Question

What is the concept of thermal loading?

(a) Output power is indirectly proportional to the temperature rise

(b) Output power is indirectly proportional to the square of temperature rise

(c) Output power is directly proportional to the temperature rise

(d) Output power is directly proportional to the square of temperature rise

I had been asked this question in final exam.

I'd like to ask this question from Rating of Machines in chapter Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

Answer 1

Right answer is (c) Output power is directly proportional to the temperature rise

For explanation I would say: Thermal loading is nothing, but the increase of the output power with respect to the temperature rise. It can lead to the power rating levels being crossed.