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HVAC Certification Practice Tests, Exams of Advanced Education
A collection of practice questions and answers related to hvac (heating, ventilation, and air conditioning) certification. The questions cover a wide range of topics, including properties of refrigerants, electrical circuits, refrigeration system components, and hvac system characteristics. Valuable information for individuals preparing for hvac certification exams or seeking to expand their knowledge in this field. The questions are designed to test the reader's understanding of hvac principles, troubleshooting techniques, and system operations. By studying this document, students and professionals can gain a deeper insight into the technical aspects of hvac systems and enhance their ability to diagnose and resolve issues in real-world scenarios.
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HVAC CERTIFICATION PRACTICE TESTS
Propane and Butane are _______ than air: - Heavier What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A - 6 ohms Temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration system - Floc point What manifold gauge set is used to charge, evacuate, add oil and recover refrigerant from a refrigeration and air conditioning system? - Yellow hose Where is the oil separator located? - Discharge line Higher the ambient temperatures, ____ will be the evacuation time of the refrigerants from the system - Lesser 1 Watt is equal to - 3.41 Btu's Heat that is absorbed or extracted when a substance changes its state is - Latent heat Where is the sight glass present in the refrigeration cycle? - Liquid line Which shall not be used near flammable materials? - Halide leak detector Current in a closed circuit is limited by: - Resistance When there is an increase in the heat load on the evaporator, the refrigerant will tend to evaporate at a _____ rate - Faster At what voltage is gas valve operates? - 24V Furnaces are placed into categories based upon - Venting characteristics What type of compressor uses two special helical rotors that introduce suction vapors then compress them? - Screw compressors 1 kWh of electric power is equivalent to how many Btu per hour: - 3412 A high pressure steam boiler operates at a pressure greater than - 15 psig