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One question per day; no prize for correct answers, it’s just for entertainment

2019-11-19View Original

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17. Before starting a centrifugal pump, it should be filled with liquid, and the () should be closed to prevent backflow. ?A. Inlet valve??B. Outlet valve??C. Both inlet and outlet valves? The answer to the question from yesterday was B. 16. In assembly using thermal expansion fitting, when there is a certain amount of interference between the hole and the shaft, (B) is heated to cause it to expand. ? A、Shaft B、Hole???C、Hole and shaft?

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