A.Shortage of refrigerant oil
B.Slight shortage of refrigerant
C.Excessive condenser cooling water flow
D.Faulty expansion valve
[单选题]Which of the listed conditions can be considered as the single greatest cause of accidents?A.SpeedB.Excessive knowledge or skillC.Human errorD.Excitement
[单选题]Which of the listed conditions can be considered as the single greatest cause of accident?A.SpeedB.Excessive knowledge or skillC.Human errorD.Excitement
[单选题]Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?()A . Defective temperature controls in the systemB . Cavitation in the cooling water pumpC . Opened vent in the cooling s
[单选题]Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?A.ViscosityB.Sulfur contentC.Pour pointD.Cetane number
[单选题]Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?()A . ImpuritiesB . Lube oilC . GasolineD . Diesel fuel
[单选题]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
[单选题]Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?A.Cooling the air to a temperature just above dew pointB.Heating the air to a point at which mo
[单选题]Which of the units listed is used to combust waste in the engine room?A.BoilerB.IncineratorC.Generator
[单选题]Which of the listed fire extinguishers cannot be easily recharged aboard ship?A.Soda acidB.Carbon dioxideC.Dry chemicalD.cartridge-operated Foam
[单选题]Which of the listed devices may be used as a digital device?A.variable resistorB.diodeC.strain gaugeD.thermistor