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10 Cards in this Set
- Front
- Back
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The standard refrigeration cycle is used to compare refrigerants and machines operating under comparable conditions. These standard conditions are: 1) 1 030 kPa and atmospheric pressure 2) 30 kPa and atmospheric pressure 3) 30 kPa and atmospheric temperature 4) -30ºC condensing and 15ºC evaporating 5) 30ºC condensing and -15ºC evaporating |
30ºC condensing and -15ºC evaporating |
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Which of the following is not a physical property of a refrigerant? 1) Entropy 2) Toxicity 3) Miscibility 4) Flammability 5) Leakage tendency |
Entropy |
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Which of the following is not a physical property of refrigerants? 1) Leakage tendency 2) Odour 3) Oxidization 4) Explosiveness 5) Toxicity |
Oxidization |
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A refrigerant in the "B" Group that is used more than others in its group in refrigeration systems is: 1) Freon 12 2) Freon 22 3) Methane 4) Ammonia 5) Propane |
Ammonia |
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The refrigerant R-11 belongs to the following group: 1) "A3" 2) "A1" 3) "2B" 4) "B1" 5) "A2" |
"A1" |
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R-290 refrigerant belongs to the following group of refrigerants: 1) Group B2 2) Group B1 3) Group A1 4) Group A2 5) Group A3 |
Group A3 |
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R-22 (Freon-22) is non-toxic and non-flammable. Which of the following groups does it belong to? 1) Group A3 2) Group A1 3) Group B4 4) Group A2 5) Group B2 |
Group A1 |
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What is the name of the refrigerant that has the following characteristics? It is non-flammable, odourless, non-toxic, it does not have a corrosive effect on metal if water is present and at atmospheric pressure it has a boiling point of approximately -40.6°C: 1) Freon-22 2) Sulphur Dioxide 3) Butane 4) Ammonia 5) Propane |
Freon-22 |
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Which of the following characteristics is common in all of the Group B refrigerants? 1) Low flammability 2) Low toxicity 3) High toxicity 4) Average flammability 5) High flammability |
High toxicity |
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Group "A2" refrigerants as found in the current code are: 1) High-toxic and flammable 2) Low-toxic and flammable 3) Non-flammable 4) Low-flammable 5) Low-toxic |
Low-toxic |
