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单选题
Limit switches on gravity davits should be tested by（）.
A
the engineers，from a panel in the engine room
B
shutting off the current to the winch
C
pushing the switch lever arm while the winch is running
D
All of the above
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单选题The maximum speed of lowering for a lifeboat on gravity davits is controlled by the（）.A
limit switchesB
emergency disconnect switchC
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They must be released by freeing a safety shackleB
They should not be released until the boat is in lowering positionC
They may be adjusted by a turnbuckleD
They are normally used only with radial davits
考题
单选题Limit switches（）.A
control the descent rate of a lifeboatB
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cut off power to the winch when the lifeboat nears the final stowed positionD
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考题
单选题What is the purpose of the limit switch on gravity davits?（）A
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None of the above
考题
单选题Which of the following statements describes the relationship between viscosity and specific gravity?（）A
Liquids with different viscosities will always have the same specific gravityB
Liquids with different viscosities will never have the same specific gravityC
Viscosity and specific gravity are directly proportionalD
Viscosity and specific gravity are not related in that one does not define or limit the other
考题
单选题When a survival craft drill is held，the person in charge must insure that（）.A
all survival craft are lowered to the water，launched，and operated for thirty minutesB
all davits used for launching liferafts are operatedC
each emergency position indicating radio beacon is tested for thirty minutesD
the helicopter pad landing lights are operating in a quick-flashing mode
考题
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hourB
dayC
weekD
month
考题
单选题Which sequence is correct when launching a lifeboat stowed in gravity davits?（）A
Release gripes，turn on emergency disconnect switch，release frapping linesB
Release tricing pennants，turn on emergency disconnect switch，release frapping linesC
Operate limit switches，release gripes，lift brakeD
Release gripes，lift brake，release tricing pennants
考题
单选题Limit switches are used on which davits?（）A
Sheath-screw davitsB
Gravity davitsC
Radial davitsD
Quadrantal davits
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