24. Hydraulic drives for deck machinery can be sub-divided into three features. Which
following cannot be?
(A) With variable displacement systems
(B) Constant pressure
(C) Constant volume
(D) Constant temperature
5. What kind of action should be done before operating any centrifugal pump?
(A) See pump glands
(B) Check lubrication
(C) Filling liquid for case
(D) Open the connection between pump and motor
6. For merchant propulsion turbines，the _______ of about 28.5 inches Hg has widely
accepted as the design basis.
(A) length
(B) vacuum
(C) temperature
(D) height
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