NATE Core Exam 50 Questions and Correct Solutions Graded A+.

What type of wrench has a wheel mechanism that allows a jaw to open and close? - Answer: Adjustable wrench What should a claw hammer be used for? - Answer: Carpentry work or removing nails What is a reamer blade used for? - Answer: Removing burrs from the inside of tubing What type of pliers have sharp side cutters that allow flash cuts on electrical wire? - Answer: Lineman's What type of tools use for cutting sheet metal? - Answer: Aviation snips As air temperature increases in the home, the air density? - Answer: Decreases If the pressure exerted upon a liquid is reduced, what effect does this have on the liquids boiling point temperature? - Answer: It lowers the boiling point Which of the following materials is a good conductor? - Answer: Copper What is electrical resistance measured in? - Answer: Ohms (Ω) which of the following is represented by thick solid line on an HVAC unit wiring diagram? - Answer: Factory high-voltage wiring Which of the following is most useful for troubleshooting by service technician? - Answer: The schematic diagram Which is the device represented by the following symbol? - Answer: A two pole contactor What device is represented by the following symbol? - Answer: Cooling thermostat Which of the following is the most correct definition of the switch placement in a schematic drawing? - Answer: Switches are in series with the Load Which of the following motor types would have both a starter capacitor any run capacitor? - Answer: CSCR Which of the following can cause noise complaints? - Answer: High air velocity What does the term infiltration refer to? - Answer: Outdoor air entering the home Which of the following temperatures and relative humidity levels do most people find comfortable? - Answer: 70-75°F and 25-35% humidity Which of the following can be used to control orders? - Answer: Charcoal filters What is the primary purpose of bringing in outdoor air into an HVAC system? - Answer: To provide fresh air to a condition space What type of heat is transfer Is most common in residential heating and air conditioning systems? - Answer: Convection What is represented on the bottom line of a Psychrometric chart? - Answer: Dry bulb temperature What is represented in the curved line in the center area of the psychometric chart? - Answer: Humidity Which of the following can be used to control orders? - Answer: Charcoal filters What is meant by a D:S ratio of 10:1 on an infrared thermometer? - Answer: From 10 feet away, the meter averages in area of 1 foot in diameter What is the ratio used by the architect or plan designer to describe the relationship of actual measurements to the representational Measurement that is used called? - Answer: Scale What is the passageway that accommodates pipes or ducts? - Answer: Chase