問題詳情

8、 The collection efficiency of a cyclone is 45% over the size range 0-5 mm, 80% over the size range 5-10 mm, and 96% for particles exceeding 10 mm. Calculate the total efficiency of collection for the following dust: 50% 0-5 mm, 30% 5-10 mm, 20% above 10 mm.
(A)86%
(B)71%
(C)53%
(D) 65.7%

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

用户評論

【用戶】Sam Chang

【年級】幼稚園下

【評論內容】假設total為100 g : 0-5 mm 50 g ; 5-10 mm 30 g ; 10 mm 20 g效率分別為 : 45% ; 80% ; 96%50 g*0.45+30 g*0.8+20 g*0.96 = 65.7 g得解 : 65.7 g / 100 g = 65.7%