Quiz-summary
0 of 15 questions completed
Questions:
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
Information
Refrigeration Basics Quiz Questions 5: HVAC Basics Questions Answers
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 15 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
| Average score |
|
| Your score |
|
Categories
- Not categorized 0%
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- Answered
- Review
-
Question 1 of 15
1. Question
1 pointsAs the ambient temperature of a refrigeration system increases, the compressor efficiency:
Correct
As the ambient temperature increases, more energy the compressor has to use to compress the air, which reduces the efficiency of the compressor
Incorrect
As the ambient temperature increases, more energy the compressor has to use to compress the air, which reduces the efficiency of the compressor
-
Question 2 of 15
2. Question
1 pointsThe TXV senses the temperature of the refrigerant in the _______ and opens or closes the valve to regulate the flow of refrigerant:
Correct
The thermostatic expansion valve (TXV) is an important part of the refrigeration system which measures the temperature of refrigerant at evoparator and regulates the flow of refrigerant to evaporator helping to ensure that the evaporator is properly cooled. Thereby improving performance of refrigeration system
Incorrect
The thermostatic expansion valve (TXV) is an important part of the refrigeration system which measures the temperature of refrigerant at evoparator and regulates the flow of refrigerant to evaporator helping to ensure that the evaporator is properly cooled. Thereby improving performance of refrigeration system
-
Question 3 of 15
3. Question
1 pointsLow discharge pressure of refrigerant in the condenser can lead to ______ cooling capacity
Correct
If the discharge pressure of the refigerant is too low, the condenser will not be able to remove as much heat. This can lead to the refrigerant not being able to absorb as much heat in the evaporator, which results in reducion in the the cooling capacity of the system
Incorrect
If the discharge pressure of the refigerant is too low, the condenser will not be able to remove as much heat. This can lead to the refrigerant not being able to absorb as much heat in the evaporator, which results in reducion in the the cooling capacity of the system
-
Question 4 of 15
4. Question
1 pointsInside the condenser or in the liquid line, when liquid is sub-cooled, then there is no change in pressure:
Correct
Sub-cooling is the process of cooling a liquid refrigerant below its saturation temperature. This is done by removing heat from the refrigerant after it has been condensed. In sub-cooling process does not involve any change in state. Therefore there is no change in pressure
Incorrect
Sub-cooling is the process of cooling a liquid refrigerant below its saturation temperature. This is done by removing heat from the refrigerant after it has been condensed. In sub-cooling process does not involve any change in state. Therefore there is no change in pressure
-
Question 5 of 15
5. Question
1 pointsThe compression ratio _______ when the evaporating temperature rises:
Correct
The compression ratio is the ratio of the pressure of the refrigerant in the condenser to the pressure of the refrigerant in the evaporator. The higher the evaporating temperature, the more energy is required to compress the refrigerant, which increases the compression ratio.
Incorrect
The compression ratio is the ratio of the pressure of the refrigerant in the condenser to the pressure of the refrigerant in the evaporator. The higher the evaporating temperature, the more energy is required to compress the refrigerant, which increases the compression ratio.
-
Question 6 of 15
6. Question
1 pointsThe volumetric efficiency of the compressor reduces as the evaporating temperature ______
Correct
As the evaporating temperature (suction temperature) decreases, the density of the refrigerant vapor at the compressor inlet also decreases. This means that there is less mass of refrigerant available for the compressor to draw in per unit of time. Consequently, the compressor’s ability to compress the refrigerant decreases, resulting in reduced volumetric efficiency.
Incorrect
As the evaporating temperature (suction temperature) decreases, the density of the refrigerant vapor at the compressor inlet also decreases. This means that there is less mass of refrigerant available for the compressor to draw in per unit of time. Consequently, the compressor’s ability to compress the refrigerant decreases, resulting in reduced volumetric efficiency.
-
Question 7 of 15
7. Question
1 pointsMost of the CFCs refrigerants are not miscible with mineral oils:
Correct
Miscibility refers to the ability of two substances to mix and form a homogeneous solution. Mineral oils are commonly used as lubricants in refrigeration systems. Most CFC refrigerants are miscible with mineral oils. Lack of miscibility may lead to several issues in refrigeration systems. It can result in inadequate lubrication of compressor components, which may lead to increased wear and tear, reduced efficiency, and potential compressor damage.
