NATE CORE QUESTIONS WITH ANSWERS VERIFIED CORRECT

Honest Person - Is free from fraud and deception, is credible, is marked with integrity, and is fair in their dealings with others Legally binding agree - Must always be in writing Department of Transportation - Responsible for the shipping and labeling of all refrigerants Dry Bulb Temperature - Customers most often describe their comfort in terms of Relative humidity - A sling psychrometer Measures dry bulb and wet bulb temperatures which are then used to determine Refrigerant vapors in high concentration can cause - Heart irregularities and unconciousness Slate roofs are high risk of ... and should be avoided - Slipping and falling Bypass humidifier damper should be - Open in the winter Induction run motors is a - Start capacitor in series with the start winding connected by a potential relay in parallel with the start winding Capacitor run motors use a - Start capacitor in series with the start winding connected by a potential relay in parallel with the start winding and a permanent run capacitor connected across both start and run windings permanent split capacitor - Use one capacitor installed permanently across both start and run windings Motors above 5hp used on a belt drive fans are typically - 240/460 volts 3 phase Motors can have - 2 4 6 or 8 poles Fewer poles = - Faster rpms More poles = - Slower rpms Properly loaded motors run at about - 95percent synchronous speed called slip speed 2 poles = - 3600 rpm 4 poles = - 1800 rpm 6poles = - 1200 rpm 8 poles = - 900 rpm Pictorial wiring diagrams generally show - Components in their approximate positions in the equipment Maximum safe temperature to store r410a is - 125 degrees f Analog VOM - Meter that displays volts ohms or Millard's on an analog scale A voltmeter is connected - In parallel An ohmmeter is connected - In series An ammeter - Is in series with the conductor A continuity check - Show continuity by reading zero ohms or some specific reading A spirit level - Can check both for level and plumb A tool used to cut threads on a shaft is called - A die A tool used to cut threads in a hole is called a - A tap Voltage - Is electrical pressure Current flow must have - A power source, path, and load Ohms law - E=IxR Inductive electricity is - Anything that moves, motors, solenoid Resistive electricity is - A heater coil Transformers are rated in - Volt amps Dc current flows - In one direction Voltage from a batter can be compared to - Pressure from a water pump How many amps is a 24 volt 40 a transformer rated for - 1.666 Motors are grounded - To take away voltage potential Low voltage wiring is - Color coded To change the rotation of a three phase motor - Reverse any two terminals Power is measured in - Watts Volt meters read - Potential difference Volt meters leads are placed - Parallel across the load Changing fan speeds will - Change cfms on a properly loaded motor When checking winding on an energized compressor your meter will be set in - Volts