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Refrigeration Excellence Complete Questions & Answers!!
1. In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: A. Operate at high-efficiency B. Ensure that Frost is not accumulate C. Subcool the compressor D. Ensure proper oil return - ANSWER A. Operate at high-efficiency 2. The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at the evaporator outlet is known as A. Evaporator superheat B. Latent heat C. Eva...
- Exam (elaborations)
- • 16 pages •
1. In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: A. Operate at high-efficiency B. Ensure that Frost is not accumulate C. Subcool the compressor D. Ensure proper oil return - ANSWER A. Operate at high-efficiency 2. The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at the evaporator outlet is known as A. Evaporator superheat B. Latent heat C. Eva...
Commercial Air Conditioning Questions & Answers!!
How a pump down system works - ANSWER the thermostat will open at the set temperature it controls the liquid line solenoid valve the valve will close and the system will pump down and the low pressure switch will open and turn off the compressor see unit 21 pump down cycle and unit 25/ 25.18 automatic pumpdowm systems No oil trap in the discharge line can cause - ANSWER compressor valve damage if the condenser is on the roof no oil getting back to the compressor see internet oil trap If th...
- Exam (elaborations)
- • 7 pages •
How a pump down system works - ANSWER the thermostat will open at the set temperature it controls the liquid line solenoid valve the valve will close and the system will pump down and the low pressure switch will open and turn off the compressor see unit 21 pump down cycle and unit 25/ 25.18 automatic pumpdowm systems No oil trap in the discharge line can cause - ANSWER compressor valve damage if the condenser is on the roof no oil getting back to the compressor see internet oil trap If th...
Commercial Refrigeration Exam I Correct 100%
5% - ANSWER If converting from mineral oil to POE oil, what is considered to be the industry standard for residual mineral oil content? Refractometer Oil conversion test kit - ANSWER When converting to POE from mineral oil, what can be used to determine residual mineral oil content? Global warming potential (GWP) - ANSWER Some refrigerants are now being phased out due to their HCFC - ANSWER Which currently used refrigerant category is quickly disappearing due to its ozone depletion p...
- Exam (elaborations)
- • 11 pages •
5% - ANSWER If converting from mineral oil to POE oil, what is considered to be the industry standard for residual mineral oil content? Refractometer Oil conversion test kit - ANSWER When converting to POE from mineral oil, what can be used to determine residual mineral oil content? Global warming potential (GWP) - ANSWER Some refrigerants are now being phased out due to their HCFC - ANSWER Which currently used refrigerant category is quickly disappearing due to its ozone depletion p...
Refrigeration ESCO Latest Update 2024/2025
Heat which is added to a vapor after the change of state occurs is called - ANSWER superheat A refrigerant gives up heat when; - ANSWER it condenses it is desirable for refrigerant in the suction line to be slightly superheated in order to... - ANSWER ensure liquid refrigerant does not enter the compressor state of refrigerant in the suction line should be... - ANSWER low pressure/ low temperature vapor state of refrigerant entering the condenser is... - ANSWER high pressure/ highly ...
- Exam (elaborations)
- • 7 pages •
Heat which is added to a vapor after the change of state occurs is called - ANSWER superheat A refrigerant gives up heat when; - ANSWER it condenses it is desirable for refrigerant in the suction line to be slightly superheated in order to... - ANSWER ensure liquid refrigerant does not enter the compressor state of refrigerant in the suction line should be... - ANSWER low pressure/ low temperature vapor state of refrigerant entering the condenser is... - ANSWER high pressure/ highly ...
Commercial Refrigeration FINAL TEST Questions & Answers(RATED A)
How is the cooling effect in a mechanical refrigeration system produced? - ANSWER Evaporation of liquid refrigerant into vapor What is the primary purpose of a compressor? - ANSWER It circulates and pressurizes the refrigerant vapor before the vapor Is condensed for re use Name another function that must be performed by the compressor - ANSWER Is raise the pressure and temperature of the refrigerant vapor. This allows the refrigerant to condense into a liquid as it circulates through the c...
- Exam (elaborations)
- • 7 pages •
How is the cooling effect in a mechanical refrigeration system produced? - ANSWER Evaporation of liquid refrigerant into vapor What is the primary purpose of a compressor? - ANSWER It circulates and pressurizes the refrigerant vapor before the vapor Is condensed for re use Name another function that must be performed by the compressor - ANSWER Is raise the pressure and temperature of the refrigerant vapor. This allows the refrigerant to condense into a liquid as it circulates through the c...
