海船船员考试
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
题目
rigging a back stay
raising the boom
increasing the mechanical advantage of the cargo purchase
taking all slack out of the preventer
相似问题和答案
第1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 increases
B.is at a maximum when the boom is at a 45° angle to the horizontal
C.increases as the boom's angle to the horizontal decreases
D.decreases as the boom's angle to the horizontal decreases
第2题：
What does “evel-luffing” accomplish during crane operations ________．
A.It prevents the load from swinging when the boom level is adjusted
B.Less power is needed when topping the boom with a load on the hook
C.It maintains the height of the load above the deck
D.All of the above
第3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
回转式吊杆减小千斤索的拉力可通过升起吊臂。
第4题：
topping lift（）
- A、千斤索
- B、定位滑车
- C、稳索
- D、千斤顶
正确答案:A
第5题：
Which part provides for transverse control and positioning of a boom in a conventional yard and stay system ________．
A.Guy
B.Shroud
C.Spider
D.Topping lift
第6题：
The boom stops on a pedestal crane prevent the boom from ______.
A.being raised too high
B.swinging at sea
C.overloading when not in use
D.being lowered too low
第7题：
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
第8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 band
B.guy band
C.pad eye collar
D.spider band
一个结在吊杆顶端的末端，千斤索、中稳索、边稳索系固处，被叫做蜘蛛结。
第9题：
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?
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
第10题：
The jumbo boom can （）.
- A、lift heavy cargo
- B、load and unload
- C、join ropes together
- D、lift light cargo
正确答案:A