4699066
Descrição
Quiz por TRAVIS CANNING, atualizado more than 1 year ago
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Criado por TRAVIS CANNING
aproximadamente 8 anos atrás
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Questão 1
Questão
Suction pressure too low might be due to:
Responda
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System load too high
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Not enough condenser cooling water
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Receiver level too high
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Receiver level too low
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Faulty or closed expansion valve
Questão 2
Questão
When changing ammonia systems, frost on the drum bottom indicates:
Responda
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Too much refrigerant
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The ambient temperature is too high
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Refrigerant drum is empty or very nearly empty
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Refrigerant drum is still full
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Pressure is too high
Questão 3
Questão
A low-pressure control in a refrigerating system can be used for:
Responda
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Condenser pressure control
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Starting and stopping the compressor
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Purging non-condensable gases
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Keeping the receiver pressure from getting too high
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Evaporator pressure control
Questão 4
Questão
In an indirect ammonia system using brine and water-cooled condenser, the discharge pressure is controlled by:
Responda
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The load on the brine
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Regulating the expansion valve
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Regulating the cooling water to the condenser
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Using a pressure release valve
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The amount of ammonia refrigerant used
Questão 5
Questão
Where public occupancy is a concern when using Safety Group 2 refrigerants the safest systems are:
Responda
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Direct refrigeration
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Indirect systems
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Any available system
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Automatic refrigeration
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The C/S/A approved refrigeration systems
Questão 6
Questão
The most efficient method of condenser cooling is
Responda
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Air cooled
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Water cooled
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Latent heat cooled
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Diffusion cooled
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Cooled by another refrigeration unit
Questão 7
Questão
Before changing a new refrigeration installation:
Responda
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It should be filled with water first
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The entire refrigerant containing system must be thoroughly tested for performance
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It should be filled with refrigerant and tested for performance
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The entire refrigerant containing system must be completely filled with water and hydrostatically tested
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It should be filled with hydrogen and tested
Questão 8
Questão
In a indirect ammonia vapour compression system using brine, the suction pressure is controlled by:
Responda
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The load on the brine
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The flow of the cooling water to the suction side of the compressor
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Throttling the metering valve
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An equalization valve
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The flow of the condensing water to the condenser
Questão 9
Questão
Refrigeration application uses could include:
Responda
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Heating methods in industry
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Gas distillation process
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Refrigerant oil purification
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Air conditioning humidifying
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Air conditioning or gas dehydration
Questão 10
Questão
The capillary tube has a
Responda
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Very small diameter
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Medium sized diameter
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Large diameter
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Convergent-divergent cross-section
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Concaved cross sectional area
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