更多"Sudden starts or stops of the boom "的相关试题:
[单项选择]The boom stops are installed on an offshore crane to（）.
A. prevent the boom from being raised too high
B. prevent the boom from swinging
C. support the boom when not in use
D. prevent the boom from being lowered
[单项选择]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
[单项选择]A boom vang（）.
A. holds the boom down and flattens the main sail
B. draws the head of the sail to windward
C. tautens the standing rigging
D. douses the gaff topsail
[单项选择]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
[单项选择]Our jumbo boom can（）20 tons.
A. lift
B. rise
C. elevate
D. hoist
[单项选择]The boom indicator tells the operator at what angle the boom is compared to the（）.
A. horizontal position of the boom
B. vertical position of the boom
C. horizontal position of the load being lifted
D. vertical position of the load being lifted
[单项选择]If a hydraulic pump on a winch accidentally stops while hoisting，the load will stay suspended because（）.
A. a check valve will close that prevents reverse circulation
B. a centrifugal counterweight counteracts the force of gravity
C. the electric pump motor will cut out
D. the control lever will move to the stop position
[单项选择]A shipmate suffers a heart attack and stops breathing. You must（）.
A. administer oxygen
B. immediately check his pulse and start CPR
C. make the victim comfortable in a bunk
D. immediately give a stimulant，by force if necessary
[单项选择]0ur jumbo boom can（）20 tons.
A. lift
B. rise
C. elevate
D. hoist
[单项选择]The process of lowering a boom to a horizontal position and onto its deck support is called（）.
A. spotting a boom
B. collaring a boom
C. cradling a boom
D. toppling a boom
[单项选择]What is meant by spotting the boom?（）
A. Lowering it into a cradle
B. Placing it in a desired position
C. Spotting it with wash primer and red lead
D. Two-blocking it
[单项选择]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
[单项选择]The fitting that allows a boom to move freely both vertically and laterally is called the （）.
A. swivel
B. lizard
C. spider band
D. gooseneck
[单项选择]Boom Box爆炸机开机的操作是（）
A. 向中间扳动ARM
B. 同时扳动ARM+CHARGE
C. 扳动CHARGE
D. 接通电源自动开机
[单项选择]For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.
A. unchanged
B. increased
C. eliminated
D. decreased
[单项选择]The hinge fitting used to attach the boom to the mast is the（）.
A. gooseneck
B. step
C. swivel
D. pintle
