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毎日1問、正解者には6つの財富を、参加者には2つの財富をプレゼント;7月7日

2016-07-07View Original

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単一選択問題:ポンプの容積効率とは、実際に送り出される流体の量と、漏れが全くない理想的な状態で送り出せる流体の量との比率のことです。遠心ポンプが一定時間稼働した後、その容積効率が低下する原因の一つは__( )___です。 A. 間隙の拡大; B. 振動増大; C. 抵抗が増大する; D. キャビテーションが増大する。 答え:A. 間隙が広がる;

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