Refrigerant enters the condenser as a （）.

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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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• A vessel is entering port A for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do（）.

  A . Nothing; The Pilot is required by law and is solely responsible for the safety of the vessel B . State his concerns to the Pilot but do not interfere with the handling of the vessel C . Direct the Pilot to stop the vessel and anchor if necessary until the situation clears D . Recommend an alternative action and if not followed relieve the Pilot

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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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• 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

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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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• 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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• _ the pros snd cons before making a final decision.

  A、Balanced B、Balance C、Balancing D、Balanction

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