M

Mr. Dubey • 52.30K Points
Coach 

Q. What is the maximum value of efficiency in a draft tube?

(A) 100
(B) 50
(C) 90
(D) 40
Correct : Option (C)

Explanation: 
 the maximum value of efficiency in a draft tube is 90 percent. it cannot exceed more than 90 percent because of the heat losses due to flow of fluid.

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