What can be used to listen to a pump in operation?

• A. Hammer
• B. Screwdriver
• C. Stethoscope
• D. Flashlight

Answer: (C)

Listening to a pump while it runs relies on capturing the sounds of its moving parts to identify abnormalities. A stethoscope focuses and transmits those noises from the pump’s bearings, seals, and impeller through the diaphragm or bell to your ears, making subtle issues like grinding, squealing, knocking, or cavitation easier to detect. This is a standard diagnostic approach because it enhances our ability to hear problems that might be missed by ear alone.

Using a hammer is for tapping and can damage the equipment or create misleading sounds. A screwdriver is not a reliable listening tool in this context (and using makeshift devices can be unsafe). A flashlight merely provides light and does not help with listening.