Nate Core Exam Study Guide- Questions with Answers

What are the five basic components to any schematic? 1. A power supply 2. A path for the power 3. A load or component that operates from the power. 4. A switch or component that interrupts the power to the load. 5. A legend or key that explains what the various symbols and abbreviations used in the schematic mean. What are the three basic types of wiring diagrams used in the HVACR trade? 1. The ladder diagram 2. The pictorial diagram 3. The installation diagram Describe the characteristics of a ladder diagram 1. Provides the most helpful information for electrical troubleshooting 2.The intention of the overall schematic is to show how the circuit functions not how it actually looks. Describe the characteristics of a pictorial diagram 1. Usually includes drawings that more closely resemble the components themselves rather than the symbols. 2. Provides the best indication of the actual positions of the components in the equipment or control panel. Describe the characteristics of an installation diagram 1. Used primarily By the person installing equipment 2. It normally only shows what the terminal board connections are and may or may not include any internal wiring of the unit 3. Field wiring Generally represented as Dashed lines. 4. Thicker lines represent line voltage wiring(120/240 V) 5. Thin lines represent low-voltage control wiring What is a switch? A switch is a device that interrupts power to the load. It may be manually or automatically activated by pressure, temperature or it may be an electrically controlled switch What is a load? A load is a device that consumes power and converts it into some other form of energy Describe the side-by-side arrangement four wire diagrams Usually arranges motors and other power consuming components on the right side of the diagram called the "load" side. The switches and other controllers are placed on the left side of the diagram called the "line"side. Describe the up and down schematic arrangement This type of arrangement divides the schematic in to high-voltage and low-voltage sections. Normally the high voltage section is placed on the top and the low voltage is placed on the bottom of the diagram.