A.Moving high weights lower
B.Adding weight at the tipping center
C.Moving a weight forward
D.Moving lower weight high
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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
A.Use one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signa
B.Extend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desired
C.First tap your elbow with one hand and then proceed to use regular signals
D.First tap the top of your head with your fist and then proceed to use regular signals
A.the speed to be retarded by the friction brake
B.a load to go downward at full speed
C.the circuit breaker to turn off
D.the resistors to overheat and eventually burn out
A.Ensure that slings are securely fastened around the load
B.Avoid careless winch operations，especially when handling fragile cargo
C.Exercise care when using hooks，crowbars，and similar tools
D.Keep the loads as close to the rail or deck as possible
A.It allows for rotation of the hook in the single mode
B.It is required to“twin-up”30-ton pedestal cranes
C.It is used to pick up light loads
D.It is used to rigidly connect two cranes
A.Cranes are able to pick up and drop loads over a greater spotting area
B.Increased safety because the deck is clear of running and standing rigging
C.Simplicity of operation of the crane by its operator
D.All of the above
A.Extend arm and point finger in the direction to move the boom
B.Extend arm with thumb pointing downward and flex fingers in and out
C.With forearm vertical and forefinger pointing up，move hand in small horizontal circles
D.With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
A.Should not exceed
B.Must be up to
C.Should exceed
D.Should be about
A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
A.Cranes are more difficult to secure for sea
B.The spotting area of the conventional gear is larger
C.A crane operator requires more training than the winch operator of a yard and stay rig
D.The yard and stay rig is more flexible in its ability to handle a wider variety of cargoes
最新試題
Damage by（）shall not be considered as handling damage.
When discharging oil from an oil tanker the instantaneous rate（）60 liters per nautical mile.
Which statement comparing a shipboard crane to conventional gear is TRUE（）.
When instructing a crew member concerning the right way to lift a weight，you would instruct him to（）.
Which statement is FALSE concerning a tagline as used with a 30-ton pedestal crane（）.
When using slings，cargo handlers should take all the following precautions except（）.
The item（）is not the advantage of the hydraulic winch．
What is/are the advantage（s）of cranes over conventional cargo booms（）.
What is meant by the term“l(fā)uffing the boom”of a crane（）．
When viewed from above，the best position for the guy in relation to the boom is（）.