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A boom vang ______.
A.holds the boom down and flattens the main sail
B.draws the head of the sail to windward
C.tautens the standing rigging
D.douses the gaff topsail
参考答案
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单选题The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.A
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Lowering the boomB
Raising the boomC
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单选题The boom stops on a pedestal crane prevent the boom from（）.A
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swinging at seaC
overloading when not in useD
being lowered too low
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单选题What is meant by the term“luffing the boom”of a crane（）．A
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单选题The process of lowering a boom to a horizontal position and onto its deck support is called（）.A
spotting a boomB
collaring a boomC
cradling a boomD
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单选题Which statement is TRUE concerning the gooseneck（）.A
It is a sailing maneuver which brings the vessel's head through the windB
It connects the boom to the mast and allows the boom to swing freelyC
It is a sailing condition where there is a loss of air flow over the sailsD
None of the above
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单选题The main advantage and chief characteristic of a Steulchen boom is that it can be（）.A
operated by one winchmanB
cradled on deckC
swung from one hatch to the adjacent hatchD
collared to the mast
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单选题The boom stops are installed on an offshore crane to（）.A
prevent the boom from being raised too highB
prevent the boom from swingingC
support the boom when not in useD
prevent the boom from being lowered
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单选题For a given weight of cargo，the stress on the heel block of a cargo boom（）.A
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单选题A boom vang（）.A
holds the boom down and flattens the main sailB
draws the head of the sail to windwardC
tautens the standing riggingD
douses the gaff topsail
考题
单选题With a given load on the cargo hook，the thrust on a cargo boom（）.A
increases as the angle to the horizontal increasesB
increases as the angle to the horizontal decreasesC
is greatest at an angle of 45° and decreases as the boom is raised or loweredD
is least at an angle of 45° and increases as the boom is raised or lowered
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单选题With a given load on the cargo hook，tension in a single span topping lift（）.A
increases as the boom's angle to the horizontal increasesB
is at a maximum when the boom is at a 45° angle to the horizontalC
increases as the boom's angle to the horizontal decreasesD
decreases as the boom's angle to the horizontal decreases
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单选题When viewed from above，the best position for the guy in relation to the boom is（）.A
At a 45° angleB
At right anglesC
4 feet aft of the heel of the boomD
Parallel to the boom
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单选题The pivot pin at the base of a sheath-screw boom davit must be（）.A
inserted each time before the booms are cranked outB
periodically removed for inspection and lubricatedC
replaced at each inspection for certificationD
in the locked position after the boat is cradled and griped down
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单选题0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.A
vertical positionB
horizontal positionC
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minimum radius angle
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单选题The boom indicator on a crane will indicate the（）.A
length of the boomB
angle of the boomC
lifting capacity of the boomD
direction of the boom
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