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单选题
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
A
Thermal expansion valve frozen open
B
Suction gas heat exchanger bypassed
C
Condenser clogged or fouled
D
High pressure cutout switch inoperative
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更多 “单选题Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）A Thermal expansion valve frozen openB Suction gas heat exchanger bypassedC Condenser clogged or fouledD High pressure cutout switch inoperative” 相关考题
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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
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Which of the problems listed could cause erosion of the expansion valve disks and seats?A.Overcharging the system with refrigerantB.Faulty compressor suction valveC.Failure of the high pressure cutoutD.Flash gas formed in the liquid line
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Which of the listed problems could produce a high absolute pressure within a flash type evaporator?A.production of high salinity distillateB.seawater feed temperature below 165℃C.a leak in the first stage demisterD.a cracked distillate pump vent line
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Which tanker discharge pattern would be the safest and most efficient ________．A.Empty the forward tanks and start working aft，emptying each tank in sequenceB.Start discharging with most of the discharge coming from forward，but include some from midships and after tanksC.Start pumping from forward，midships，and aft with the discharge distributed equally among the tanksD.Start pumping from midships and then work forward and aft simultaneously as the midships tank is emptied
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A datacenter manager would like to ensure that all fire suppression in the datacenter is safe for the equipment in the room. Which of the following classifications should be listed on the fire suppression system？（）A、AB、BC、CD、D
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Which of the following items would MOST likely be kept in a documentation file for each server？（）A、 Cost of the equipmentB、 The users home directoriesC、 Server configurationD、 Warranty informationE、 Accessories that came with the system
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A system without a monitor has crashed. The administrator would like to see the console output to determine a possible cause of the crash and ensure that there were no problems on reboot. Which command would be used？（）A、alogB、swconsC、lsconsD、syslog
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单选题Which of the circumstances listed is an exception to the garbage discharge requirements in Annex V to MARPOL 73/78?（）A
The garbage to be discharged will sinkB
Garbage accumulation onboard has exceeded storage spaceC
A person falls overboard, and a plastic ice chest is thrown for flotationD
The destination port or terminal cannot receive garbage
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单选题Which of the listed problems would be indicated by an accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?（）A
Excessive cylinder linerB
water in the fuel systemC
Cracked cylinder linerD
Leaking lube oil cooler
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单选题When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?（）A
cold fuel oilB
low fuel oil pressureC
low atomizing steam pressureD
water in the fuel oil
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单选题Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）A
Improper fuel rack positioningB
Lengthy opening of the exhaust valveC
Excessively early injection timingD
Extended light load operation
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单选题Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）A
clogged air filterB
compression strokeC
burned exhaust valvesD
all of the above
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单选题Which of the equipment listed is most effective in processing bilge slops for overboard discharge?（）A
100PPM oily water separatorB
Assembling the lube oil purifier as a separator and aligning bilge overboardC
A 15PPM oily water separatorD
A magnetic duplex strainer
考题
单选题Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）A
Production of high salinity distillateB
Seawater feed temperature below 165℃C
A leak in the first stage demisterD
A cracked distillate pump vent line
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单选题Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）A
Lube oil passing through the systemB
Moisture or foreign matter collecting at the valve seat and orificeC
Variable spring tension caused by the changing temperatureD
Frost on the liquid line
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单选题For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）A
Chilled water system supply temperatureB
Chilled water system return temperatureC
Compressor discharge temperatureD
Compressor suction pressure
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单选题For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.A
Class A and class BB
Class B and class CC
Class A and class CD
Class C, class D, and class E
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单选题Which of the listed classes of fire would most likely occur in the engine room of a vessel?（）A
Classes A and BB
Classes B and CC
Classes C and DD
Classes A and D
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单选题If a CO2 fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?（）A
Dry chemicalB
HalonC
Low velocity fogD
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单选题Which of the listed materials would be considered as a bunting class "C" fire?（）A
Fuel oilB
WoodC
CelluloidD
Electrical insulation
考题
单选题If ignited, which of the listed materials would be a class "B" fire?（）A
MagnesiumB
PaperC
WoodD
Diesel Oil
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单选题Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）A
Excessive compression in the cylinderB
A broken intake valveC
A dirty inlet filter elementD
An improperly adjusted discharge valve
考题
单选题Which of the listed statements is correct concerning the starting of centrifugal pumps?（）A
They should always be started with the discharge valve closedB
They should always be started with the discharge valve openedC
A priming pump is always required to flood the impeller suctionD
They should always be started with the sealing line valves closed
考题
单选题Which of the following problems will occur if a disk-type centrifugal lube oil purifier is not properly primed prior to admitting oil flow to the bowl?（）A
Contamination of the lube oil by emulsification will resultB
The lube oil will not be subjected to the proper centrifugal forceC
The lube oil will overheat and flashD
Oil will discharge from the heavy phase discharge port and be wasted
考题
单选题When a fuel injection nozzle overheats, which of the problems listed can be expected?（）A
The fuel metering will varyB
The fuel will explodeC
The cylinder head will crackD
The engine will stop
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单选题If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）A
The wearing rings are excessively wornB
The suction strainer is cloggedC
The discharge valve is cloggedD
The shaft is worn
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单选题Which of the listed devices would be installed at a control system air pressure reducing station?（）A
Moisture separatorB
Vacuum breakerC
LubricatorD
Non-return valve
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