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单选题
When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.
A
completely filled with saltwater
B
filled with de-scaling compound
C
tightly closed to exclude air
D
vented to the atmosphere
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考题
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考题
单选题A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced（）A
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考题
单选题The heated feed-water entering any flash chamber of a flash-type evaporator will（）A
vaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamberB
vaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamberC
vaporize, with the remaining water a t a temperature greater than it entered the flash chamberD
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考题
单选题When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.A
to decrease scale formationB
for better cooling effectC
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考题
单选题A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.A
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wearing a safety harness secured to the stageC
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单选题When a deck cargo is secured with chain or wire lashings and grab (pear) links，which statement is FALSE?（）A
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考题
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考题
单选题Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator, are removed by the （）A
spray pipesB
demistersC
condensersD
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考题
单选题The demisters installed in a flash-type evaporator serve to （）A
deaerate the first effect distillateB
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考题
单选题When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.A
always be wide open when the compressor restartsB
continue to operate as if the system were in operationC
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考题
单选题The bulb for the thermal expansion valve is located（）A
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near the evaporator coil outletC
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考题
单选题When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.A
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None of the above is tree
考题
单选题Anchors are prevent from running out when secured by the（）.A
brakeB
devil's clawC
pawlsD
All of the above
考题
单选题The heated feedwater entering any flash chamber of a flash-type evaporator will（）A
vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamberB
vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamberC
vaporize, with the remaining water at the temperature greater than it entered the flash chamberD
boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
考题
单选题On a multistage flash-type evaporator, the flash chamber is （）A
combined as part of the salt water feed heaterB
the open area above the brine levels in the first and second stagesC
combined as part of the distillate coolerD
another term used to describe the vapor feed heater
考题
单选题Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）A
Sea water is heated to boiling temperature while under a vacuumB
Sea water is passed over heated plates in a thin filmC
Heated sea water is injected into a vacuum chamberD
Sea water is forced through a heated eductor
考题
单选题Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.A
first stageB
second stageC
distillate coolerD
salt water feed heater
考题
单选题When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and （） the sea water passing through the tubes.A
disposeB
dissolveC
heatD
dissipates
考题
单选题When securing a flash-type evaporator for an extended period of time, you should （）.A
fill the unit with saltwaterB
fill the unit with de-scaling compoundC
completely drain the unitD
tightly seal the unit to exclude air
考题
单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveC
The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveD
The heating steam must be secured before the diesel oil passes through the three-way valve
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