Trades Exam Prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Differences between forward-curved and backward-inclined fan blades including overloading characteristics - Direct drive vs belt drive speed adjustments and sheave ratio principles - How ECM motors adjust torque and RPM under rising static pressure - Interpreting fan curves, airflow performance tables, and total external static pressure - Applying the three Fan Laws to calculate changes in CFM, static pressure, and motor horsepower For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How ACCA Manual D equivalent length and fitting friction impact total available static pressure and system airflow - The operational effects of supply and return airflow imbalance on building pressure and comfort - How return duct leakage increases sensible and latent system heat loads while supply leakage wastes cooling capacity - Code requirements for duct insulation, UL 181 vapor retarder sealing, and flexible duct support spacing - How zoning dampers affect static pressure and why disconnected returns create combustion safety hazards For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to measure and calculate total external static pressure by combining supply and return pressure magnitudes. - How to determine airflow CFM using manufacturer blower performance tables and speed taps. - The fundamental duct calculation formula relating CFM, velocity in FPM, and cross-sectional area. - Differences in blower performance between PSC and ECM motors under high static pressure conditions. - How to diagnose low airflow issues before mistakenly assuming a system has incorrect refrigerant charge. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to differentiate sensible capacity from latent capacity and calculate total system capacity - How to calculate the Sensible Heat Ratio using sensible capacity divided by total capacity - Why oversized HVAC equipment creates short-cycling issues where acceptable dry-bulb temperature masks high relative humidity - Common NATE exam traps involving latent loads, grains of moisture, and wet-bulb versus dry-bulb temperature readings - The exam mental shortcut Sensible Shifts the Thermometer, Latent Liquidates Moisture for quick concept recall For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Key difference between relative humidity and humidity ratio on NATE exam questions - How to locate the saturation curve where dry bulb, wet bulb, and dew point align - Calculating total heat removal using enthalpy changes across an evaporator coil - Diagnosing humidity and comfort complaints caused by improper airflow or coil temperature - A quick mnemonic shortcut to remember how dew point tracks absolute moisture content For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to apply the seven-step electrical troubleshooting sequence from visual inspection through final operational testing. - How to systematically test 24V control signals and series safety switches to pinpoint open limits and pressure controls. - How to distinguish between open, shorted, grounded, and high-resistance electrical fault patterns on NATE exam schematics. - How to use the VIC SLAC mnemonic to quickly recall the correct order of troubleshooting steps during testing. - How to avoid common exam traps such as voltage verification before resistance testing and evaluating voltage drops across contacts. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to apply the Live-Dead-Live verification protocol before testing unenergized electrical circuits - How to interpret voltage drop across closed versus open contacts on NATE exam scenarios - Why isolating components is mandatory during resistance, continuity, and capacitance testing - Proper clamp-on ammeter placement to prevent magnetic field cancellation and false zero readings - How to test run capacitors and motor insulation using megohmmeters within allowable tolerances For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How schematics represent all switches and contacts in their de-energized shelf state on NATE exam diagrams - The operational differences between line voltage loads and low voltage control circuits - Terminal identification standards for thermostats and compressor windings - The difference between logical ladder schematics and physical pictorial wiring diagrams - How to trace current paths from power rail to common to isolate open safety switches and faulty loads For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Core 24-volt thermostat terminal assignments for R, C, W, Y, and G in heating and cooling control loops - Crucial differences between O and B reversing valve energization logic for heat pump systems - Thermostat fan control behavior in gas furnaces versus electric heating and heat pump applications - Structural distinctions between conventional 24-volt relay control logic and digital communicating systems - Terminal-to-terminal multimeter voltage reading interpretation for diagnosing open and closed control switches For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Distinction between relays, contactors, and sequencers in HVAC control applications - How normally open and normally closed contacts behave in schematic diagrams - Staging electric heating elements and fan operation using timing sequencers - Function and series wiring of high limits, pressure switches, and safety interlocks - Step-by-step method to trace low voltage control inputs to line voltage load responses For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to calculate maximum secondary amperage using transformer VA ratings and turns ratio formulas - The impact of incorrect primary