4699066
Descripción
Test por TRAVIS CANNING, actualizado hace más de 1 año
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Creado por TRAVIS CANNING
hace más de 10 años
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Pregunta 1
Pregunta
Suction pressure too low might be due to:
Respuesta
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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
Pregunta 2
Pregunta
When changing ammonia systems, frost on the drum bottom indicates:
Respuesta
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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
Pregunta 3
Pregunta
A low-pressure control in a refrigerating system can be used for:
Respuesta
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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
Pregunta 4
Pregunta
In an indirect ammonia system using brine and water-cooled condenser, the discharge pressure is controlled by:
Respuesta
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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
Pregunta 5
Pregunta
Where public occupancy is a concern when using Safety Group 2 refrigerants the safest systems are:
Respuesta
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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
Pregunta 6
Pregunta
The most efficient method of condenser cooling is
Respuesta
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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
Pregunta 7
Pregunta
Before changing a new refrigeration installation:
Respuesta
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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
Pregunta 8
Pregunta
In a indirect ammonia vapour compression system using brine, the suction pressure is controlled by:
Respuesta
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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
Pregunta 9
Pregunta
Refrigeration application uses could include:
Respuesta
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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
Pregunta 10
Pregunta
The capillary tube has a
Respuesta
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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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