单选题The boom indicator tells the operator at what angle the boom is compared to the（）.Ahorizontal position of the boomBvertical position of the boomChorizontal position of the load being liftedDvertical position of the load being lifted
单选题
The boom indicator tells the operator at what angle the boom is compared to the（）.
A
horizontal position of the boom
B
vertical position of the boom
C
horizontal position of the load being lifted
D
vertical position of the load being lifted
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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
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
The load chart of a ship crane enables the operator to combine the load radius with boom length to determine the ______．A.Maximum counter weight requiredB.Minimum horsepower requiredC.Hoist rope strengthD.Allowable load
What does “evel-luffing” accomplish during crane operations ________．A.It prevents the load from swinging when the boom level is adjustedB.Less power is needed when topping the boom with a load on the hookC.It maintains the height of the load above the deckD.All of the above
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
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 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The load chart of a crane enables the operator to combine the load radius with boom length to determine the（）.Amaximum counter weight requiredBminimum horsepower requiredChoist rope strengthDallowable load
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The load chart of a ship crane enables the operator to combine the load radius with boom length to determine the（）.Amaximum counter weight requiredBminimum horsepower requiredChoist rope strengthDallowable load
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What will NOT decrease the stability of a vessel?（）ATopside icingBRunning with a following seaCUsing 35% of the fuel in a full tankDLowering a weight suspended by a boom onto the deck
单选题What is meant by spotting the boom?（）ALowering it into a cradleBPlacing it in a desired positionCSpotting it with wash primer and red leadDTwo-blocking it
单选题What does “evel-luffing” accomplish during crane operations（）.AIt prevents the load from swinging when the boom level is adjustedBLess power is needed when topping the boom with a load on the hookCIt maintains the height of the load above the deckDAll of the above
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
单选题The best way to determine if a load is within maximum lift limits is to use（）.Aa boom angle indicatorBa load weight indicatorCmaterial invoices for shipping weightsDprior experience with similar lifts