers, and turbines combines a non-rotating boiler with rotating turbines, so it doesn’t represent three common rotating equipment types together.