multi-tap wiring on low-voltage output and contactor reliability - Requirements for secondary grounding and Class 2 overcurrent protection under NEC Article 725 - How to accurately interpret meter readings across open fuses and identify common exam trap choices - A safe step-by-step troubleshooting sequence to isolate low-voltage shorts without bypassing protection For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Key operational differences between shaded-pole, PSC, and ECM motors tested on the NATE exam. - How to calculate resistance across common, run, and start terminals to identify compressor connections. - Operating principles of potential relays versus current relays, including back-EMF pickup and contact states. - Critical rules for capacitor replacement, microfarad sizing, voltage ratings, and dual-capacitor terminal wiring. - Safe capacitor discharge procedures using bleeder resistors and motor shaft rotation orientation standard. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How frequency and inductance create counter electromotive force and inductive reactance in HVAC motor windings. - How to apply the ELI the ICE man mnemonic to remember voltage and current phase relationships in inductive and capacitive circuits. - The distinction between pure resistance, inductive reactance, and total circuit impedance measured in ohms. - How to differentiate between real power in watts and apparent power in volt-amps on NATE exam calculations. - The concept of power factor and how run capacitors reduce reactive current to improve motor operating efficiency. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Voltage drop rules for closed versus open switches in series control circuits - How current and voltage behave across parallel loads versus series safety devices - Resistance calculations for series and parallel HVAC electrical paths - Troubleshooting symptoms of open circuits, short circuits, and high-resistance connections - The operation and electrical behavior of electric heat elements connected in parallel For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to apply Ohm's Law and Watt's Law to calculate voltage, current, resistance, and power in HVAC circuits. - Why a ten percent drop in voltage results in a nineteen percent loss in resistive heating power output. - How to interpret voltage drop readings across closed contactor contacts to identify high-resistance faults. - Essential safety and technical procedures for measuring resistance and continuity without damaging digital multimeters. - How to apply the memorable mnemonic Volts Push, Amps Flow, Ohms Slow, Watts Grow to master electrical troubleshooting on test day. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to correctly convert temperature between Fahrenheit, Celsius, and absolute Rankine scales on NATE questions. - The vital difference between PSIG and PSIA and when to add 14.7 for gas law equations. - How to calculate airflow CFM from electric heat kilowatts using sensible heat formulas. - A units-first calculation strategy using the mnemonic Units Direct The Route to avoid order-of-operation mistakes. - Why manufacturer instructions take priority over generic rules of thumb on code and fundamentals questions. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Key differences between complete and incomplete combustion and primary versus secondary air requirements. - Unconfined space volume rules per NFPA 54 requiring 50 cubic feet per 1,000 BTU per hour total input. - Flame diagnostics for identifying yellow tipping, floating flames, and cracked heat exchanger indicators. - Venting system classifications for Category I and Category IV systems along with draft spillage testing procedures. - Emergency safety action protocols when flue gas CO exceeds 400 ppm air-free or active spillage occurs. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Suction line velocity requirements to ensure proper oil return to the compressor crankcase. - Why liquid lines are generally uninsulated except when passing through high temperature ambient spaces. - Trap placement rules for vertical suction risers to prevent compressor oil starvation. - The critical role of dry nitrogen purging during brazing to eliminate internal scale oxidation. - Proper tubing support intervals and vibration protection to avoid refrigerant leaks. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to calculate evaporator superheat, total superheat, and condenser subcooling using temperature readings and P-T pressure conversions. - What high and low superheat or subcooling values reveal about system charge, liquid floodback, and operating efficiency. - How to choose between superheat charging for fixed orifice devices and subcooling charging for TXV systems. - How to spot critical exam traps like identifying a liquid line restriction when both high superheat and high subcooling occur. - Why charging targets depend strictly on equipment design and manufacturer data rather than rule-of-thumb estimates. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How saturation temperature, boiling, and condensing function at thermodynamic equilibrium on NATE exam questions - The critical distinction between gauge pressure in PSIG and absolute pressure in PSIA, including atmospheric math traps - Practical high-side and low-side system examples calculating superheat and subcooling using P-T charts - Why accurate refrigerant identification and system pressure stabilization are mandatory for valid diagnostics - Common NATE trick questions regarding subcooled or superheated states and the PLST mental shortcut For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep