NATE Core questions and answers 2023

NATE Core questions and answers 2023Class A Ordinary Extinguisher Class B Liquid Extinguisher Class C Electrical Extinguisher Asphyxiation causes what? Nausea, Dizziness, Heart Irregularities, and Unconciousness Ladder must be at what dimensions in relation to a house? 4 ft for every 1 ft, 3 ft above the top of the roof. What different amounts does Copper Tubing come in? 25, 50, 100 Soft drawn copper tubing means what? Copper tubing that is on a roll Hard drawn copper tubing means what? Copper tubing that is bought long (a stick) Type K Copper Tubing Green and thick Type L Copper Tubing Blue and medium Type M Copper Tubing Red and thin How is copper tubing measured in ACR? 1/2 in OD (Outside Dimensions) Armaflex Adhesive used with copper tubing Annealed Softened by heat treatment Flux Compound that minimizes oxidation, does NOT clean copper. Nitrogen Tank needs what? Regulator (controls tank pressure) Human Comfort is achieved by what factors? Temperature, Humidity, and Air Quality Do refrigerants expire? No What are the two types of humidifiers? Fan powered type and Bypass type Bypass Type Humidifier Open in heating/closed in cooling Specific Heat BTU/Ib/F Specific Heat of water 1 Specific Heat of ice 0.5 Infiltration Outside air seeping inside Ex-filtration Air leaking out Heat a form of energy What are the 3 types of heat energy? Mechanical, Chemical, Electrical Superheat 100% Vapor (temperature above saturation temperature) Subcooling 100% Liquid (temperature below saturation temperature) Sublimation Process of a solid changing to a vapor Potential Energy Stored Energy (dammed river) Kinetic Energy Moving Energy (river flowing) What are the 3 types of heat transfer? Conduction, Convection, Radiation