网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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
参考答案
更多 “ 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 circulationB.a centrifugal counterweight counteracts the force of gravityC.the electric pump motor will cut outD.the control lever will move to the stop position ” 相关考题
考题
Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by ______.A.permanent loss of pump suctionB.worn shaft sealsC.high level in the oil sumpD.low motor RPM
考题
If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor ______．A.when the line pull reaches the rated winch capacityB.after the line pull exceeds the rated winch capacityC.after a short build-up of torqueD.immediately
考题
The item ______ is not the advantage of the hydraulic winch．A.less jerky startsB.less jerky stopsC.overheating worriesD.none of the overheating worries
考题
If an electric cargo winch is being used to lift a draft of cargo and the engine room loses all power，which will occur ________．A.A pawl，forced by a spring mechanism，will engage the teeth of the bull gear and hold the loadB.An electromagnetic brake will hold the load where it is suspendedC.The load will fall rapidly to the deck unless the foot brake is engagedD.The load will slowly lower to the deck under control of the drag of the winch motor
考题
When a winch breaks down，or some similar occurrence makes only one winch available at a hatch，which alternate rig would provide a temporary solution while repairs are made ________．A.Frisco RigB.Split fall rigC.West Coast RigD.Yard and stay jury rig
考题
If one hydraulic pump of an electro-hydraulic steering unit fails, the vessel’s steering can be initially and best maintained by using the ______.A.trick wheelB.accumulatorC.standby pumpD.Telemotor
考题
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.A
ram relief valves bypass oil to stop rudder movementB
six-way valve shifts to the neutral flow positionC
steering pump electric motor is de - energized by the transfer switchD
follow-up gear takes the hydraulic pump off stroke
考题
单选题If the pump for a hydraulic anchor windlass is overheating, the cause may be （）.A
excessive drive motor speedB
excessive pump discharge pressureC
too low of a tilting box angleD
insufficient drive motor speed
考题
单选题Overheating of a hydraulic system may be a result of （）.A
changing pump discharge pressure in response to normal load variationsB
a high oil levelC
incorrect fluid viscosityD
continued slow re-circulation of the oil
考题
单选题When hoisting a boat on gravity type davits using an electric motor driven winch，the davit arms should be brought up（）.A
to their final position with the winch operating at slow speedB
to the bar stop，and then hand cranked to their final positionC
until just before they make contact with the limit switch，and then hand cranked to their final positionD
to the embarkation deck，and then hand cranked to their final position
考题
单选题In cargo crane, （） for lifting the load.A
a hoisting motorB
a luffing motorC
a mooring motorD
a slewing motor
考题
单选题The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to （）.A
transmit the rudder angle to the bridge indicatorB
prevent the control linkage from striking the stops when hard overC
automatically purge all entrained air from the systemD
send hydraulic signals to the receiving unit
考题
单选题If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.A
add fluid that is the same color as the fluid in the reservoirB
add turbine oil because it is always a good substituteC
add any oil that has the same viscosity as the hydraulic fluidD
check the winch manufacturers instruction book
考题
单选题If a hydraulic pump is overheating, the cause may be （）.A
excessive internal leakage in the pumpB
low discharge pressure and fluid flowC
excessive fluid level in the hydraulic reservoirD
operation of the pump at 100% efficiency
考题
单选题In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）A
Constant tension mooring winch systemB
Hatch cover systemC
Watertight door systemD
Internal combustion engine hydraulic starter system
考题
单选题The crane jib is raised and lowered by means of （）A
a mooring winchB
a hoisting winchC
a slewing winchD
a luffing winch
考题
单选题What is TRUE about hoisting operations?（）A
Personnel may work beneath suspended loads，as long as they are alert and wear hard hatsB
If a suspended load with no tag begins to spin，personnel should attempt to stop the spinning if the load is within reachC
If tag lines are used to control a suspended load，they should be secured to the deckD
Personnel not involved in the hoisting operation should be kept clear of the transfer area
考题
单选题If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor（）.A
when the line pull reaches the rated winch capacityB
after the line pull exceeds the rated winch capacityC
after a short build-up of torqueD
immediately
考题
单选题Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）A
permanent loss of pump suctionB
worn shaft sealsC
high level in the oil sumpD
low motor RPM
考题
单选题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 circulationB
a centrifugal counterweight counteracts the force of gravityC
the electric pump motor will cut outD
the control lever will move to the stop position
考题
单选题An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.A
cause loss of hydraulic oil from the systemB
result in extreme damage to the pumpC
cause damage to the pump ff not continually drained from the pump casingD
result in the system high side pressure to substantially drop off
考题
单选题If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.A
increased pump speedB
excessive pump discharge pressureC
too low of a tilting box angleD
low pump speed
考题
单选题In a general cargo crane, （） is fitted to lift the cargo load.A
the slewing motorB
the luffing motorC
the hoisting motorD
none of the above
考题
单选题When retrieving the survival craft，the winch operator should stop the winch and check（）.A
that all personnel are seated in the craftB
that the cable has not jumped any grooves on the drumC
which way the wind is blowingD
the hydraulic fluid level before lifting
考题
单选题As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.A
circularB
ellipticalC
rectangularD
hexagon
考题
单选题If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.A
trick wheelB
accumulatorC
standby pumpD
telemotor
考题
单选题If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.A
a low load on the unitB
a clogged pump suction strainerC
a blockage in the line between the pump and hydraulic motorD
the hydraulic motor turning too fast
考题
单选题The item（）is not the advantage of the hydraulic winch．A
less jerky startsB
less jerky stopsC
overheating worriesD
none of the overheating worries
热门标签
最新试卷