Incorrect
Miscibility refers to the ability of two substances to mix and form a homogeneous solution. Mineral oils are commonly used as lubricants in refrigeration systems. Most CFC refrigerants are miscible with mineral oils. Lack of miscibility may lead to several issues in refrigeration systems. It can result in inadequate lubrication of compressor components, which may lead to increased wear and tear, reduced efficiency, and potential compressor damage.
-
Question 8 of 15
8. Question
1 pointsWhen Compressor oil mixes with water, it may lead to which of the following:
Correct
Incorrect
-
Question 9 of 15
9. Question
1 pointsThe ____ side float chamber is located between the condenser and evaporator:
Correct
The float chamber is used to maintain a constant level of refrigerant in the system. The float chamber is filled with refrigerant and oil. The high-side float chamber is located between the condenser and evaporator (high-pressure side) in a refrigeration system.
Incorrect
The float chamber is used to maintain a constant level of refrigerant in the system. The float chamber is filled with refrigerant and oil. The high-side float chamber is located between the condenser and evaporator (high-pressure side) in a refrigeration system.
-
Question 10 of 15
10. Question
1 points______ valves are operated using an electromagnet consisting of a coil of wire placed on an iron spool which is fixed over the valve body used to control the flow of refrigerant:
Correct
A solenoid valve is a type of valve that is controlled by an electric current. Solenoid valves are commonly used in refrigeration systems and are located in the liquid line to control the flow of refrigerant.
Incorrect
A solenoid valve is a type of valve that is controlled by an electric current. Solenoid valves are commonly used in refrigeration systems and are located in the liquid line to control the flow of refrigerant.
-
Question 11 of 15
11. Question
1 pointsWhen exposed directly to high temperatures, will Fluorocarbons decompose :
Correct
Fluorocarbons are stable at room temperature, but they can decompose when exposed to high temperatures. When fluorocarbons decompose, they release harmful gases into the atmosphere. These gases can contribute to climate change and ozone depletion.
Incorrect
Fluorocarbons are stable at room temperature, but they can decompose when exposed to high temperatures. When fluorocarbons decompose, they release harmful gases into the atmosphere. These gases can contribute to climate change and ozone depletion.
-
Question 12 of 15
12. Question
1 pointsR-12 and R-22 have the highest specific volumes as vapors:
Correct
The specific volume of a vapor is the volume occupied by one unit mass of the vapor. The specific volumes of R-12 and R-22 are lower than the specific volumes of many other refrigerants, such as R-134a, R-410a, and R-404A.
Incorrect
The specific volume of a vapor is the volume occupied by one unit mass of the vapor. The specific volumes of R-12 and R-22 are lower than the specific volumes of many other refrigerants, such as R-134a, R-410a, and R-404A.
-
Question 13 of 15
13. Question
1 pointsWhich of the following gas is used for purging air from refrigeration systems:
Correct
Nitrogen is an inert gas, meaning it does not react with other substances. This makes it a good choice for purging air from refrigeration systems.
Incorrect
Nitrogen is an inert gas, meaning it does not react with other substances. This makes it a good choice for purging air from refrigeration systems.
-
Question 14 of 15
14. Question
1 pointsWhich of the following blended refrigerant can be used to substitute for R-12:
Correct
R401A is a HFC. It has similar properties to R-12, including a boiling point and a critical temperature. It is also non-ozone-depleting.
Incorrect
R401A is a HFC. It has similar properties to R-12, including a boiling point and a critical temperature. It is also non-ozone-depleting.
-
Question 15 of 15
15. Question
1 pointsAt condenser refrigerant changes from ______ to _______ :
Correct
The condenser in the refrigeration system is responsible for removing heat from the refrigerant. The refrigerant enters the condenser as a high-pressure vapor from the compressor and is cooled by air or water at the condenser. As the refrigerant cools, it condenses into a high-pressure liquid.
Incorrect
The condenser in the refrigeration system is responsible for removing heat from the refrigerant. The refrigerant enters the condenser as a high-pressure vapor from the compressor and is cooled by air or water at the condenser. As the refrigerant cools, it condenses into a high-pressure liquid.