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The temperature of the refrigerant in the evaporator coil depends mostly upon the （）.
A . refrigerant pressure in the evaporator
B . cooling water temperature to the condenser
C . heat load in the refrigerator compartment
D . solenoid valve in the liquid line
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The boiling and condensation points of refrigerant mainly depend on the （） exerted upon it.
A . temperature
B . density
C . volume
D . pressure
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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
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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 gla
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The color of the flame on a halide torch without any refrigerant present is （）.
A . blue
B . green
C . orange
D . purple
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To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）
A . suction service valve as a vapor
B . suction service valve as a liquid
C . discharge service valve as a vapor
D . charging valve as a liquid
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Before charging a refrigeration unit, the refrigerant charging lines should be（）
A . flushed with clean refrigerant oil
B . purged with the refrigerant
C . washed with an ammonia and alcohol solution
D . grounded to compressor
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In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.
A . compressor
B . condenser
C . receiver
D . evaporator
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The refrigerant flows through the evaporator, where it （） heat from the refrigerated space.
A . extracts
B . releases
C . gives no
D . absorbs no
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The compressor suction line conveys the refrigerant vapor from （） to （）.
A . condenser；evaporator
B . evaporator；compressor
C . compressor；condenser
D . None of the above
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In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）
A . its pressure and temperature are both lowered
B . its pressure and temperature are both raised
C . its pressure is lowered and its temperature is raised
D . its pressure is raised and its temperature is lowered
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Moisture in the refrigerant may （）.
A . freeze on the expansion valve seat and reduce the flow of liquid refrigerant
B . emulsify the oil in the condenser
C . freeze in the king valve
D . clog the oil tra
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The temperature of a refrigerant gas is the highest （）.
A . at the compressor discharge
B . at the compressor suction
C . in the expansion valve
D . in the receiver
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Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）
A . Expansion valve
B . Condenser
C . Evaporator
D . Compressor
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The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the （）.
A . condenser
B . vapor generator
C . accumulator
D . evaporator
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“Flooding back” is a condition where the liquid refrigerant （）.
A . vaporizes in the condenser
B . reaches the compressor through the suction line
C . flashes in the liquid line
D . condenses in the receiver
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In which of the listed refrigeration system components does superheating of the refrigerant take place?（）
A . Expansion valve
B . Evaporator
C . Drier
D . Receiver
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In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the（）.
A . evaporator
B . compressor
C . expansion valve
D . condenser
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To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.
A . discharge service valve as a vapor
B . suction service valve as a liquid
C . charging valve as a liquid
D . condenser purge valve as a vapor
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When the relief valve opens it discharges high pressure refrigerant vapor to the （）.
A . liquid strainer
B . refrigerant inlet of the condenser
C . inlet side of the evaporator
D . suction side of the compressor
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Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its （）.
A . freezing point
B . floc point
C . condensing temperature
D . compression temperature
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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 hel
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Refrigerant enters the condenser as a （）.
A . high pressure liquid
B . low pressure vapor
C . high pressure vapor
D . low pressure liquid
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When he entered college, he begn to lern _____ lnguge. thirdB．the third C． threeD．the three
When he entered college, he begn to lern _____ lnguge. third B．the third C． three D．the three
A．a third
B．the third
C．a three
D．the three
