Nate Core Test Questions and Complete Solutions Graded A+

Refrigerant vapors in high concentrations should not be inhaled since they - Answer: 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? - Answer: Pictorial diagram The input side of a step down transformer is also properly called the... - Answer: Primary side The frame of an electric motor is grounded to.... - Answer: Maintain the frame at zero potential A fire extinguisher must have what class rating to extinguish and electrical fire? - Answer: Class C. Combustion is what type of process? - Answer: Chemical. The damper used with a bypass humidifier must be: - Answer: Open in the winter To change the direction of rotation of a fan, driven by a three phase induction motor, it is necessary to: - Answer: Reverse the connections of any two motor leads. What is an accurate formula for Ohm's law? - Answer: R=E/(divided by)I A ceiling which slopes upward from the walls to the center of the room is referred to as: - Answer: Vaulted The primary purpose for bringing outdoor air into a residential air distribution system is to: - Answer: Provide fresh air to a conditioned space How should a technician measure resistance with a digital ohmmeter? - Answer: Disconnect power, electrically isolate the load, connect leads across the load Why is operating sound a consideration in the location of a unit? - Answer: Excessive noise could be disruptive to the customer Why is indoor air cleanliness necessary for comfort? - Answer: Air cleanliness affects health and general well being If one end of a copper tube is heated, the other end will soon become very hot also. The heat moves from one end to the other by: - Answer: Conduction Wet bulb and dry bulb measurements are used to compute: - Answer: Relative humidity How much heat is created by one watt? - Answer: 3.41 btu What type of residential construction uses flooring over a crawl space? - Answer: Pier and beam When working with chemical solvents the technician should review: - Answer: Material safety data sheets When possible, avoid working on slate tile roofs because: - Answer: There is a high risk of slipping and falling on this type of roof. The federal regulatory agency with jurisdiction over the shipping and labeling of pressurized containers is: - Answer: Department of transportation DOT A ladder schematic is useful for - Answer: Troubleshooting a unit A digital electrical multimeter marked "autoranging" will automatically set itself for: - Answer: Range of approximate value when set for either volts, Amps, or ohms The following condition exists: *24V transformer with a 5:1 turns ratio,