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Two locations where a cold air return should be installed - Answer-open area of a wall and low to the ground Which of the following is the law of thermodynamics? - Answer-heat moves toward a place with lower intensity Sensible heat describes - Answer-how hot something feels Latent heat is measu...

Current flow is - Answer-the flow of electrons in the circuit impedance is - Answer-opposition to alternating current flow like charges - Answer-repel each other Any material that will readily release electrons is called - Answer-a conductor the symbol for current is - Answer-I Which of the fol...

Are there drop-in replacements for R-12 systems? Why or why not? - Answer-No because the new refrigerants are incompatible with the oils and lubricants used in R-12 systems. What type of oil is used in R-134a and what oils will it mix with? - Answer-Ester based oils and they do not mix with other...

An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter - Answer-voltmeter This device uses a thermal sensing bulb at the outlet of the evaporator to sense temperature and control superheat A...

Why is IAQ important? a) to provide a comfortable environment for occupants b) to provide enough oxygen for occupants c) to provide the right temperature for a productive environment for occupants d) to provide sufficient airflow for occupants e) to provide a healthy environment for occupants -...

This compressor uses pistons and valves to compressor refrigerant. - Answer-Reciprocating This compressor uses vanes to compress refrigerant. - Answer-Rotary compressor This compressor is the latest technology for compressor design - Answer-Scroll pump The manifold gauges should be in this positi...

The high and low pressures in a refrigerant system are separated by the : - Answer-COMPRESSOR & METERING DEVICE. The pressure at which the refrigerant changes state from a vapor to a liquid is the : - AnswerCONDENSING PRESSURE. A pressure gauge placed anywhere from the metering device to the comp...

Propane and Butane are _______ than air: - Answer-Heavier What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A - Answer-6 ohms Temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration sy...