单选题A cargo boom is a（）.Adouble sized mattress consists of more than 890 coilsBspar extending from a mast or a king postCflap（Becker rudder）can be fitted to the rudder’s trailing edgeDbridle arrangement having a long beam of the length of the container
单选题
A cargo boom is a（）.
A
double sized mattress consists of more than 890 coils
B
spar extending from a mast or a king post
C
flap（Becker rudder）can be fitted to the rudder’s trailing edge
D
bridle arrangement having a long beam of the length of the container
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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
Stress on the topping lift of a swinging boom can be reduced by ______.A.rigging a back stayB.raising the boomC.increasing the mechanical advantage of the cargo purchaseD.taking all slack out of the preventer
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
If the cargo gear on your vessel is equipped with a regular guy and a preventer guy，you should ______．A.Let the schooner guy take most of the strain，thus transferring the load to the opposite boomB.Leave the preventer guy slackC.Secure them as close together as possible on deckD.Secure them so the angle between them is 90° at the boom head
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
Sudden starts or stops of the boom is likely to cause all of the following except______．A.breaking a cargo runnerB.parting guys topping liftsC.carrying away a blockD.overheating the resistors and eventually burning out
Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom ________．A.Cargo whipB.Gooseneck fittingC.Spider bandD.Topping lift
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Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.ACargo whipBGooseneck fittingCSpider bandDTopping lift
单选题The （）(笨重货) must be handled by jumbo boom or shore crane.Aawkward cargoBdrummed cargoCcased cargoDheavy cargo
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On your vessel，a wire rope for the cargo gear shows signs of excessive wear and must be replaced. In ordering a new wire for this 10-ton boom，what safety factor should you use?（）AThreeBFiveCSixDSeven
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（）.Awinch speedBboom strengthCload radiusDcable strength
单选题The tackle that raises and lowers the boom is（）.Athe cargo fallBThe cargo hoisting wire ropeCthe topping liftDthe cargo whip
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If the cargo gear on your vessel is equipped with a regular guy and a preventer guy，you should（）.Alet the schooner guy take most of the strain，thus transferring the load to the opposite boomBleave the preventer guy slackCsecure them as close together as possible on deckDsecure them so the angle between them is 90°at the boom head
单选题Sudden starts or stops of the boom is likely to cause all of the following except（）.Abreaking a cargo runnerBparting guys topping liftsCcarrying away a blockDoverheating the resistors and eventually burning out
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The jumbo boom can （）.Alift heavy cargoBload and unloadCjoin ropes togetherDlift light cargo
单选题The majority of cargo gear breakdowns are a result of（）.AGuy failuresBTopping lift failuresCBending of the boom from compressionDGooseneck failure
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