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Question 1 of 15
1. Question
1 points
The high dielectric strength of refrigerant is indicative of the presence of moisture and contaminants in the refrigerant
Correct
Dielectric strength is a measure of the electrical insulation capability of a substance. When a refrigerant becomes contaminated with moisture or other impurities, it can lower its dielectric strength.
Incorrect
Dielectric strength is a measure of the electrical insulation capability of a substance. When a refrigerant becomes contaminated with moisture or other impurities, it can lower its dielectric strength.
Question 2 of 15
2. Question
1 points
Refrigerants with ______ specific volume at a given suction pressure and temperature will require higher compressor displacement
Correct
The specific volume of a refrigerant refers to the volume occupied by a unit mass of the refrigerant. It is inversely proportional to the density of the refrigerant.
The higher the specific volume of the refrigerant lower will be the density of the refrigerant and takes up more space. In order to move a larger volume of refrigerant per unit of time, the compressor needs to have a higher compressor displacement (volume swept by the compressor piston or rotating components per unit of time).
Incorrect
The specific volume of a refrigerant refers to the volume occupied by a unit mass of the refrigerant. It is inversely proportional to the density of the refrigerant.
The higher the specific volume of the refrigerant lower will be the density of the refrigerant and takes up more space. In order to move a larger volume of refrigerant per unit of time, the compressor needs to have a higher compressor displacement (volume swept by the compressor piston or rotating components per unit of time).
Question 3 of 15
3. Question
1 points
The solubility of the water in commonly used refrigerants is low:
Correct
Yes, most refrigerants used in refrigeration systems are typically hydrophobic (low affinity for water). They are designed to have low water solubility to prevent the absorption of moisture from the environment or the formation of water-based solutions within the refrigeration system. The presence of moisture in refrigerant may lead to reduced efficiency, the formation of acids resulting in corrosion, degradation of lubricants, ice formation and damage of compressor and other components
Incorrect
Yes, most refrigerants used in refrigeration systems are typically hydrophobic (low affinity for water). They are designed to have low water solubility to prevent the absorption of moisture from the environment or the formation of water-based solutions within the refrigeration system. The presence of moisture in refrigerant may lead to reduced efficiency, the formation of acids resulting in corrosion, degradation of lubricants, ice formation and damage of compressor and other components
Question 4 of 15
4. Question
1 points
_____ a is combination of 50% of R-32 and 50% of R-125
Correct
R-410A is an HFC refrigerant and is zeotropic refrigerant blend composed of approximately equal parts R-32 (difluoromethane) and R-125 (pentafluoroethane)
Incorrect
R-410A is an HFC refrigerant and is zeotropic refrigerant blend composed of approximately equal parts R-32 (difluoromethane) and R-125 (pentafluoroethane)
Question 5 of 15
5. Question
1 points
Which of the following refrigerant recovery method is used in large refrigeration systems
Correct
In push-pull recovery, a recovery unit is used to create a vacuum in the refrigeration system. This vacuum pulls the refrigerant out of the system and into the recovery cylinder.
Incorrect
In push-pull recovery, a recovery unit is used to create a vacuum in the refrigeration system. This vacuum pulls the refrigerant out of the system and into the recovery cylinder.
Question 6 of 15
6. Question
1 points
Presence of the water in refrigerant results in which of the following:
Correct
Result in acid formation which can cause corrosion
Incorrect
Result in acid formation which can cause corrosion
Question 7 of 15
7. Question
1 points
When recovering the refrigerant, it is important to only fill the recovery cylinder to ___ of its capacity
Correct
This is to prevent the cylinder from rupturing if the refrigerant expands due to an increase in temperature
Incorrect
This is to prevent the cylinder from rupturing if the refrigerant expands due to an increase in temperature
Question 8 of 15
8. Question
1 points
Refrigerant should have higher critical pressure
Correct
The critical pressure of a refrigerant is the pressure at which the refrigerant can no longer be liquefied by increasing the pressure. A higher critical pressure means that the refrigerant can be liquefied at a higher temperature, which is desirable for refrigeration systems.
Incorrect
The critical pressure of a refrigerant is the pressure at which the refrigerant can no longer be liquefied by increasing the pressure. A higher critical pressure means that the refrigerant can be liquefied at a higher temperature, which is desirable for refrigeration systems.
Question 9 of 15
9. Question
1 points
As per ASHRAE which of the following refrigerant has non evidence of toxicity is identified:
Correct
Class A refrigerants are refrigerants for which toxicity has not been identified at concentrations of less than or equal to 400 parts per million (PPM) by volume. Examples of Class A refrigerant are: R-134a, R-410A, R-407C
Incorrect
Class A refrigerants are refrigerants for which toxicity has not been identified at concentrations of less than or equal to 400 parts per million (PPM) by volume. Examples of Class A refrigerant are: R-134a, R-410A, R-407C
Question 10 of 15
10. Question
1 points
The high molecular weight of the Freon compounds contributes to the high latent heats of vaporization
Correct
The latent heat of vaporization is the amount of heat required to change a liquid into a gas. The higher the molecular weight of a substance, the stronger the intermolecular forces between its molecules. This makes it more difficult for the molecules to escape from the liquid state and become a gas.
Incorrect
The latent heat of vaporization is the amount of heat required to change a liquid into a gas. The higher the molecular weight of a substance, the stronger the intermolecular forces between its molecules. This makes it more difficult for the molecules to escape from the liquid state and become a gas.
Question 11 of 15
11. Question
1 points
Which of the following is/are disadvantages associated with Ammonia as refrigerant:
Correct
Incorrect
Question 12 of 15
12. Question
1 points
______ has the lowest boiling temperature.
Correct
R-22 has a lower boiling point than R-11 and R-12. A lower boiling point means that the refrigerant will vaporize at a lower temperature. This is desirable for some applications, such as air conditioning, because it allows the refrigerant to absorb heat from the air at a lower temperature.
Incorrect
R-22 has a lower boiling point than R-11 and R-12. A lower boiling point means that the refrigerant will vaporize at a lower temperature. This is desirable for some applications, such as air conditioning, because it allows the refrigerant to absorb heat from the air at a lower temperature.
Question 13 of 15
13. Question
1 points
Which of the followning has the unit – ‘cubic feet per pound’:
Correct
Specific volume is the volume of a unit mass of a substance. It is the reciprocal of density.
Incorrect
Specific volume is the volume of a unit mass of a substance. It is the reciprocal of density.
Question 14 of 15
14. Question
1 points
_____ is the amount of heat required to change the refrigerant from a liquid to a gas
Correct
The amount of heat required to change the refrigerant from a liquid to a gas is called the latent heat of vaporization. The higher the latent heat of vaporization, the more heat can be removed from the air.
Incorrect
The amount of heat required to change the refrigerant from a liquid to a gas is called the latent heat of vaporization. The higher the latent heat of vaporization, the more heat can be removed from the air.
Question 15 of 15
15. Question
1 points
Which of the following is/are not desirable property associated with refrigerant:
Correct
The latent heat of vaporization of a refrigerant is the amount of heat that is absorbed by the refrigerant when it vaporizes. The higher the latent heat of vaporization, the more heat can be removed from the air by the refrigerant.
Incorrect
The latent heat of vaporization of a refrigerant is the amount of heat that is absorbed by the refrigerant when it vaporizes. The higher the latent heat of vaporization, the more heat can be removed from the air by the refrigerant.
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