网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
The greatest strain，when lifting a load with the jumbo purchase，is on ______．
A.all of the parts，dividing the load equally
B.the hauling part because it must absorb the frictional losses of all the sheaves
C.the parts in the movable block
D.the standing part because it is directly connected to the weight
参考答案
更多 “ The greatest strain，when lifting a load with the jumbo purchase，is on ______．A.all of the parts，dividing the load equallyB.the hauling part because it must absorb the frictional losses of all the sheavesC.the parts in the movable blockD.the standing part because it is directly connected to the weight ” 相关考题
考题
What feature of “body language”mentioned in the passage is common to both humans and animals?A.Lifting beads when sad.B.Keeping long faces when angry.C.Bristling hair when ready to attack.D.Bowing heads when willing to obey.
考题
To safeguard the operator and other personnel working on or near a hoisting operation, which of the following precautions should be observed?A.Keep a load on the hoist until all personnel are finished workingB.Set the load on a movable dolly when transportation may be neededC.Have one man keep a hand on the load to steady itD.Insure that the lifting gear capacity is not exceeded
考题
Among the rings of a piston the ______one is subjected to the greatest load and temperature.A.bottomB.middleC.topD.any position
考题
Which safety precaution（s）should be observed during crane operations ________．A.Checking for proper lifting from beneath the load during cargo operationsB.Using the proper slings or other lifting devices during cargo operationsC.Relaying communications to port agents on the pier during cargo hoistsD.All of the above
考题
The preventer guy，as used on a conventional yard and stay rig，______．A.Is rigged at an angle of 70° to 90° from the guy it assistsB.Takes the strain imposed on the schooner guy when burtoning cargoC.Is rigged when lifting cargo that exceeds the SWL of a single whipD.Should take the strain if the regular guy parts
考题
For any given pedestal crane，when the boom is lengthened，the lifting capacity is ______．A.unchangedB.increasedC.eliminatedD.decreased
考题
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
When loading a tanker，you should ______．A.load only one tank at a timeB.keep the seamen on watch on standby in the mess roomC.keep a strain on the loading hosesD.close valves by closing them down，reopening one or two turns，and re-closing
考题
An on-load release system on a survival craft means the cable can be released ______.A.only when the load is taken off the cableB.only when there is a load on the cableC.only when activated by the controls at the lowering stationD.at any time
考题
The jumbo boom can （）.A、lift heavy cargoB、load and unloadC、join ropes togetherD、lift light cargo
考题
The （）(浮吊) can float on water used to load and unload the cargo.A、floating craneB、jumbo boomC、union purchaseD、crane
考题
单选题In cargo crane, （） for lifting the load.A
a hoisting motorB
a luffing motorC
a mooring motorD
a slewing motor
考题
单选题When the derrick changes its （）(角度), its lifting capacity changes correspondingly.A
angelB
lengthC
heightD
angle
考题
单选题Generally, when lifting an inflatable life raft back aboard ship you would use the（）.A
towing bridleB
main weather coverC
external lifelinesD
righting strap
考题
单选题For any given pedestal crane，when the boom is lengthened，the lifting capacity is（）.A
unchangedB
increasedC
eliminatedD
decreased
考题
单选题The greatest strain，when lifting a load with the jumbo purchase，is on（）.A
all of the parts，dividing the load equallyB
the hauling part because it must absorb the frictional losses of all the sheavesC
the parts in the movable blockD
the standing part because it is directly connected to the weight
考题
单选题The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.A
decelerating when lowering the loadB
decelerating when raising the loadC
lowering the load at constant speedD
raising the load at constant speed
考题
单选题Any friction fit, tightness or adhesion of the part of any load being lifted should be broken by wedge or tapping and not by increasing the load on the applianceAccording to this sentence, （）A
the lifting appliance can always lift the freight within its rated loadB
attention should be paid in order not to break the wedge when lifting cargoC
sometimes the lifting work needs other assistance other than the lifting applianceD
lifting work should be done with every part fit, tightness or adhesion
考题
单选题To safeguard the operator and other personnel working on or near a hoisting operation which of the following precautions should be observed?（）A
Keep a load on the hoist until all personnel are finished workingB
Set the load on a movable dolly when transportation may be neededC
Have one man keep a hand on the load to steady itD
Insure that the lifting gear capacity is not exceeded
考题
单选题The preventer guy，as used on a conventional yard and stay rig，（）.A
is rigged at an angle of 70°to 90°from the guy it assistsB
takes the strain imposed on the schooner guy when burtoning cargoC
is rigged when lifting cargo that exceeds the SWL of a single whipD
should take the strain if the regular guy parts
考题
单选题A spreader bar is used to（）.A
increase the lifting capacityB
increase the lifting radiusC
protect the slingsD
protect the upper part of a load
考题
单选题An on-load release system on a survival craft means the cable can be released（）.A
only when the load is taken off the cableB
only when there is a load on the cableC
only when activated by the controls at the lowering stationD
at any time
考题
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Generally，when lifting an inflatable liferaft back aboard ship you would use the（）.A
towing bridleB
main weather coverC
external lifelinesD
righting strap
热门标签
最新试卷
