What type of temperature transmitter would be most suitable for measuring running gear bearing temperatures in a diesel engine in that it requires no contact with the bearing?

Correct Answer: Option B — Radiation pyrometer

Radiation pyrometers measure infrared energy emitted by an object without physical contact. This makes them ideal for monitoring high-speed, inaccessible, or moving components like diesel engine running gear bearings, where traditional contact-based sensors like RTDs or thermocouples would be impractical or subject to mechanical damage.