Study guides, Class notes & Summaries

ESCO TEST STUDY GUIDE QUESTIONS AND ANSWERS 100% SOLVED The symbol or letter for impedance is ️️z The NEC and NFPA have designated ____ as ground ️️green Watts formula ️️P = I x E (W = VA) Ohmmeters measure resistance and ___ be used in a live circuit, therefore ____ ️️cannot, must have its own power source Fuses are sized by ️️Volts and Amps Two 120 volt A/C incandescent light bulbs are wired in series; one is a 60 watt bulb and the other is a 4 watt bulb, which ...

HVAC - Residential Air Test Questions and Answers 100% Solved What three environmental conditions have the most effect on comfort? ️️Temperature, humidity, and air movement. Why does the air's relative humidity affect comfort? ️️Relative humidity affects how rapidly perspiration can evaporate. In the heating season, the comfort level can be improved at lower temperatures by: ️️Adding humidity to the air. In the cooling season, the comfort level can be improved at higher ...

HVAC EXCELLENCE TEST QUESTIONS AND ANSWERS 100% SOLVED Heat which causes a change in temperature of a substance is called ️️sensible heat, Heat added to a substance without a rise in temperature; (example: liquid refrigerant to gas) this process la called? ️️latent heat Heat added to the refrigerant in vapor state after the evaporation process is called, ️️superheat A scroll compressor moves refrigerant by means of; ️️involute spirals The movement of heat by way of flu...

R410a Test Questions and Answers 100% Solved Recovery cylinders used with R410 must have a DOT rating of... ️️DOT 4BA 400 DOT 4BW 400 When charging an R410a system that uses a thermostatic expansion valve, proper charge can be determined by measuring... ️️Subcooling When charging an R410a system that uses a capillary tube or a fixed metering device, proper charge can be determined by measuring... ️️Superheat Compressor internal pressure relief settings for R410a systems ar...

R410a Test Questions and Answers 100% Solved Recovery cylinders used with R410 must have a DOT rating of... ️️DOT 4BA 400 DOT 4BW 400 When charging an R410a system that uses a thermostatic expansion valve, proper charge can be determined by measuring... ️️Subcooling When charging an R410a system that uses a capillary tube or a fixed metering device, proper charge can be determined by measuring... ️️Superheat Compressor internal pressure relief settings for R410a systems ar...

R-410a Refrigerant Study Guide Questions and Answers 100% Solved R-410A is a Refrigerant, also known as....? ️️SUVA - 410A....... AZ-20......Puron The cylinder color code for R-410A is...? ️️Rose HCFC-22 is scheduled for total phase out, by the year? ️️2020 Suction and Discharge pressures for R-410A are how much higher than R-22 Systems? ️️40% to 70% What is Temperature Glide? ️️A range of condensing and evaporating temperatures for one pressure. When handling Ref...

HVAC Final Exam Electrical For Air Conditioning Questions and Answers 100% Solved When using a low voltage T-stat for heating and cooling, when would there be a jumper between Rh and Rc? Select one: a. When using a single transformer system b. When heating with an oil boiler c. When heating with a gas boiler d. When using a two transformer system ️️A) When Using a single transformer system Digital thermostats usually display temperature, time of day, programming and operating

NATE Heat Pump Exam with Complete Solutions Charging a heat pump with refrigerant is best accomplished in the _______ mode. A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode ️️B: Cooling mode Heat pumps can provide both heating in the winter and cooling in the summer. In which mode is the heat pump more efficient? A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode ️️A: Heating mode Which of the following components is exclusiv...

Gas Heat ESCO exam with Complete Solutions 100% Verified A gas furnace to be installed in a garage. The national standards requires that the burners and ignition must be located ____ above the floor: ️️18 inches A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is: ️️Temperature on/ Temperature off Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds: ️️13.5 in W.C. (or 1/2 psi) This is the maximum pres...

HVAC: EPA 608 Certification Study Guide Questions and Answers 100% Solved Are there drop-in replacements for R-12 systems? Why or why not? ️️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? ️️Ester based oils and they do not mix with other oils What type of lubricant is used with HCFCs? ️️Alkylbenzene lubricant What is difference b/w ternary blend a azeotropi...