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单选题
The crane jib is raised and lowered by means of （）
A
a mooring winch
B
a hoisting winch
C
a slewing winch
D
a luffing winch
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With a given load on the cargo hook，the thrust on a cargo boom ______.A.increases as the angle to the horizontal increasesB.increases as the angle to the horizontal decreasesC.is greatest at an angle of 45° and decreases as the boom is raised or loweredD.is least at an angle of 45° and increases as the boom is raised or lowered
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The lifeboat is lowered to near the water，loaded with the allowed capacity，lowered into the water until afloat，then released from the fallsB
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单选题On no account（）to be exceeded.A
is the SWL of the craneB
are the SWL of the craneC
the SWL of the crane isD
the SWL of the crane are
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单选题Which of the following statements is TRUE regarding crane operations（）.A
Radio communications allow the crane operator to disregard the use of hand signalsB
The crane operators and signalman must be familiar with the correct hand signalsC
The forward cranes can be operated from the bridgeD
The aft cranes can be operated from the aft steering station
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单选题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
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单选题A drawbridge may use visual signals to acknowledge a vessel’s request to open the draw. Which signal indicates that the draw will NOT be opened immediately?（）A
A flashing amber lightB
A fixed red lightC
A white flag raised and lowered verticallyD
A flashing white light
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单选题The boom stops are installed on an offshore crane to（）.A
prevent the boom from being raised too highB
prevent the boom from swingingC
support the boom when not in useD
prevent the boom from being lowered
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单选题Which of the following statements is FALSE concerning cranes being installed on the centerline of vessels（）.A
A centerline crane can never be operated in tandemB
One crane is able to work one end of two adjacent hatchesC
These cranes are more economical and weigh less than outboard-mounted cranesD
One crane is able to work both sides of the ship
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liftC
raiseD
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should be kept at a proper level by a coolerB
should be raised to about 80℃ by a heaterC
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its pressure and temperature are both loweredB
its pressure and temperature are both raisedC
its pressure is lowered and its temperature is raisedD
its pressure is raised and its temperature is lowered
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单选题In a ordinary cargo crane, （） is fitted to rotate the crane.A
the slewing motorB
the lulling motorC
the hoisting motorD
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单选题With a given load on the cargo hook，the thrust on a cargo boom（）.A
increases as the angle to the horizontal increasesB
increases as the angle to the horizontal decreasesC
is greatest at an angle of 45° and decreases as the boom is raised or loweredD
is least at an angle of 45° and increases as the boom is raised or lowered
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单选题In a general cargo crane, （） is fitted to raise or lower the jib.A
the slewing motorB
the luffing motorC
the hoisting motorD
none of the above
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