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单选题
Which operation may cause the pressure in an inert tank to fall below the prescribed limits().
A
Loading
B
Discharging
C
Crude oil washing
D
Steaming tanks
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In the following statements about the principle of the low level controlling, which is WRONG? 0
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Which of the following actions may cause a trigger to be fired?()
A.DROPB.ALTERC.DELETED.ROLLBACK
考题
How does an inert gas system on a tanker function to prevent explosions in cargo tanks?A.De-energizes the "charged mist" effectB.Maintains a positive pressure on the vent header to cool the flammable vaporsC.Inert gas filters out the flammable vapors from the cargo tank spacesD.Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
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Which method is used to supply inert gas from a flue gas system to the cargo tanks?A.Exhaust gas pressure from the stackB.High capacity fanC.Inert gas compressorD.Natural aspiration
考题
You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take?A.Cut in another IG fan to increase gas flowB.Open the pressure control valve until the pressure increasesC.Open the tank isolation valve to the fully open positionD.Reduce the pumping rate
考题
By regulation,cargo tank atmosphere must be inert before and during which operation ________.A.StrippingB.LoadingC.CleaningD.All of the above
考题
Which operation may cause the pressure in an inert tank to fall below the prescribed limits ________.A.LoadingB.DischargingC.Crude oil washingD.Steaming tanks
考题
Inerting means ______.A.The introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volumeB.The introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volumeC.The introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargoD.All of the above
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The use of portable electrical equipment in the pumproom on tank barges is prohibited unless ______.A.The pumproom is gas-freeB.Spaces with bulkheads common to the pumproom are either gas-free,inert,filled with water,or contain grade E liquidC.All other compartments in which flammable vapors and gases may exist are closed and securedD.All of the above
考题
When a non-volatile cargo is carried in a tank that has not been previously gas freed,then that tank shall ______.A.be purged with hydrocarbon gas prior to loadingB.be gas-freed after loading operationsC.not be maintained in an inert conditionD.be maintained in an inert condition
考题
Which statement about inert gas pressures in a cargo tank is TRUE ________.A.The pressures of the inert gas in the tank may create excessive pressure at the pump while dischargingB.Gas pressures should be maintained at the highest permissible level throughout the discharging processC.High gas pressures may cause pyrophoric oxidation in the tankD.High gas pressures may cause loss of suction when stripping
考题
Which of the following actions may cause a trigger to be fired?()A、DROPB、ALTERC、DELETED、ROLLBACK
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单选题Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because().A
a subsequent temperature rise will cause the cargo to overflowB
air pockets may cause the cargo to bubble out of the ullage holeC
the increased viscosity of the product requires higher loading pressure which increases the chances of a spillD
the tank valve may be stiff and a spill will occur before the valve can be closed
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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The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means ().A
startersB
pressure switchesC
pressureD
water
考题
单选题A pressure drop through the refrigerant liquid line may cause ().A
solenoid valve to seizeB
compressor to huntC
formation of flash gas in the liquid lineD
expansion valve to freeze open
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单选题Defense plans may cause the operation of electronic aids to navigation to be suspended with ().A
no noticeB
one day's noticeC
a week's noticeD
thirty (30) days notice
考题
单选题By regulation,cargo tank atmosphere must be inert before and during which operation?()A
StrippingB
LoadingC
CleaningD
All of the above
考题
单选题What action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?()A
The tank must be gas freedB
The tank must be ballastedC
The tank must be vented to the atmosphereD
The bypass valve must also be closed
考题
单选题Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?()A
The tank must be gas freedB
The tank must be ballastedC
The tank must be vented to the atmosphereD
The bypass valve must also be closed
考题
单选题Why is it important for fuel oil tanks not to be topped off at the inner bottom level when loading on a cold day?()A
Increased viscosity of the product needs higher loading pressure, which increases the chances of a spillB
Air pockets may cause the fuel to bubble out of the ullage holeC
The temperature rise of the fuel will cause an overflowD
Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened
考题
单选题Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? () (1) faulty condensing (2) too few refrigerant (3) high discharge pressureA
any of (1) and (3)B
any of (1) and (2)C
any of (2) and (3)D
any of (1), (2) and (3)
考题
单选题You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take? ()A
Cut in another IG fan to increase gas flowB
Open the pressure control valve until the pressure increasesC
Open the tank isolation valve to the fully open positionD
Reduce the pumping rate
考题
单选题Inerting means().A
the introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volumeB
the introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volumeC
the introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargoD
All of the above
考题
单选题Which method is used to supply inert gas from a flue gas system to the cargo tanks?()A
Exhaust gas pressure from the stackB
High capacity fanC
Inert gas compressorD
Natural aspiration
考题
单选题A crew member reports that the high-pressure alarm light of a low-pressure CO2 fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that().A
an air leak has developed in the tankB
the tank cooling system has malfunctionedC
the pilot cylinder discharge valve is leakingD
an excessive amount of insulation has been installed on the tank and piping
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