26. 有關離心式泵（Centrifugal pump）特性曲線（Characteristic curve）的敘述，下列何者正確？ (A) 泵的最大效率，會出現在出口閥全開時 (B) 泵的出口流量愈大，泵所需馬力也愈大 (C) 出口閥全關時，壓力能將轉換成流體的流速 (D) 出口閥全關時，泵所需馬力將達到最大

26. 有關離心式泵（Centrifugal pump）特性曲線（Characteristic curve）的敘述，下列何者正確？
(A) 泵的最大效率，會出現在出口閥全開時
(B) 泵的出口流量愈大，泵所需馬力也愈大
(C) 出口閥全關時，壓力能將轉換成流體的流速
(D) 出口閥全關時，泵所需馬力將達到最大

答案：登入後查看
統計： A(50), B(317), C(33), D(16), E(0) #1512188

私人筆記 (共 1 筆)

阿貴

2024/12/15

私人筆記#6579522

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透過特性曲線可知最高效率在90%負荷，輸...

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39. Check valves must be provided on pump suctions to prevent pumping through the standby pump to the sump. Pump isolating valves should be provided to permit underway repair of either pump. Based on these descriptions, which is the correct statement？ (A) The isolating valves must be non-return valves. (B) The check valve also needs to be positioned at the pump exit in order to improve the pumping efficiency. (C) The check valve allocated on pump suctions permits no flow from the idle pump into the sump. (D) The check valve allocated on pump suctions permits the isolation of the running and standby pumps so that the isolating valves could be ignored for the emergency operation.

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