28.大型冷凍裝置滑油分離器回油管上裝設之電磁閥在何時開啟？ (A)壓縮機運轉 (B)壓縮機停俥 (C)曲軸箱油位過低 (D)油分離器油位過高

28.大型冷凍裝置滑油分離器回油管上裝設之電磁閥在何時開啟？
(A)壓縮機運轉
(B)壓縮機停俥
(C)曲軸箱油位過低
(D)油分離器油位過高

答案：登入後查看
統計： A(261), B(19), C(30), D(115), E(0) #601699

私人筆記 (共 1 筆)

許允真

2025/01/03

私人筆記#6623839

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在大型冷凍裝置中，滑油分離器的回油管上裝...

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10.Longitudinal vibration of propulsion shafting systems is often excited by the variable thrust developed by the propeller due to the non-uniform wake pattern in which it operates. The predominant periodic component of the thrust developed by a propeller occurs at blade-rate frequency, i.e., the number of propeller blades times the rotational frequency of the shaft. For a four-blade propeller running at 60 rev/min, what is the predominant periodic frequency that excites the longitudinal vibration of the propulsion shafting systems? (A)1 Hz (B)2 Hz (C)3 Hz (D)4 Hz

28.大型冷凍裝置滑油分離器回油管上裝設之電磁閥在何時開啟？
(A)壓縮機運轉
(B)壓縮機停俥
(C)曲軸箱油位過低
(D)油分離器油位過高

私人筆記 (共 1 筆)

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