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Refrigerants Basic Quiz Test 4
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Question 1 of 15
1. Question
1 pointsWhich of the following type of refrigerant cool substances by absorbing their sensible heats:
Correct
Class 2 refrigerants are non-flammable and non-toxic, and they have a high latent heat of vaporization. Ex: Air, Calcium chloride brine, Sodium chloride brine
Incorrect
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Question 2 of 15
2. Question
1 pointsWhich of the following property is desirable for a refrigerant:
Correct
Refrigerants that operate on positive pressure offer a number of advantages, including less likelihood of leaks, greater reliability, and increased safety.
Incorrect
Refrigerants that operate on positive pressure offer a number of advantages, including less likelihood of leaks, greater reliability, and increased safety.
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Question 3 of 15
3. Question
1 pointsWhen Carbon dioxide is used as refrigerant, the size of the compressor will be:
Correct
This is because CO2 has a higher volumetric efficiency than other refrigerants, meaning that it can absorb more heat per unit volume.
Incorrect
This is because CO2 has a higher volumetric efficiency than other refrigerants, meaning that it can absorb more heat per unit volume.
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Question 4 of 15
4. Question
1 pointsFreon compounds are good conductors of electricity:
Correct
Freon compounds are non-polar molecules, which means that they do not have a net electrical charge. As a result, they do not readily conduct electricity.
Incorrect
Freon compounds are non-polar molecules, which means that they do not have a net electrical charge. As a result, they do not readily conduct electricity.
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Question 5 of 15
5. Question
1 pointsHigh molecular weight of the Freon compound attributed to which of the following:
Correct
High molecular weight means that the molecules are more tightly bound together, which requires more energy to break those bonds and vaporize the substance.
Incorrect
High molecular weight means that the molecules are more tightly bound together, which requires more energy to break those bonds and vaporize the substance.
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Question 6 of 15
6. Question
1 pointsWhich of the following Freon Refrigerant has highest density:
Correct
The high density of R-11 is due to its molecular weight. The higher the molecular weight, the more mass is contained in a given volume, and therefore the higher the density.
Incorrect
The high density of R-11 is due to its molecular weight. The higher the molecular weight, the more mass is contained in a given volume, and therefore the higher the density.
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Question 7 of 15
7. Question
1 pointsWhich of the following refrigerant has the lowest specific volumes as vapor:
Correct
The low specific volume of R-11 is due to its high molecular weight. The higher the molecular weight, the less space is occupied by a given mass, and therefore the lower the specific volume.
Incorrect
The low specific volume of R-11 is due to its high molecular weight. The higher the molecular weight, the less space is occupied by a given mass, and therefore the lower the specific volume.
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Question 8 of 15
8. Question
1 pointsWhen Carbon dioxide is present in the condenser water, the water will turn ______with addition of bromothymol blue:
Correct
Bromothymol blue is an indicator that changes color depending on the pH of the solution. In a neutral or basic solution, bromothymol blue is blue. In an acidic solution, bromothymol blue is yellow. Carbon dioxide is acidic, so when it is dissolved in water, it will make the water acidic.
Incorrect
Bromothymol blue is an indicator that changes color depending on the pH of the solution. In a neutral or basic solution, bromothymol blue is blue. In an acidic solution, bromothymol blue is yellow. Carbon dioxide is acidic, so when it is dissolved in water, it will make the water acidic.
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Question 9 of 15
9. Question
1 pointsWhen a large concentration of methyl chloride leak is detected using halide torch, a brilliant ______ flame is produced:
Correct
A halide torch is a tool used to detect and quantify the presence of halogenated compounds. The blue flame produced by a halide torch, when it comes into contact with methyl chloride it ionizes the compound. When the methyl chloride is ionized, it emits a blue light.
Incorrect
A halide torch is a tool used to detect and quantify the presence of halogenated compounds. The blue flame produced by a halide torch, when it comes into contact with methyl chloride it ionizes the compound. When the methyl chloride is ionized, it emits a blue light.
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Question 10 of 15
10. Question
1 pointsFor detecting the sulfur dioxide leak, which of the following is not used:
Correct
A halide torch is a tool used to detect and quantify the presence of halogenated compounds, such as refrigerants, solvents, and propellants.
Incorrect
A halide torch is a tool used to detect and quantify the presence of halogenated compounds, such as refrigerants, solvents, and propellants.
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Question 11 of 15
11. Question
1 pointsThe lower the molecular weight of the refrigerant, the ______ the hole must be required for the refrigerant to escape:
Correct
The lower the molecular weight, the smaller the size of the molecules. Smaller molecules can more easily pass through small holes
Incorrect
The lower the molecular weight, the smaller the size of the molecules. Smaller molecules can more easily pass through small holes
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Question 12 of 15
12. Question
1 points_____ pressure & ______ temperature refrigerant tend to leak and escape easily from the refrigeration system
Correct
The higher the pressure, the more force the refrigerant molecules have, and the warmer the refrigerant, the faster the molecules move.
Incorrect
The higher the pressure, the more force the refrigerant molecules have, and the warmer the refrigerant, the faster the molecules move.
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Question 13 of 15
13. Question
1 pointsCO2 operates at a much higher pressure than traditional refrigerants
Correct
Higher operating pressure results in a system difficult to design and manufacture that use it
Incorrect
Higher operating pressure results in a system difficult to design and manufacture that use it
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Question 14 of 15
14. Question
1 pointsA worker adversely affected by fluorocarbon vapors should be treated with adrenaline (epinephrine):
Correct
If a worker is exposed to high levels of fluorocarbon vapors, Oxygen is given to help the worker breathe. Steroids are given to help reduce inflammation in the lungs and Anticonvulsants are given to help prevent seizures
Incorrect
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Question 15 of 15
15. Question
1 pointsMagnesium alloys and Aluminum containing more than ______ of magnesium is not recommended for use in system containing Freon compounds in presence of water:
Correct
This is because magnesium can react with Freon compounds to form magnesium hydroxide, which is a white, powdery substance that can clog pipes and valves. Magnesium hydroxide can also react with water to form hydrogen gas, which can be flammable.
Incorrect
This is because magnesium can react with Freon compounds to form magnesium hydroxide, which is a white, powdery substance that can clog pipes and valves. Magnesium hydroxide can also react with water to form hydrogen gas, which can be flammable.