Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.

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• 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 chamber B . vaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamber C . vaporize, with the remaining water a t a temperature greater than it entered the flash chamber D . boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber

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• When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.

  A . to decrease scale formation B . for better cooling effect C . for more economical purpose D . to raise vacuum

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• 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 . dispose B . dissolve C . heat D . dissipate

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• Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.

  A . fire-tubes B . furnaces C . down-comers D . soot-blower

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• The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by （）.

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• The water level in a steaming auxiliary boiler will always （）

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• What is NOT a function of the steam drum of a marine water-tube boiler（）.

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• In an auxiliary boiler steam and water system, the highest pressure will be in the （）.

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• Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator, are removed by the （）

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• ______ the heat to a simmer and continue to cook for another 8—10 minutes or until most of the water has evaporated.

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