TRAVIS CANNING
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power engineering 3b2 Quiz on 4.11 Refrigeration Auxillaries and Operation, created by TRAVIS CANNING on 01/03/2016.

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TRAVIS CANNING
Created by TRAVIS CANNING about 8 years ago
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4.11 Refrigeration Auxillaries and Operation

Question 1 of 10

1

Suction pressure too low might be due to:

Select one of the following:

  • System load too high

  • Not enough condenser cooling water

  • Receiver level too high

  • Receiver level too low

  • Faulty or closed expansion valve

Explanation

Question 2 of 10

1

When changing ammonia systems, frost on the drum bottom indicates:

Select one of the following:

  • Too much refrigerant

  • The ambient temperature is too high

  • Refrigerant drum is empty or very nearly empty

  • Refrigerant drum is still full

  • Pressure is too high

Explanation

Question 3 of 10

1

A low-pressure control in a refrigerating system can be used for:

Select one of the following:

  • Condenser pressure control

  • Starting and stopping the compressor

  • Purging non-condensable gases

  • Keeping the receiver pressure from getting too high

  • Evaporator pressure control

Explanation

Question 4 of 10

1

In an indirect ammonia system using brine and water-cooled condenser, the discharge pressure is controlled by:

Select one of the following:

  • The load on the brine

  • Regulating the expansion valve

  • Regulating the cooling water to the condenser

  • Using a pressure release valve

  • The amount of ammonia refrigerant used

Explanation

Question 5 of 10

1

Where public occupancy is a concern when using Safety Group 2 refrigerants the safest systems are:

Select one of the following:

  • Direct refrigeration

  • Indirect systems

  • Any available system

  • Automatic refrigeration

  • The C/S/A approved refrigeration systems

Explanation

Question 6 of 10

1

The most efficient method of condenser cooling is

Select one of the following:

  • Air cooled

  • Water cooled

  • Latent heat cooled

  • Diffusion cooled

  • Cooled by another refrigeration unit

Explanation

Question 7 of 10

1

Before changing a new refrigeration installation:

Select one of the following:

  • It should be filled with water first

  • The entire refrigerant containing system must be thoroughly tested for performance

  • It should be filled with refrigerant and tested for performance

  • The entire refrigerant containing system must be completely filled with water and hydrostatically tested

  • It should be filled with hydrogen and tested

Explanation

Question 8 of 10

1

In a indirect ammonia vapour compression system using brine, the suction pressure is controlled by:

Select one of the following:

  • The load on the brine

  • The flow of the cooling water to the suction side of the compressor

  • Throttling the metering valve

  • An equalization valve

  • The flow of the condensing water to the condenser

Explanation

Question 9 of 10

1

Refrigeration application uses could include:

Select one of the following:

  • Heating methods in industry

  • Gas distillation process

  • Refrigerant oil purification

  • Air conditioning humidifying

  • Air conditioning or gas dehydration

Explanation

Question 10 of 10

1

The capillary tube has a

Select one of the following:

  • Very small diameter

  • Medium sized diameter

  • Large diameter

  • Convergent-divergent cross-section

  • Concaved cross sectional area

Explanation

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