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What is the range of the difference of air temperature at inlet and outlet?

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in Design of Electrical Machines by (687k points)
What is the range of the difference of air temperature at inlet and outlet?

(a) 11-15^0C

(b) 10-13^0C

(c) 12-16^0C

(d) 14-18^0C

I had been asked this question in examination.

Origin of the question is Design of Fan in division Aspects of Design of Mechanical Parts of Design of Electrical Machines

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Correct answer is (c) 12-16^0C

For explanation: The difference of air temperatures at inlet and outlet has a minimum value of 12^0C. The difference of air temperatures at inlet and outlet has a maximum value of 16^0C.

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