单选题Winch gears must be maintained in proper alignment to prevent ().Aoverheating of the lube oilBover-speeding of the motorCwear on the braking systemDdamage to the teeth
单选题
Winch gears must be maintained in proper alignment to prevent ().
A
overheating of the lube oil
B
over-speeding of the motor
C
wear on the braking system
D
damage to the teeth
参考解析
解析:
暂无解析
相关考题:
In America, which of the following is NOT the requirement for the students wanting to get their driver's license?A. They must be 16 years old.B. They should go to have their driver's test.C. They must reach the proper age to drive.D. They ought to do well in their driver's course.
Why is it necessary to have routine testing of the cooling water?A.To ensure that the proper residuals of treatment chemicals, as specified, are maintained all timeB.To trace leakage in the cooling water systemC.It is not necessaryD.To detect the presence of contaminants in the water that may be injurious to the cooling system
A seaman may have all or part of his wages deposited by allotment to a bank or savings institution. Which of the following is NOT a requirement for this type of allotment?A.The account must be either a checking or savings accountB.The institution must be insured by the FSLIC or FDICC.The account must be opened by the seaman and maintained in the seaman's nameD.All of the above are requirements
Electrical wiring on all "T-Boats" must be ______.A.concealed to prevent mechanical damageB.concealed so the boat can be maintained more easilyC.protected from the weatherD.in an accessible place behind the ceiling
What could be a result of insufficient lubrication of lifeboat winches and davits ________.A.Moisture accumulation in winch motor damaging the electrical wiringB.Freezing of gears in cold weatherC.Corroding of sheaves on the davits so they will not rotateD.All of the above
A proper look-out shall be maintained ______.A.only at nightB.only during restricted visibilityC.at night and during restricted visibilityD.at all times
起货机出故障时,水手要去叫电工来修理。()A、When the windlass is in trouble, the sailor must go and call the electrician to repair it.B、When the derrick is in trouble, the sailor must go and call the electrician to repair it.C、When the winch is in trouble, the sailor must go and call the electrician to repair it.D、When the winch is in trouble, the sailor must go and call the carpenter to repair it.
Which two are characteristics of RSVP? ()A、 RSVP itself provides bandwidth and delay guarantees.B、 For RSVP to be end-to-end, all devices must support RSVP.C、 RSVP reservations are maintained by a centralized reservations server.D、 An RSVP compatible QoS mechanism must be used to implement guarantees according to RSVP reservations.
单选题What could be a result of insufficient lubrication of lifeboat winches and davits?()AMoisture accumulation in winch motor damaging the electrical wiringBFreezing of gears in cold weatherCCorroding of sheaves on the davits so they will not rotateDAll of the above
单选题In determining that the()of the navigational watch is adequate to ensure that a proper look-out can continuously be maintained,the master shall take into account all relevant factors.AdispositionBcompositionCrepositionDposition
单选题The clutch band of a constant tensioning mooring winch must be set up tight enough to drive the winch drum and should slip only when ().Aexcessive loads are placed on the winchBminimum pull is being exerted by the winchCautomatic operation of the winch is desiredDwire is being retrieved at the maximum rate
单选题When the winch is in trouble, the sailor must call the ()(电工) to repair it.AcarpenterBratingCelectricianDbosun
单选题Winch gears must be maintained in proper alignment to prevent ().Aoverheating of the lube oilBover-speeding of the motorCwear on the braking systemDdamage to the teeth
单选题A safe fuel system must().Aprevent engine overheatingBhave proper air/gasoline fuel mixture ratioCbe liquid- and vapor-tightDsupply sufficient air to the intake manifold
单选题The purpose of the wearing rings used in a centrifugal pump is to ().Aprevent an internal explosion in the pump when it is overheatedBenable a visual inspection of the pump while it is runningCinsure a proper alignment of the pump coupling to the driverDaccommodate for friction between the impeller and the easing
单选题On a large diesel engine installation, crankshaft axial alignment is maintained by the ()Apiston rod guidesBengine thrust bearingCcrosshead bearingDmain shaft flexible coupling
单选题A proper look-out shall be maintained().Aonly at nightBonly during restricted visibilityCat night and during restricted visibilityDat all times
单选题The look-out must be able()full attention to the()of a proper look-out.Ato give/keepBgiving/keepingCgiving/keepDto give/keeping
单选题For proper operation, auxiliary boiler feed water must have which of the following characteristics?()AHigh oxygen concentrationBLow pHCProper alkalinityDAll of the above
单选题Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear()Amust churn the oil in the sumpBis connected to the propeller shaftCis driven at the highest RPMDcompensates for alignment variations between the engine and pinion gear
单选题To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the ().Ashaft and impellerBmotor and pump shaftCcasing and impeller wearing ringsDlantern ring and impeller
单选题The bedplate must be rigid enough to support the weight of the rest of the engine, and maintain the crankshaft, which sits in the bearing housings in the (), in alignment.Alongitudinal girdersBtransverse girdersCfore girdersDaft girders
单选题In using reduction gears to obtain efficient propeller speeds, ().Athey must be located at the after end of the engineBthey can only be used with one engine at a timeCthey eliminate the need for controllable pitch propellersDthey are connected to the engine with a flexible coupling
单选题When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance(loosely fitted) bolts in other locations √This is done to ()Amaintain alignment when the ship’s hull is working in heavy seasBensure engine vibrations correspond to the natural frequency of the hullCpermit the engine to expand away from the driven equipment as the engine heats up and expandsDmaintain engine thrust bearing clearances
单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?()AThe coolant temperature must be maintained at 180℃BThe thermostatic bypass valves must be manually opened before the engine is startedCThe pressure cap must be removed while the engine is securedDElectrical power to the heater must be secured before the cooling system is drained
单选题Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?()ACorrect the cause of the scoring and repair the sleeve or replace with a new oneBReassemble the unit and provide more water leak off for proper lubricationCCheck for parallel alignment of the sleeve radial faces to the sleeve boresDReassemble the unit and adjust the governor to obtain a slower speed
单选题A seaman may have all or part of his wages deposited by allotment to a bank or savings institution. Which of the following is NOT a requirement for this type of allotment? ()AThe account must be either a checking or savings accountBThe institution must be insured by the FSLIC or FDICCThe account must be opened by the seaman and maintained in the seaman's nameDAll of the above are requirements
单选题Electrical wiring on all “T-Boats” must be()。Aconcealed to prevent mechanical damageBconcealed so the boat can be maintained more easilyCprotected from the weatherDin an accessible place behind the ceiling