What is the formula for the total head produced?(a) total head produced = ∑ coefficient of hydrodynamic resistance + volume of air passing per second^2(b) total head produced = ∑ coefficient of hydrodynamic resistance – volume of air passing per second^2(c) total head produced = ∑ coefficient of hydrodynamic resistance * volume of air passing per second^2(d) total head produced = ∑ coefficient of hydrodynamic resistance / volume of air passing per second^2This question was posed to me in an interview for internship.Question is from Design of Fan in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines

What is the formula for the total head produced?(a) total head produce

1.	What is the formula for the total head produced?(a) total head produced = ∑ coefficient of hydrodynamic resistance + volume of air passing per second^2(b) total head produced = ∑ coefficient of hydrodynamic resistance – volume of air passing per second^2(c) total head produced = ∑ coefficient of hydrodynamic resistance * volume of air passing per second^2(d) total head produced = ∑ coefficient of hydrodynamic resistance / volume of air passing per second^2This question was posed to me in an interview for internship.Question is from Design of Fan in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines
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