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单选题
Stress on the topping lift of a swinging boom can be reduced by（）.
A
rigging a back stay
B
raising the boom
C
increasing the mechanical advantage of the cargo purchase
D
taking all slack out of the preventer
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更多 “单选题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” 相关考题
考题
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
考题
A band or collar on the top end of a boom to which the topping lift，midships guy，and outboard guys are secured，is called the ______.A.collar bandB.guy bandC.pad eye collarD.spider band
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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
考题
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
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
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
考题
Which part provides for transverse control and positioning of a boom in a conventional yard and stay system ________．A.GuyB.ShroudC.SpiderD.Topping lift
考题
As the pace of life continues to increase ,we are fast losing the art of relaxation. Once you are in the habit of rushing through lift,being on the go from morning till night, it is hard to slow down.
But relaxation is essential for a healthy mind and body.Stress is an natural part of everyday lift and there is no way to avoid it. In fact ,it is not the bad thing it is often supposed to be .A certain amount of stress is vital to provide motivation adn give purpose to life. It is only when the stress gets out of control that it can lead to poor performance and ill health.
The amount of stress a person can withstand depends very much on the individual. Some people are not afraid of stress,and such characters are obviously prime material for managerial responsibilities. Others lose heart at the first signs of unusual difficulties. When exposed to stress,in whatever form,we react both chemically and physically. In fact we make choice between "fight" or "flight" and in more primitive days the choice made the difference between life or death. The crises we meet today are unlikely to be so extreme,but however little the stress,it involves the same response. It is when such a reaction lasts long,through continued exposure to stress,that health becomes endangered.Such serious conditions as high blood pressure and heart disease have established links with stress.Since we cannot remove stress from our lives(it would be unwise to do so even if we could),we need to find ways to deal with it.
Which of the follwing statements is ture?a.We can find some ways to avoid stress
b.Stress is always harmful to people
c.It is easy to change the hagit of keeping oneself busy with work.
d.Different people can withstand different amounts of stress
考题
The jumbo boom can （）.A、lift heavy cargoB、load and unloadC、join ropes togetherD、lift light cargo
考题
The （）(双杆联吊) is that two booms are used with a single hook.A、derrickB、union purchaseC、topping lift blockD、crane
考题
The （）(千斤滑车) can run the gooseneck.A、heavy derrickB、pulley blockC、topping lift blockD、guy tackle
考题
单选题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
考题
单选题A flounder plate，on a topping lift，is（）.A
a fairlead blockB
a swivel pin for the topping lift blockC
a triangular steel plate with a hole at each cornerD
the lower block of a multiple part topping lift
考题
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
考题
单选题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
考题
单选题A band or collar on the top end of a boom which the topping lift, midships guy, and outboard guys are secured, is called the（）.A
collar bandB
guy bandC
pad eye collarD
spider band
考题
单选题Structural stress on a ship can be reduced by（）.A
lessening the effect of environmental forcesB
even and symmetrical variable loadingC
local concentration of heavy consumablesD
increasing the metacentric height
考题
单选题A tackle by which the outer end of a boom is raised and lowered is the topping（）.A
boomB
liftC
raiseD
tackle
考题
单选题The tackle that raises and lowers the boom is（）.A
the cargo fallB
The cargo hoisting wire ropeC
the topping liftD
the cargo whip
考题
单选题For a given weight of cargo，the stress on the heel block of a cargo boom（）.A
increases as the cargo closes the head while hoistingB
increases if the cargo runner is doubled upC
decreases as the boom is topped to a greater angleD
is determined by the thrust stresses on the boom
考题
单选题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
考题
单选题A virtual rise in the center of gravity may be caused by（）.A
filling a partially filled tankB
using an on board crane to lift a freely swinging heavy objectC
emptying a partially filled tankD
transferring ballast from the forepeak to the after peak
考题
单选题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
考题
单选题The majority of cargo gear breakdowns are a result of（）.A
Guy failuresB
Topping lift failuresC
Bending of the boom from compressionD
Gooseneck failure
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A single heavy wire made up for the topping lift is called a（）.A
baleB
spanner wireC
bull lineD
working guy
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