Commercial Refrigeration Certification Correct 100%
In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: A. operate at high efficiency. B. ensure that frost does not accumulate. C. sub-cool the compressor. D. ensure proper oil return. - ANSWER A. operate at high efficiency. The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at the evaporator outlet is known as: A. evaporator superheat. B. latent heat. C...
- Exam (elaborations)
- • 16 pages •
In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: A. operate at high efficiency. B. ensure that frost does not accumulate. C. sub-cool the compressor. D. ensure proper oil return. - ANSWER A. operate at high efficiency. The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at the evaporator outlet is known as: A. evaporator superheat. B. latent heat. C...
Heat Pump ESCO Correct 100%
An air-to-air heat pump has many of the same components as an air conditioning system. The major difference is that a heat pump also has an - ANSWER Reversing valve What is the difference between "demand defrost" and "timed defrost"? - ANSWER Demand defrost happens only when needed and timed defrost is based on time/temperature. The thermostat that controls the auxiliary electric heat according to the outdoor temperature is called the; - ANSWER Outdoor ambient thermostat The outdoor...
- Exam (elaborations)
- • 8 pages •
An air-to-air heat pump has many of the same components as an air conditioning system. The major difference is that a heat pump also has an - ANSWER Reversing valve What is the difference between "demand defrost" and "timed defrost"? - ANSWER Demand defrost happens only when needed and timed defrost is based on time/temperature. The thermostat that controls the auxiliary electric heat according to the outdoor temperature is called the; - ANSWER Outdoor ambient thermostat The outdoor...
MACS 609 CERTIFICATION Correct 100%
If lubricant is removed by recovery equipment during system refrigerant removal, what must be done with the lubricant? - ANSWER Re-install lubricant removed by the recovery equipment Before reuse, what must be done with HFC-134a that has been recovered from a mobile A/C system using recovery-only equipment? - ANSWER Question 2 options: Recycle the HFC-134a before reuse using certified equipment When can HFC-134a become combustible in a mobile air conditioning system? - ANSWER If shop air ...
- Exam (elaborations)
- • 2 pages •
If lubricant is removed by recovery equipment during system refrigerant removal, what must be done with the lubricant? - ANSWER Re-install lubricant removed by the recovery equipment Before reuse, what must be done with HFC-134a that has been recovered from a mobile A/C system using recovery-only equipment? - ANSWER Question 2 options: Recycle the HFC-134a before reuse using certified equipment When can HFC-134a become combustible in a mobile air conditioning system? - ANSWER If shop air ...
Esco Electrical Test Correct 100%
What is current flow? - ANSWER D.The flow of electrons in a circuit What is impedance? - ANSWER A.Opposition to alternating current Like charges will - ANSWER B.Repel each other Any material that will readily release electrons is called: - ANSWER B.A conductor The symbol for current is: - ANSWER B. I Electricity can produce: - ANSWER D. All the above light heat magnetism The safety ground conductor is usually colored: - ANSWER B.Green An electron has: - ANSWER B.A nega...
- Exam (elaborations)
- • 7 pages •
What is current flow? - ANSWER D.The flow of electrons in a circuit What is impedance? - ANSWER A.Opposition to alternating current Like charges will - ANSWER B.Repel each other Any material that will readily release electrons is called: - ANSWER B.A conductor The symbol for current is: - ANSWER B. I Electricity can produce: - ANSWER D. All the above light heat magnetism The safety ground conductor is usually colored: - ANSWER B.Green An electron has: - ANSWER B.A nega...
ESCO Air Conditioning Exam Accurate 100%
Heat which causes a change in temperature of a substance is called - ANSWER Sensible heat Heat added to a substance without a rise in temperature - ANSWER Latent heat Heat added to the refrigerant in a vapor state after the evaporation process is called - ANSWER Superheat Scroll compressor move refrigerant by - ANSWER Involute Spirals The movement of heat by way of fluid is called - ANSWER Convection The movement of heat by direct contact is - ANSWER Conduction The standard uni...
- Exam (elaborations)
- • 7 pages •
Heat which causes a change in temperature of a substance is called - ANSWER Sensible heat Heat added to a substance without a rise in temperature - ANSWER Latent heat Heat added to the refrigerant in a vapor state after the evaporation process is called - ANSWER Superheat Scroll compressor move refrigerant by - ANSWER Involute Spirals The movement of heat by way of fluid is called - ANSWER Convection The movement of heat by direct contact is - ANSWER Conduction The standard uni...
GFEBS Real Property Post Assessment 3.0 Correct 100
AP Bio Practice Exam 1 Correct 100%
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Wall Street Prep Financial Statement Modeling Correct 100%
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