What is the formula for number of tubes?(a) number of tubes = (1/ 8 * area of each tube) * (total loss / temperature rise with tubes – 12.5 * dissipating surface)(b) number of tubes = (1* 8 * area of each tube) * (total loss / temperature rise with tubes – 12.5 * dissipating surface)(c) number of tubes = (1/ 8 * area of each tube) / (total loss / temperature rise with tubes – 12.5 * dissipating surface)(d) number of tubes = (1/ 8 * area of each tube) + (total loss / temperature rise with tubes – 12.5 * dissipating surface)The question was posed to me in an international level competition.The question is from Design of Tank in portion Design of Transformers of Design of Electrical Machines

What is the formula for number of tubes?(a) number of tubes = (1/ 8 *

1.	What is the formula for number of tubes?(a) number of tubes = (1/ 8 * area of each tube) * (total loss / temperature rise with tubes – 12.5 * dissipating surface)(b) number of tubes = (1* 8 * area of each tube) * (total loss / temperature rise with tubes – 12.5 * dissipating surface)(c) number of tubes = (1/ 8 * area of each tube) / (total loss / temperature rise with tubes – 12.5 * dissipating surface)(d) number of tubes = (1/ 8 * area of each tube) + (total loss / temperature rise with tubes – 12.5 * dissipating surface)The question was posed to me in an international level competition.The question is from Design of Tank in portion Design of Transformers of Design of Electrical Machines
Answer» The CORRECT ANSWER is (a) number of TUBES = (1/ 8 * area of each tube) * (total loss / temperature rise with tubes – 12.5 * dissipating surface) Easiest explanation: First the temperature rise with tubes is obtained. Then the iron loss and copper loss are obtained and added. Area of each tube is also obtained. Substituting all the values in the above formula provides the number of tubes.

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