單項選擇題Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）

A.Slightly higher fuel consumption
B.Lack of directional control when backing
C.Inefficient at high shaft RPM
D.Some unusual handling characteristics


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1.單項選擇題Which change in the condition of the seas could indicate the formation of a tropical storm or hurricane several hundred miles from your location? （）

A.A long swell from an unusual direction
B.A lengthy lull in the wind and seas
C.Large seas coming from different directions
D.A brisk chop from the southeast

2.單項選擇題When the period of beam seas equals the natural rolling period of a vessel，what will most likely occur?（）

A.Excessive pitching
B.Excessive yawing
C.Excessive rolling
D.No change should be evident

3.單項選擇題When taking soundings on a floating ship，the tape should be lowered and brought back quickly to（）.

A.reduce the time the sounding tube is open
B.avoid creating a spark
C.lessen the effect of roll or pitch on the reading
D.lessen the effect of heave on the reading

4.單項選擇題When running before a heavy sea，moving weights aft will affect the handling of a vessel by （）.

A.reducing rolling
B.increasing rolling
C.reducing yawing
D.increasing yawing

5.單項選擇題When preparing a ship for heavy weather，fuel oil day tanks should be（）.

A.pumped overboard to calm the seas
B.drained to the lower hull to reduce free surfaces
C.filled to ensure that sufficient fuel oil is available during a lengthy emergency
D.partially drained to increase free surfaces in order to reduce motions