24.艉軸及螺槳安裝時，應進行何種檢查？ (A)壓力測試（Pressure test） (B)染色滲透檢驗（Dye check） (C)放射線檢驗（X-Ray inspection） (D)裝配檢查（Assembling inspection）

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

24.艉軸及螺槳安裝時，應進行何種檢查？
(A)壓力測試（Pressure test）
(B)染色滲透檢驗（Dye check）
(C)放射線檢驗（X-Ray inspection）
(D)裝配檢查（Assembling inspection）

相關試題

相關試卷