更多"The heat removed from the refrigera"的相关试题:
[单项选择]A refrigerant gives up heat when it goes through （）.
A. condenser
B. regurgitate
C. evaporator
D. boil coil
[单项选择]When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）
A. CO2
B. Methyl chloride
C. R-22
D. Sulphur dioxide
[单项选择]The heat gained per pound of refrigerant in the evaporator is known as the（）.
A. latent heat of vaporization
B. sensible heat
C. refrigerating effect
D. specific heat of vaporization
[单项选择]Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.
A. air cooler
B. economizer
C. injector
D. air blower
[单项选择]Moisture is removed from a refrigeration system by（）.
A. bleeding refrigerant from the condenser
B. opening a drain petcock on the oil separator
C. condensing the water in the heat exchanger
D. using a dehydrator cartridge
[单项选择]The rate of heat transfer from a hot region to a cold region is affected most by the （）.
A. size of the heat sink
B. temperature difference between the regions
C. size of the heat source
D. total heat of the system
[单项选择]Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）
A. natural aspiration
B. masked intake valves
C. air cells
D. scavenging air
[单项选择]Air or noncondensable gas is removed from a refrigeration system by a （）
A. separating chamber
B. system of baffles
C. purge valve
D. vacuum reducing valve
[单项选择]A patient suffering from heat exhaustion should be（）.
A. moved to a cool room and told to lie down
B. kept standing and encouraged to walk slowly and continuously
C. given a glass of water and told to return to work after 15 minutes of rest
D. None of the above are correct
[单项选择]The （） can tell us how much heat we can get from the burning of an oil.
A. viscosity
B. flash point
C. cetane number
D. calorific value
[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]Refrigerant is circulated through a refrigeration system by the （）.
A. compressor
B. condenser
C. expansion valve
D. evaporator
[单项选择]The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.
A. fusion
B. vaporization
C. sublimation
D. condensation
[单项选择]The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of （）.
A. fusion
B. vaporization
C. condensation
D. sublimation
[单项选择]Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
A. Sub-cooled liquid
B. Sub-cooled vapor
C. Superheated vapor
D. Liquid
[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]Since heat will not flow freely from a body at a （） temperature to another at a （） temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.
A. lower；higher
B. shallower；deeper
C. larger；smaller
D. higher；lower
[单项选择]As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into （）.
A. liquid
B. oily mixture
C. emulsion
D. vapor
[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
