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单选题
The temperature at which water vapor in the atmosphere begins to condense is called the （）.
A
dew point temperature
B
condensation temperature
C
psychometric temperature
D
absolute humidity temperature
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While working in the server room a technician notices that water is forming on the walls of the serverroom. Which of the following is the BEST course of action to correct the problem？（）A、 Contact facilities staff to adjust the humidity levels.B、 Leave the temperature the same， after time it will evaporate on its own.C、 Lower the temperature， the cold air will help the water evaporate.D、 Contact facilities staff to raise the temperature of the room.
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单选题（） is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.A
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单选题The vapor pressure of a substance（）.A
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单选题Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.A
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the higherC
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考题
单选题The dew point temperature is（）.A
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the temperature at which the air is saturated with water vapor
考题
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Contact facilities staff to adjust the humidity levels.B
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考题
单选题The dew point is reached when the（）.A
temperature of the air equals the temperature of the seawaterB
atmospheric pressure is 14.7 lbs. per square inchC
relative humidity reaches 50%D
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单选题The temperature at which the air is saturated with water vapor and below which condensation of water vapor will occur is referred to as the（）.A
precipitation pointB
vapor pointC
dew pointD
absolute humidity
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单选题Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level.A
a level controllerB
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单选题The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the （）A
flash pointB
fire pointC
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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
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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
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单选题In the two stage flash distilling plant, which of the pumps listed is vented to the shell of the second stage in order to remove vapor from the pump suction?（）A
Condenser circulating water pumpB
Feed-water heater drain pumpC
Distillate pumpD
Air ejector condenser drain pump
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单选题The second stage feed-water temperature and shell absolute pressure in a multistage, flash type, distilling plant is （）A
higher than the first stage feed-water temperature and absolute shell pressureB
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the same as the first stage feed-water temperature and absolute shell pressureD
not related to the feed-water temperature and absolute shell pressure
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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
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单选题Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）A
A room thermostat activates an electric heater at each individual chilled air outlet when necessaryB
Varying the number of passes the air makes across the coilsC
Varying the temperature of the water through the coilsD
Varying the quantity of water flowing through the coils
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单选题Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）A
Ball floatB
ThermostaticC
BimetallicD
Impulse
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单选题Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）A
Air will enter the cooling systemB
Carbon will plug the water cooled exhaust manifoldsC
The jacket water temperature will riseD
The lube oil viscosity will increase
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单选题Which of the following statements is correct relative to distillation plant operation?（）A
Distillation is the process of boiling seawater to produce vapor which is condensed into fresh waterB
Evaporation is the second part of the distillation process where brine is removedC
Brine is the result of condensed sea water vaporD
Distillate is the product resulting from the evaporation of fresh water vapor
考题
单选题The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.A
boiling pointB
flash pointC
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