What is superheat Study guides, Class notes & Summaries

2024 update DC Third testing Questions and Answers 100% Pass The component in which liquid vapor by absorbing heat is called? - Correct Answer ️️ - Evaporator Select the best answer electrical grounding method? - Correct Answer ️️ -Metal stake drive 8 foot into the ground. A _____ valve should be used for throttling purpose? - Correct Answer ️️ -Globe What is the acceptable range for residual sodium sulfite in the boiler maintain? - Correct Answer ️️ -30-70 What is the B...

ESCO Light Commercial Refrigeration EXAM 2024/2025 with Complete Solutions. 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 t...

BOMA – HVAC QUESTIONS AND ANSWERS 100% PASS Two basic categories of chillers are the compression cycle and absorption The five requirements for comfort are proper temperature, humidity, filtration, and ventilation circulation The primary function of an expansion device is to produce a reduction in the pressure on the liquid refrigerant, regulate the flow of refrigerant into the evaporator, lower the boiling point of the refrigerant far enough below the temperature of the load to g...

What date was the sale of CFC's & HCFC's restricted to technicians certified in refrigerant recovery? - Correct answer-November 14, 1994 Section 608 of the Federal Clean Air Act requires technicians to what? - Correct answer-Recover all refrigerants. The objective of the Clean Air Act is to protect what? - Correct answer-The earth's stratosphere. HFC's - Correct answer-HydroFlouroCarbon's CFC's - Correct answer-ChloroFluoroCarbon's ODP - Correct answer-Ozone Depletion Potential Which in...

Z-51 Written Exam Questions and Complete Solutions In a steam turbine, what is the function of a Kingsbury thrust bearing? A) Maintain first stage steam pressure. B) Compensate for coupling misalignment. C) Adjust shaft torque at start up. D) Maintain axial positioning of the rotor shaft. - Answer: D) Maintain axial positioning of the rotor shaft. The ratio of actual pressure of water pressure in the atmosphere to the saturated pressure of given temperature is A) partial pressure....

Refrigeration Excellence Questions and Answers Already Passed 8. Dry type evaporators operate most efficiently with the superheat setting of approximately A. 8°F to 12°F B. 13°F to 19°F C. 20°F to 30°F D. 31°F to 40°F A. 8°F to 12°F 9. An evaporator used to chill liquids is operating within normal superheat setting. But the system is not cooling the product properly. Which of the following is most likely the cause? A. Overcharge of refrigerant B. Undercharge of refr...

HVAC NATE Heat Pump Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A Q: What is the absolute pressure at sea level if a gauge pressure is 35 psig? Answer: 49.7psia Q: 100,000 BTUH output furnace. Return air temp is 65F. Supply air is 135F. What is the CFM? Answer: 1323CFM Q: What is the best method of repair when a residential supply diffuser is noisy because of a loose vane? Answer: Replace the diffuser. Q: When...

HVAC pre-test questions and answers graded A+ Two basic categories of chillers are Compression cycle and absorption The 5 requirements for comfort are temperature, humidity, filtration, ventilation and _______ Circulation The primary function of an expansion device is to: Reduce pressure on liquid refrig, regulate flow, lower the boiling point below the temp of the load All of the above The wet-bulb depression is The difference between the dry-bulb and wet-bulb temperatures T...

Commercial Refrigeration Certification AccuratIn 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:...

MCC HVAC MIDTERM EXAM QUESTIONS AND ANSWERS 100% PASS List at least five factors that must be controlled if a comfortable indoor environment is to be maintained. - Correct Answer ️️ -The factors that must be controlled include temperature, humidity, air motion, dust, bacteria, odors, toxic gases, and ionization. ((Ref: 1/1)) Describe in simple terms the basic process by which a refrigerant transfers heat energy. - Correct Answer ️️ -A refrigerant is used to transfer heat when it c...