NATE CORE QUESTIONS WITH ANSWERS VERIFIED CORRECT

What method of heat transfer does not require fluids or solids? - Radiation (heat waves) Capillary tubing should only be cut to length using a - triangular knife edge file Before beginning any electrical checkout procedure, what step must always be taken after the equipment disconnect or circuit breaker has been turned off? - When making a flare, the height of the tubing above the flaring block is critical because a flare with too much starting height will - not fit into the flare nut Dew point is - temperature in which water vapor condense the temperature most often used by customers when discussing human comfort is - Dry Bulb Which meter should a technician use to determine whether or not a set of contacts are open in an energized circuit? - Volt meter Pictorial wiring diagrams generally show components - in their approximate positions in the equipment A ladder schematic is useful for - troubleshooting a unit A digital electrical multimeter marked "autoranging" will automatically set itself for - Reading voltage and range when connected to a voltage source 24v transformer with 5:1 turns ratio, Primary voltage 120v In the event of a 4% primary voltage drop, what will be the secondary voltage? Np/Ns=Ep/Es. - answer: 23.04 24 x 5 = 120 5:1 turn ratio 120 x .04 = 4.8 4% voltage drop 120- 4.8 = 115.2 new primary voltage 115.2 /5= 23.04 new secondary voltage To properly test the accuracy of a thermometer, it should be immersed in - Ice water bath What is typically represented by the 2 lines on the side of a ladder diagram - Each leg of line voltage only Lever type tubing ae best used for - Soft drawn copper tubing The heat that causes a thermometer reading to change is called - Sensible heat Material that is used over roof beams or rafters as a base for the roofing is called - Sheathing Construction fall protection is required wherever working over the minimum height of - 6 feet What is an example of a wet bulb thermometer - A conventional thermometer with a moistened wick covering its sensor A technician working around operating blower should - Wear tight fitting clothes, remove jewelry, and secure long hair with a cap or net What is a ground fault circuit interrupter (GFCI) receptacle? - A receptacle that is used to protect against electrical shocks from appliances and extension cords The tool specifically made to thread a hole in metal is a - Tap What device does the above electrical symbol represent. - Open on rise temp control