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单选题
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A
double bottom fuel oil tank temperature
B
heater supply steam flow
C
pressure of the fuel supplied to the burners
D
attemperator steam flow in the heater discharge circuit
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Valves on steam-smothering lines to cargo tanks shall be set with ______．A.The master control valve shut and valves to individual cargo tanks shutB.The master control valve open and valves to individual cargo tanks shutC.The master control valve shut and valves to individual cargo tanks openD.All valves open
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单选题Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）A
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单选题On a ship，a fire pump may be used for other purposes if（）.A
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单选题The purpose of the safety relief valves installed on an auxiliary boiler is to （）.A
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Increasing the starting air pressure usedC
Opening the stating air valve quicklyD
Reducing the starting air valve size
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单选题Which method should be used to warm up the pump turbines prior to discharge（）.A
Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB
Run the pump at high speed with the discharge valves closedC
Run the turbine at slow speed with the pump disconnectedD
Shut the discharge valve and run the pump at slow speed
考题
单选题In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.A
open and individual tank valves openB
open and the individual tank valves closedC
closed and the individual tank valves closedD
closed and the individual tank valves open
考题
单选题A fire pump may be used for other purposes if（）.A
the other services are run off a reducing station with a pressure gageB
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单选题Which one is not the normal operation for boiler shutdown?（）A
Carry out soot blowing if permissibleB
Change fuel supply to diesel oilC
Close steam stop valves on boiler when pressure is reducedD
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考题
单选题Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）A
double bottom fuel oil tank temperatureB
heater supply steam flowC
pressure of the fuel supplied to the burnersD
attemperator steam flow in the heater discharge circuit
考题
单选题Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）A
Both seamless mild steel and copper may be used for middle pressure steamB
hpair means high pressure airC
The feed piping of the boilers can be made of seamless mild steelD
All oil pipings are made of mild steel
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单选题Differential needle valves used in fuel injectors are directly closed by（）A
cam actionB
spring forceC
fuel oil pressureD
firing pressure
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ensure feed water flow into the boilerB
keep the steam drum pressure highC
prevent water hammer in the feed lineD
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单选题The water level in a steaming auxiliary boiler will always （）A
rise when the steam pressure is increasedB
remain constant as long as the feed pump operatesC
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单选题Compensated flow control or constant flow valves are used in hydraulic systems to（）A
compensate for major leaks in the systemB
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allow for changes in pressure and temperature within the systemD
assure constant fluid temperature
考题
单选题The thermostatic valve has a throttling action, that is to say the valve can（）A
stop the refrigerant from flowingB
force the refrigerant to flowC
cause the refrigerant pressure to riseD
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考题
单选题The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.A
fuel valves of main engineB
injector pump of main engineC
safety valves of marine boilerD
safety valves of a reciprocating pump
考题
单选题Thermostatic expansion valves can be adjusted for （）.A
suction pressure onlyB
head pressure onlyC
superheat onlyD
suction pressure and box temperature
考题
单选题In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?（）A
The solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloadedB
The solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be openedC
When the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unloadD
The solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder
考题
单选题Soot blowers should be used in proper sequence so that（）A
excess stresses will not be set up in the boilerB
the decks will not be covered with sootC
the soot will be swept toward the uptakesD
there will not be a loss of steam pressure
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单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）A
The coolant temperature must be maintained at 180℃B
The thermostatic bypass valves must be manually opened before the engine is startedC
The pressure cap must be removed while the engine is securedD
Electrical power to the heater must be secured before the cooling system is drained
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单选题The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with （）.A
a needle gunB
soap and waterC
a wire brushD
a chipping hammer
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单选题Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.A
leaky discharge valves on the LP cylinderB
leaky discharge valves on the HP cylinderC
insufficient intercooler coolingD
low ambient air pressure
考题
单选题In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.A
open and individual tank valves openB
open and the individual tank valves closedC
closed and the individual tank valves closedD
closed and the individual tank valves open
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