單項選擇題Which tackle arrangement has the LEAST mechanical advantage（）.

A.Single whip
B.Gun tackle
C.Luff tackle
D.Twofold purchase


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1.單項選擇題Which mooring line prevents sideways motion of a vessel moored to a pier（）.

A.A line led forward from the bow
B.A line led aft from the bow
C.A line led in the same direction as the keel
D.A line led at a right angle to the keel

2.單項選擇題When lowering lifeboats in heavy seas，a good practice is to rig frapping lines（）.

A.on only the forward falls
B.on only the after falls
C.with a lead of about 45 degrees to the boat
D.from the falls to the main deck of the vessel

3.單項選擇題What term indicates the line drawn at the top of the flat plate keel（）.

A.Base line
B.Molded line
C.Designer's waterline
D.Keel line

4.單項選擇題What is TRUE about hoisting operations（）.

A.Personnel may work beneath suspended loads，as long as they are alert and wear hard hats
B.If a suspended load with no tag begins to spin，personnel should attempt to stop the spinning if the load is within reach
C.If tag lines are used to control a suspended load，they should be secured to the deck
D.Personnel not involved in the hoisting operation should be kept clear of the transfer area