During a thermal imaging inspection, which signs indicate potential electrical or mechanical problems?

• A. Hot spots, abnormal temperature rises, and overheating components
• B. Lower vibration and cooler bearings
• C. No unusual noises and stable temperatures
• D. Negative temperature values

Answer: (A)

Thermal imaging looks for heat patterns that deviate from normal, which helps spot potential electrical and mechanical problems. When you see hot spots, abnormal temperature rises, or overheating components, it indicates areas where something is not performing correctly. Electrically, a loose connection, overloaded circuit, or failing contact adds resistance and generates extra heat, often showing up as a localized hotspot on the image. Mechanically, excessive friction or insufficient lubrication in bearings or misaligned parts can cause rapid heating in the affected area. These heat signatures are early warning signs that warrant closer inspection or corrective action.

Lower vibration and cooler bearings, no unusual noises with stable temperatures, or reading negative temperatures by themselves don’t point to a current fault in the same way. They either suggest normal operation or are not reliable indicators of a problem without additional context.