单选题If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be （）Aa glazed surface on the springBnicks in the protective coatingCa build up of sludge depositsDcracks in the surface of the spring
单选题
If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be （）
A
a glazed surface on the spring
B
nicks in the protective coating
C
a build up of sludge deposits
D
cracks in the surface of the spring
参考解析
解析：
暂无解析
相关考题：
Are you still here? You were here half an hour ago. Who( )for? A、were you waitingB、are you waitingC、did you waitD、do you wait
Springs in fuel injectors will become not strong enough to work because______.A.the injector opens at a lower pressure than designedB.the needle valve and seat wear outC.the nozzle holes wear outD.long time in use
Elephants would( )if men were allowed to shoot as many as they wished.A. die downB．die outC．die awayD．die off
The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler ______.A.steam demand is highB.salinity is highC.safety valve simmers(爆发)D.burner flame is extinguished
Which options must you configure while performing an automated Tablespace Point-in-Time Recovery (TSPITR) by using Recovery Manager (RMAN)?（）A、New channels for restore and recovery tasksB、New name for the data files of the tablespaceC、Auxiliary name for the data files of the tablespaceD、Auxiliary destinations for an auxiliary set of data files
单选题If a refrigeration system compressor crankcase is sweating, you should （）.Aadd refrigerant to the systemBadjust the thermal expansion valve to the proper settingCadjust the float valve to the proper holding pressureDopen the hand expansion valve
单选题After you enter Thimble Shoal Channel，you will alter course to pass between Trestle “A” and “B”. Which channel should you use?（）AThimble Shoal Main Channel or the South Auxiliary ChannelBAny of the channels but keep to the right hand sideCThe South Auxiliary ChannelDThimble Shoal Main Channel
单选题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）Athe engine is overloadedBthe engine is coldCthere is too much lube oil in the cylindersDthe turbocharger is fouled
单选题The（） is fitted in pair one is the main valve, the other the auxiliary or standby.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.Athe inlet valveBthe outlet valveCboth the inlet valve and the outlet valveDthe pump inlet valve
单选题If a centrifugal bilge pump were continually operated with the discharge valve closed the （）.Amotor overload would openBrelief valve would openCpump would eventually overheatDmotor would overheat
单选题If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.Asystem was overcharged with refrigerantBhigh pressure switch was improperly adjustedCexpansion valve strainers were fouledDsuction valves were leaking slightly
单选题If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.Asystem was overcharged with refrigerantBsystem was low on refrigerantCsuction valves were leaking slightlyDrelief valve was leaking slightly
单选题At 0845，you are approaching the entrances to Thimble Shoal Channel. What channel must you use?（）AThe South Auxiliary Channel since your draft is less than 25 feet (7.6 meters)，and you are not a passenger vesselBThe South Auxiliary Channel or Thimble Shoal Channel，but you must remain on the right hand side of the main channelCThe North Auxiliary Channel since you are going to turn to a northerly heading near buoy 12DYou are not permitted to use any of the channels，but must remain outside the buoyed channel line
单选题The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）Aremove any air that may accumulate in the systemBtake out unpleasant fumes from the refrigerantCvent off excess refrigerant in an emergencyDpermit opening the refrigerating system for cleaning and inspecting
单选题Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）Alater and close soonerBsooner and close laterCsooner and close soonerDlater and close later
单选题The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）Aincrease back pressure during the exhaust processBfacilitate periodic replacement of the valvesCreduce the pumping loss associated with scavengingDreduce tension on valve springs
单选题When there is a flame failure in an automatically fired auxiliary boiler, the （）.Aair supply is shut offBfuel supply is shut offCwater supply is shut offDsafety valve lifts
单选题Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）AOver speedBfire improperlyClose oil pressureDoverheatrapidly
单选题Diesel engine valve springs function to （）Ahold the valves openBkeep the valves off their seats until the exhaust stroke is completedCclose the valvesDopen inlet valves when the air injection cycle begins
单选题If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）Alow exhaust back pressureBair in the fuel systemCgasket blow-by or leakageDincorrect assembly of idler springs
单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.Adischarge service valve as a vaporBsuction service valve as a liquidCcharging valve as a liquidDcondenser purge valve as a vapor
单选题If a centrifugal pump were continually operated with the discharge valve closed, the （）.Amotor controller overload would openBpump would eventually overheatCrelief valve would continuously cycle openDmotor would overheat
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）Aworn valve seatsBworn main bearingCexcessive valve clearanceDweak rocker arm springs
单选题While inspecting the steering system at sea, you should check for （）.Aair bubbles in the sight glassBany leaks in the systemCover-travel in the rudder angle indicatorDlost motion in the rams
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）Aone valve seats upwards, while the other seats downwardsBthe reed valves used on the discharge are made substantially thicker and heavier than the suction valvesCthe suction valve springs exert a greater tension than the discharge valve springsDthe discharge valve springs exert a greater tension than the suction valve springs