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What is meant by the term“luffing the boom”of a crane ________．
A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
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更多 “ 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 ” 相关考题
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2 The activities of an organisation have to be managed and co-ordinated to ensure that its objectives are met. The organisation’s structure is designed to support this.Required:(a) What is meant by the term ‘organisational structure,’ often shown as an organisation chart? (5 marks)
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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
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In a ordinary cargo crane, ______is fitted to rotate the crane.A.the slewing motorB.the luffing motorC.the hoisting motorD.the fan motor
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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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The boom stops on a pedestal crane prevent the boom from ______.A.being raised too highB.swinging at seaC.overloading when not in useD.being lowered too low
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Which statement is FALSE regarding the operation of a crane ________．A.The crane jib is raised and lowered by the luffing winchB.The cargo block is raised and lowered by the hoisting winchC.The cargo block is raised and lowered by the luffing winchD.None of the above
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For any given pedestal crane，when the boom is lengthened，the lifting capacity is ______．A.unchangedB.increasedC.eliminatedD.decreased
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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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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
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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
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单选题The （）(笨重货) must be handled by jumbo boom or shore crane.A
awkward cargoB
drummed cargoC
cased cargoD
heavy cargo
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单选题For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.A
unchangedB
increasedC
eliminatedD
decreased
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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
raise the boomB
raise the hookC
raise the boom and hookD
check the boom stop
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单选题In cargo crane, （） for lifting the load.A
a hoisting motorB
a luffing motorC
a mooring motorD
a slewing motor
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单选题What is meant by the term TOPPING THE BOOM?（）A
Lowering the boomB
Raising the boomC
Spotting the boom over the deckD
Swinging the boom athwartships
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单选题The boom stops on a pedestal crane prevent the boom from（）.A
being raised too highB
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
Stopping the boomB
Topping or lowering the boomC
Moving the boom left or rightD
All of the above
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单选题What is meant by the term “broaching to”? （）A
Having the vessel head toward the seaB
Running before a seaC
Being turned broadside to the seaD
Having the vessel filled with water
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单选题What is meant by the term two-blocked（）.A
The bottom block touches the top blockB
The line has jumped the sheavesC
There are turns in the fallD
You have two blocks
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单选题What is meant by the term overhaul in firefighting?（）A
Slow down the spread of fire by cooling adjacent structuresB
Cover the fire with foamC
Smother the fire with a blanket or similar objectD
Break up solid objects to ensure that any deep seated fires are extinguished
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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
考题
单选题In a general cargo crane, three principal movements are （）； （）； （）.A
hoisting；luffing；slewingB
lifting；raising；loweringC
rotating；raising；handlingD
hosting；lowering；moving
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单选题In a general cargo crane, （） is fitted to raise or lower the jib.A
the slewing motorB
the luffing motorC
the hoisting motorD
none of the above
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单选题What is meant by spotting the boom?（）A
Lowering it into a cradleB
Placing it in a desired positionC
Spotting it with wash primer and red leadD
Two-blocking it
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单选题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
考题
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
boom stop angleD
minimum radius angle
考题
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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