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
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
相关考题：
On a crane, the boom indicator tells the operator what angle the boom angle is compared to the ______.A.vertical positionB.horizontal positionC.boom stop angleD.minimum radius angle
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
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
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
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.raise the boomB.raise the hookC.raise the boom and hookD.check the boom stop
What is meant by the term“luffing the boom”of a crane ________．A.Stopping the boomB.Topping or lowering the boomC.Moving the boom left or rightD.All of the above
When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to ______．A.winch speedB.boom strengthC.load radiusD.cable strength
How should you signal the crane operator to lower the boom?______.A.With arm extended and fingers closed, point thumb downwardB.With arm extended downwards and forefinger pointing down, move hand in small horizontal circlesC.Extend arm with the palm down, and hold this position rigidlyD.With hands clasped in front of your body
ASP（音频控制面板）的正常位置是（）A、MASK／BOOM开关在BOOM位；ALT／NORM开关在NORM位B、MASK／BOOM开关在MASK位；ALT／NORM开关在NORM位C、MASK／BOOM开关在MASK位；ALT／NORM开关在ALT位D、MASK／BOOM开关在BOOM位；ALT／NORM开关在ALT位
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（）.Araise the boomBraise the hookCraise the boom and hookDcheck the boom stop
单选题What is meant by the term TOPPING THE BOOM?（）ALowering the boomBRaising the boomCSpotting the boom over the deckDSwinging the boom athwartships
单选题The boom stops on a pedestal crane prevent the boom from（）.Abeing raised too highBswinging at seaCoverloading when not in useDbeing lowered too low
单选题What is meant by the term“luffing the boom”of a crane（）．AStopping the boomBTopping or lowering the boomCMoving the boom left or rightDAll of the above
单选题The process of lowering a boom to a horizontal position and onto its deck support is called（）.Aspotting a boomBcollaring a boomCcradling a boomDtoppling a boom
单选题Which statement is TRUE concerning the gooseneck（）.AIt is a sailing maneuver which brings the vessel's head through the windBIt connects the boom to the mast and allows the boom to swing freelyCIt is a sailing condition where there is a loss of air flow over the sailsDNone of the above
单选题The main advantage and chief characteristic of a Steulchen boom is that it can be（）.Aoperated by one winchmanBcradled on deckCswung from one hatch to the adjacent hatchDcollared to the mast
单选题The boom stops are installed on an offshore crane to（）.Aprevent the boom from being raised too highBprevent the boom from swingingCsupport the boom when not in useDprevent the boom from being lowered
单选题For a given weight of cargo，the stress on the heel block of a cargo boom（）.Aincreases as the cargo closes the head while hoistingBincreases if the cargo runner is doubled upCdecreases as the boom is topped to a greater angleDis determined by the thrust stresses on the boom
单选题A boom vang（）.Aholds the boom down and flattens the main sailBdraws the head of the sail to windwardCtautens the standing riggingDdouses the gaff topsail
单选题With a given load on the cargo hook，the thrust on a cargo boom（）.Aincreases as the angle to the horizontal increasesBincreases as the angle to the horizontal decreasesCis greatest at an angle of 45° and decreases as the boom is raised or loweredDis least at an angle of 45° and increases as the boom is raised or lowered
单选题With a given load on the cargo hook，tension in a single span topping lift（）.Aincreases as the boom's angle to the horizontal increasesBis at a maximum when the boom is at a 45° angle to the horizontalCincreases as the boom's angle to the horizontal decreasesDdecreases as the boom's angle to the horizontal decreases
单选题When viewed from above，the best position for the guy in relation to the boom is（）.AAt a 45° angleBAt right anglesC4 feet aft of the heel of the boomDParallel to the boom
单选题The pivot pin at the base of a sheath-screw boom davit must be（）.Ainserted each time before the booms are cranked outBperiodically removed for inspection and lubricatedCreplaced at each inspection for certificationDin the locked position after the boat is cradled and griped down
单选题0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.Avertical positionBhorizontal positionCboom stop angleDminimum radius angle
单选题The boom indicator on a crane will indicate the（）.Alength of the boomBangle of the boomClifting capacity of the boomDdirection of the boom