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Refrigeration Basics Quiz Questions Answers 4: HVAC Basics
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Question 1 of 16
1. Question
1 pointsThe expansion device is typically located at the end of the ______ :
Correct
Liquid line carries the liquid refrigerant from the condenser to the expansion valve.
Incorrect
Liquid line carries the liquid refrigerant from the condenser to the expansion valve.
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Question 2 of 16
2. Question
1 pointsThe temperature at which the oil ceases to flow is ________:
Correct
The pour point of an oil is the lowest temperature at which it will flow under gravity.
Incorrect
The pour point of an oil is the lowest temperature at which it will flow under gravity.
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Question 3 of 16
3. Question
1 pointsIn which of the following compressor, the piston moves alternatively downwards and upwards in a cylinder:
Correct
The piston moves alternatively downwards and upwards in a cylinder in a Reciprocating compressor.
Incorrect
The piston moves alternatively downwards and upwards in a cylinder in a Reciprocating compressor.
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Question 4 of 16
4. Question
1 pointsIn case of capacitor start capacitor run motor, the capacitors are placed for which of the following:
Correct
Capacitors are provided for providing high starting torque of the motor for better acceleration during starting and improving power factor during running for improving the efficiency of the motor
Incorrect
Capacitors are provided for providing high starting torque of the motor for better acceleration during starting and improving power factor during running for improving the efficiency of the motor
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Question 5 of 16
5. Question
1 pointsIf the discharge pressure goes up in a compressor, the compression ratio of the compressor will ______:
Correct
Compression ratio is the ratio of the absolute discharge pressure to the absolute suction pressure. As the discharge pressure goes up, the ratio of the two pressures also increasess result in increase in compression ratio. Higher the compression ratio, higher will be the cooling capacity of compressor but also result in higher temperature and pressure inside the compressor
Incorrect
Compression ratio is the ratio of the absolute discharge pressure to the absolute suction pressure. As the discharge pressure goes up, the ratio of the two pressures also increasess result in increase in compression ratio. Higher the compression ratio, higher will be the cooling capacity of compressor but also result in higher temperature and pressure inside the compressor
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Question 6 of 16
6. Question
1 pointsIn refrigeration system which of the following is not correct about Centrifugal Compressors compared to Reciprocating Compressor :
Correct
Incorrect
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Question 7 of 16
7. Question
1 pointsAs the superheat of the suction gas increases, the hp per ton of the refrigeration system _______:
Correct
Compressor has to work harder to compress the gas when it is hotter. The higher the superheat, the more work the compressor has to do, and the lower will be the hp/ton of the refrigeration system
Incorrect
Compressor has to work harder to compress the gas when it is hotter. The higher the superheat, the more work the compressor has to do, and the lower will be the hp/ton of the refrigeration system
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Question 8 of 16
8. Question
1 pointsMollier diagram chart shows relation between which of the following:
Correct
A Mollier diagram is a thermodynamic chart that shows the relationship between the enthalpy, entropy, and pressure of a substance.
Incorrect
A Mollier diagram is a thermodynamic chart that shows the relationship between the enthalpy, entropy, and pressure of a substance.
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Question 9 of 16
9. Question
1 pointsVapor can be present in the liquid line, if there is _______ pressure drop in the liquid line:
Correct
If there is a significant pressure drop in the liquid line, refrigerant will vaporize in liquid line connecing condenser and expansion valve. Huge pressure drop can be casued due to decrease in flow rate, increase in temperature of refrigerant or any restrictions in liquid line
Incorrect
If there is a significant pressure drop in the liquid line, refrigerant will vaporize in liquid line connecing condenser and expansion valve. Huge pressure drop can be casued due to decrease in flow rate, increase in temperature of refrigerant or any restrictions in liquid line
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Question 10 of 16
10. Question
1 pointsIn a refrigeration system, refrigerant should be in ______ condition in the evaporator:
Correct
In the evaporator, the refrigerant absorbs heat from the surrounding air or substance, causing it to vaporize. Refrigerant should be in a state where it is just about to turn into a liquid.
Incorrect
In the evaporator, the refrigerant absorbs heat from the surrounding air or substance, causing it to vaporize. Refrigerant should be in a state where it is just about to turn into a liquid.
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Question 11 of 16
11. Question
1 points_____ is the weight of the moisture in the unit mass of dry air:
Correct
Incorrect
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Question 12 of 16
12. Question
1 pointsCharle’s law is applicable to which of the following:
Correct
Incorrect
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Question 13 of 16
13. Question
1 pointsAs the temperature of the substance being cooled falls, the evaporator refrigerant pressure will _____:
Correct
As the temperature of the substance being cooled falls, the pressure of the refrigerant in the evaporator will decrease. This is because the refrigerant will vaporize at a lower pressure at lower temperatures.
Incorrect
As the temperature of the substance being cooled falls, the pressure of the refrigerant in the evaporator will decrease. This is because the refrigerant will vaporize at a lower pressure at lower temperatures.
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Question 14 of 16
14. Question
1 pointsThe amount of the heat that the condenser rejects is always _____ than the heat removed in the evaporator:
Correct
condenser has to reject the heat that was absorbed by the refrigerant in the evaporator, plus the heat that was generated by the compressor
Incorrect
condenser has to reject the heat that was absorbed by the refrigerant in the evaporator, plus the heat that was generated by the compressor
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Question 15 of 16
15. Question
1 pointsIn Shell and tube condenser, refrigerant flows through the _____ side:
Correct
The refrigerant flows through the tubes, and the cooling medium flows around the tubes. The cooling medium can be air or water.
Incorrect
The refrigerant flows through the tubes, and the cooling medium flows around the tubes. The cooling medium can be air or water.
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Question 16 of 16
16. Question
1 pointsFilter drier is located in the ____ of the refrigeration system:
Correct
The filter drier is a device that removes moisture and contaminants from the refrigerant. The filter drier is located in the liquid line of the refrigeration system. The liquid line is the pipe that carries the liquid refrigerant from the condenser to the expansion valve.
Incorrect
The filter drier is a device that removes moisture and contaminants from the refrigerant. The filter drier is located in the liquid line of the refrigeration system. The liquid line is the pipe that carries the liquid refrigerant from the condenser to the expansion valve.