单选题Which of the valves listed should be used either in the fully opened or the fully closed position?（）AA gate valveBA globe valveCAny check valveDAny needle valve
单选题
Which of the valves listed should be used either in the fully opened or the fully closed position?（）
A
A gate valve
B
A globe valve
C
Any check valve
D
Any needle valve
参考解析
解析：
暂无解析
相关考题：
Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?A.Pressure-reducing valveB.Unloading valveC.Counterbalance valveD.Pressure-relief valve
Which of the units listed is used to combust waste in the engine room?A.BoilerB.IncineratorC.Generator
Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?A.Signaling that all personnel are clear before lifting or lowering materialB.Examining material for sharp edges or protruding points before handlingC.Closing, tagging or securing valves that permit entrance of steam, water, or air into a fitting or other equipmentD.Throwing materials from high places to the deck
Which of the listed devices may be used as a digital device?A.variable resistorB.diodeC.strain gaugeD.thermistor
Which of the listed devices is used to measure pressure and convert it to an electrical signal?A.TransducerB.ReducerC.TransformerD.Rectifier
Which of the following is correct regarding full-state backups?（）A、used for either a single or dual UCS catastrophic failureB、can be restored with no special requirementsC、stored as gzipped tarballD、easy to modify as needed
When running IP SLA， which application type should be used if you want to know round-trip delay， jitter， and packet loss for the full path？（）A、ICMP path echoB、UDP echoC、ICMP path jitterD、Application Performance MonitorE、TCP connect
A systems administrator has a high performance server with a file share full of data that has not been used in a long time， but is still important and might be used in the future. Which of the following should they do to reclaim the space off the high performance server？（）A、Audit the dataB、Delete the dataC、Back up the dataD、Archive the data
A company has just implemented a disaster recovery plan in which critical business must be restored in a four hour window. Which of the following methods should be used to backup theservers？（）A、Incremental backupB、Data only backupsC、SAN replicationD、Full backup
单选题Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）APressure-reducing valveBUnloading valveCCounterbalance valveDPressure-relief valve
单选题To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）ASpeed limiting governorBOver-speed governorCOver-speed tripDOver-speed relay
单选题Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）ASpring-centered valveBUnloading valveCThree-position valveDTwo-position valve
单选题In order to accurately measure very low pressures, which of the instruments listed should be used?（）ACompound gageBBonrdon tubeCManometerDDeadweight gage
单选题Which of the following statements concerning butterfly valves is correct?（）ASpecial tools are required for lapping or grindingBIt is impossible to throttle flow with a butterfly valveCTo close the valve, it is only necessary to turn the handle a quarter of a turnDThe butterfly valve should never be used in a freshwater system
单选题Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）APlugged injector nozzlesBExcessive fuel injectionCVery late injection timingDIncorrect crankshaft clearance
单选题Which method should be used to warm up the pump turbines prior to discharge（）.ALock the turbine rotor and slowly bleed in steam until operating temperature is reachedBRun the pump at high speed with the discharge valves closedCRun the turbine at slow speed with the pump disconnectedDShut the discharge valve and run the pump at slow speed
单选题Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）ATransducerBReducerCTransformerDRectifier
单选题On a vessel，if someone fell overboard and you did not know over which side the person fell，you should（）.Aimmediately reverse the enginesBstop the propellers from turning and throw a ring buoy over the sideCincrease speed to full to get the vessel away from the personDfirst put the rudder hard over in either direction
单选题An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus （）AThe breaker should be closed when one synchronizing lamp is dark and the other is brightBThe breaker should be closed when both synchronizing lamps are brightCThe frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the busDA portable phase sequence indicator must be used to verify the information from the lamps
单选题Which of the listed statements is correct concerning the starting of centrifugal pumps?（）AThey should always be started with the discharge valve closedBThey should always be started with the discharge valve openedCA priming pump is always required to flood the impeller suctionDThey should always be started with the sealing line valves closed
单选题Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）ACopperBCopper and carbonCCarbonDBronze
单选题Which of the combustion parameters listed is used in a diesel engine, but NOT related to the injection system?（）AAtomizationBMeteringCEffective strokeDPenetration
单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）AAt the designed operating temperature, the liquid refrigerant charge has changed to a vaporBThe liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityCThe sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureDThe sensing bulb is never emptied of liquid refrigerant under normal operating conditions
单选题Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?（）Asignaling that all personnel are clear before lifting or lowering materialBExamining material for sharp edges or protruding points before handlingCClosing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipmentDThrowing materials from high places to the deck
单选题Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）AThe expansion tank should be topped offBThe thermostatic water regulating valves should be manually openedCThe fuel filters should be changedDThe engine should be turned over slowly with the indicator cocks open
单选题When running IP SLA， which application type should be used if you want to know round-trip delay， jitter， and packet loss for the full path？（）AICMP path echoBUDP echoCICMP path jitterDApplication Performance MonitorETCP connect
单选题Your vessel is off a lee shore in heavy weather and laboring. Which action should you take?（）.APut the sea and wind about two points on either how and reduce speedBHeave to in the trough of the seaCPut the sea and wind on either quarter and proceed at increased speedDPut the bow directly into the sea and proceed at full speed