單項選擇題What is the principle behind dynamic braking as used on an anchor windlass?()

A.Electrical loading
B.Mechanical distribution
C.Compressibility of air
D.Mechanical friction


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1.單項選擇題What is the holding power ratio of an anchor? ()

A.Maximum mooring line tension divided by the anchor's weight in air
B.Anchor's weight in air divided by the maximum mooring line tension
C.Preloading tension divided by the anchor's weight in air
D.Operating tension divided by the anchor's weight in air

2.單項選擇題What is the function of wearing rings found on some centrifugal pumps? ()

A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the outlet side from the inlet side
D.Dampen the turbulent discharge flow