航海英語大風浪中航行單項選擇題每日一練(2019.01.18)

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
單項選擇題
Which is TRUE of a stiff vessel? （）
A.It has a small GM
B.It pitches heavily
C.It has an unusually high center of gravity
D.Its period of roll is short
單項選擇題
Which statement about stopping a vessel is TRUE?（）
A.A lightly laden vessel requires as much stopping distance as a fully laden vessel when the current is from astern
B.A vessel is dead in the water when the back wash from astern operation reaches the bow
C.A tunnel bow thruster can be used in an emergency to reduce the stopping distance
D.When a vessel is dead in the water any speed displayed by doppler log reflects the current
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
單項選擇題
Which statement concerning an automatic towing engine is FALSE? （）
A.It automatically maintains tow line tension
B.It prolongs the life of the hawser by distributing chafing as the hawser is paid out and taken in
C.As tension on the hawser increases，more line is taken in by the automatic towing engine
D.As tension on the hawser decreases，more line is taken in by the automatic towing engine