更多"The refrigerant leaves the evaporat"的相关试题:
[单项选择]The refrigerant flows through the evaporator, where it （） heat from the refrigerated space.
A. extracts
B. releases
C. gives no
D. absorbs no
[单项选择]When refrigerant leaves the receiver, it flows next on to the （）.
A. evaporator coils
B. liquid strainer
C. compressor
D. condenser
[单项选择]The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）
A. system is overcharged with refrigerant
B. system is low on refrigerant
C. discharge valves are leaking excessively
D. discharge valves are leaking slightly
[单项选择]In the refrigeration system, a shortage of refrigerant is indicated by （）.
A. the compressor short cycling on high pressure cut out switch
B. high suction pressure
C. high head pressure
D. bubbles in the sight glass
[单项选择]Scale accumulation on evaporator heat exchange surfaces （）.
A. increases brine density
B. increases distillate salinity
C. reduces metal corrosion
D. reduces heat transfer
[单项选择]Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）
A. solenoid valve
B. low pressure cutout switch
C. king valve
D. thermal expansion valve
[单项选择]Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.
A. the distillate produced has greater purity
B. no boiling occurs on heat transfer surfaces
C. evaporation occurs at a higher rate
D. the incoming feed is at a higher temperature
[单项选择]Distilled water from an evaporator may be discharged into a potable water tank （）.
A. through a detachable hose connection
B. after passing through an activated charcoal filter
C. after chemical analysis shows it is fit for consumption
D. through a solenoid operated three-way valve
[单项选择]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. lower condensing
B. higher cooling
C. lower cooling
D. higher condensing
[单项选择]Insufficient refrigerant in a refrigeration plant may result in （）.
A. high discharge pressure
B. frosting of the crankcase
C. high temperature of the overboard water
D. low suction pressure of compressor
[单项选择]The flash-evaporator is different with the submerged-tube evaporator in that for the former（）
A. Water is heated into vapor on heating surfaces
B. Water is vaporized by pressure difference
C. There are no heating-transfer surfaces
D. There are more heating-transfer surfaces
[单项选择]The saturation temperature of the refrigerant must be （） that required in the evaporator refrigerated space.
A. above
B. below
C. equal to
D. None of the above
[单项选择]If liquid refrigerant accidentally comes in contact with the eyes, （） immediately.
A. rub the eyes
B. irritate the eyes
C. wash the eyes with a heavy boric acid solution
D. obtain medical help
[单项选择]The boiling and condensation points of refrigerant mainly depend on the （） exerted upon it.
A. temperature
B. density
C. volume
D. pressure
[单项选择]In a flash type evaporator, the brine overboard pump is vented directly to the（）
A. saltwater heater shell
B. the condensation of the saltwater feed
C. air ejectors, eductors, or a separate vacuum pump
D. condensation of the distillate
[单项选择]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. dissipates
[单项选择]Refrigerant is circulated through a refrigeration system by the （）.
A. compressor
B. condenser
C. expansion valve
D. evaporator
[单项选择]The shutter of the evaporator was blocked with （）, it means there was too much evaporation.
A. ice
B. wooden board
C. iron plate
D. cotton waste
[单项选择]On a multistage flash-type evaporator, the flash chamber is （）
A. combined as part of the salt water feed heater
B. the open area above the brine levels in the first and second stages
C. combined as part of the distillate cooler
D. another term used to describe the vapor feed heater
