19.直接傳動之船舶推進裝置，多採用下列那一型柴油主機？ (A)低速 (B)中速 (C)高速 (D)雙主機低速

19.直接傳動之船舶推進裝置，多採用下列那一型柴油主機？
(A)低速
(B)中速
(C)高速
(D)雙主機低速

答案：登入後查看
統計： A(326), B(33), C(24), D(6), E(0) #601690

私人筆記 (共 1 筆)

許允真

2024/12/23

私人筆記#6597820

未解鎖

因為低速柴油主機能夠提供較大的扭矩，並且...

(共 96 字，隱藏中）

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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

19.直接傳動之船舶推進裝置，多採用下列那一型柴油主機？
(A)低速
(B)中速
(C)高速
(D)雙主機低速

私人筆記 (共 1 筆)

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