单选题Blow-off of the relief valves of the main cylinders during operation indicates （）.Athe cylinder cover is crackedBthe injector holes is cloggedCthe cams are not properly setDfuel pump is leaking
单选题
Blow-off of the relief valves of the main cylinders during operation indicates （）.
A
the cylinder cover is cracked
B
the injector holes is clogged
C
the cams are not properly set
D
fuel pump is leaking
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
Rudder position is shown on the bridge by the .A.rudder angle indicatorB.follow-up gearC.telemotor positionD.relief valves
Vee-type engines have the connecting rods from two cylinders connected to each _____ of the crankshaft.A.throwB.webC.main bearingD.deflection
A fire pump may be used for other purposes if ______.A.the other services are run off a reducing station with a pressure gageB.one of the required pumps is kept available for use on the fire main system at all timesC.no relief valves are installedD.all of the above conditions are met
How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?A.With gooseneck ventsB.With warning signsC.With flame screensD.With pressure-vacuum relief valves
Cargo pump relief valves are piped to the ______．A.cargo pump pressure gaugesB.crossover lines interconnecting two pumpsC.suction side of pumpsD.atmosphere through pump vents
What is the purpose of pressure-vacuum relief valves ________．A.Regulation of discharge pressure from cargo pumpsB.Maintaining constant velocity in cargo linesC.Regulation of suction head on cargo pumpsD.To maintain a tank or void at atmospheric pressure
All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．A.Set the relief valveB.Check the lubrication systemC.Vent the pump casingD.Open the pump suction and discharge valves
单选题Cargo pump relief valves are piped to the（）.Acargo pump pressure gaugesBcrossover lines interconnecting two pumpsCsuction side of pumpsDatmosphere through pump vents
单选题Valve overlap is the period during which （）.Athe inlet valve is openBthe exhaust valve is openCboth valves are closedDboth valves are open
单选题Most hydraulic steering gears are fitted with relief valves which（）Afunction when the rudder is amidshipsBrelieve excess whip pressure from the hydraulic oil systemCprotect the piping assembly from external rudder shockDrelieve excessive telemotor pressure
单选题The purpose of the safety relief valves installed on an auxiliary boiler is to （）.Arelieve excess fuel oil pressure during the “off” fire cycleBadmit water to the dry pipeCthrottle the forced draft fan output for proper combustionDreduce excess steam pressure in the boiler
单选题The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）Aquantity of air it takes in and retains in the cylinders during a given time periodBproportion of trapped air that is utilized in the combustion processCthermodynamic efficiency of the engine cycleDall of the above
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All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.Aset the relief valveBcheck the lubrication systemCvent the pump casingDopen the pump suction and discharge valves
单选题Overload protection on hydraulic system is provided by the use of （）.Astop valvesBpressure relief valvesCbalance valvesDregulating speed valves
单选题Blow-off of the relief valves of the engines cylinders may be caused by （）.Atoo low leadBwater in fuelCtoo tight springDleakage
单选题A fire pump may be used for other purposes if（）.Athe other services are run off a reducing station with a pressure gageBone of the required pumps is kept available for use on the fire main system at all timesCno relief valves are installedDall of the above conditions are met
单选题During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）AFlywheel inertiaBAdmission of starting airCThe way of the vesselDsecuring of fuel to the cylinders
单选题Hydraulic cranes must be properly warmed-up before being operated because （）.Awarm-up allows the hydraulic system to become charged with oilBwarm-up allows the relief valves to be properly testedChydraulic strainers operate only during the warm-up periodDhydraulic fluid must be at the proper viscosity
单选题Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the （）.Aexhaust gas temperature systemBexhaust load systemCconstant or pulse pressure systemDconstant volume system
单选题If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）Abackfire through the air intakesBdevelop less power under loadChave high firing pressuresDlift its cylinder relief valves
单选题When air becomes trapped in the hydraulic fluid of a steering system, the （）.Arudder will respond sluggishlyBhydraulic rams will over-speedCsight glass will show bubblesDram relief valves will lift
单选题During （）, the starting air valves should be closed to prevent the engine from turning.AoverhaulBrunningCblowing downDAll of the above are correct
单选题The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.Afuel valves of main engineBinjector pump of main engineCsafety valves of marine boilerDsafety valves of a reciprocating pump
单选题In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.Athe beveled edges of the intake valves provide for serf-centering during seatingBintake valves utilize stellite-coated valve seat inserts which reduce wearCthe volume of air passing through intake valves is less than the volume of air passing through exhaust valvesDintake valves are less affected to the corrosive action of exhaust gases
单选题The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.AcrackBknockingCleakingDseizure