Nate Core Exam 2023 Questions And Answers

Nate Core Exam 2023 Questions and Answers1kwh of electric power is equivalent to ___ btu per hour.A. 3142B. 6412C. 9412D. 6812 - ANSWER-AGas valves operate at ____ voltage.A. 120vB. 230vC. 24vD. 12v - ANSWER-CWhat will be the resistance in the circuit if the supply voltage is 30v and current flowing through the circuit is 5A.A. 3 ohmsB. 1/3 ohmsC. 1/6 ohmsD. 6 ohms - ANSWER-DFurnaces are placed into categories based upon.A. Venting characteristicsB. Btuh capacity rangeC. Total airflow in CFMD. Gas valve type - ANSWER-AAn oil separator is located in the____A. Expansion lineB. Liquid lineC. Suction lineD. Discharge line - ANSWER-DPropane and butane are ____ than air.A. Same weightB. HeavierC. Lighter - ANSWER-BCurrent in a closed circuit is limited by which of the following?A. HeatB. VoltageC. TemperatureD. Resistance - ANSWER-D_____ use two special helical rotors that introduce suction vapors then compress them.A. All options are correctB. Scroll compressorsC. Reciprocating compressorsD. Screw compressors - ANSWER-DA high pressure steam boiler operates at a pressure greater than ____A. 5 psigB. 15 psigC. 25 psigD 20 psig - ANSWER-B____ is the heat that is absorbed or extracted when a substance changes its state.A. EnthalpyB. EntropyC. Latent heatD. Specific heat - ANSWER-CSight glass is present