Question

What is the relation of the increase of the oil circulation rate with energy losses?

(a) increase of the oil circulation rate is not depending with energy losses

(b) increase of the oil circulation rate is directly proportional to the energy losses

(c) increase of the oil circulation rate is directly proportional to the square of energy losses

(d) increase of the oil circulation rate is indirectly proportional to energy losses

I had been asked this question in semester exam.

My doubt stems from Methods of Cooling of Transformers topic in portion Design of Transformers of Design of Electrical Machines

Answer 1

Right option is (b) increase of the oil circulation rate is directly proportional to the energy losses

For explanation I would say: The increase in the oil circulation rate is unsuitable because this increases the large energy losses In the pumping unit. To cool the oil, it is circulate through a special oil cooler.