NATE Core Examination Questions with Correct Answers

Refrigerant vapors in high concentrations should not be inhaled since they May cause heart irregularites or unconsciousness What diagrams would you use to find the physical location of the low voltage connection terminals in the unit? Pictorial diagram The input side of a step down transformer is also properly called the... Primary side The frame of an electric motor is grounded to.... Maintain the frame at zero potential A fire extinguisher must have what class rating to extinguish and electrical fire? Class C. Combustion is what type of process? Chemical. The damper used with a bypass humidifier must be: Open in the winter To change the direction of rotation of a fan, driven by a three phase induction motor, it is necessary to: Reverse the connections of any two motor leads. What is an accurate formula for Ohm's law? R=E/(divided by)I A ceiling which slopes upward from the walls to the center of the room is referred to as: Vaulted The primary purpose for bringing outdoor air into a residential air distribution system is to: Provide fresh air to a conditioned space How should a technician measure resistance with a digital ohmmeter? Disconnect power, electrically isolate the load, connect leads across the load Why is operating sound a consideration in the location of a unit? Excessive noise could be disruptive to the customer Why is indoor air cleanliness necessary for comfort? Air cleanliness affects health and general well being