NATE Exam: Core Test Refresher Questions with Answers

Calculate the air volume based upon these conditions: 90,000 BTUH output Return air temperature: 70F Supply air temperature: 110F a. 1,158 CFM b. 1,500 CFM c. 1,800 CFM d. 2,083 CFM d (2,083 CFM) When measuring CFM using temperature rise method, the furnace blower motor speed should be in: a. Continuous fan speed b. Cool mode speed c. Heat mode speed b (Cool mode speed) If a single phase electric heat section is supplied with 225 volts and is drawing 45 AMPS, the BTUH output of the heat section is: a. 34,500 BTUH b. 25,000 BTUH c. 45,000 BTUH a (34,500 BTUH) When measuring temperature rise, take the supply air temperature directly in line with the heater section of the air handler: a. True b. False b (False) When measuring external static pressure, the high port of the pressure gauge should be placed in the duct system to sense: a. Supply air pressure b. Return air pressure a (Supply air pressure) When the external static pressure rises, the delivered air volume will: a. Increase b. Decrease b (Decrease) When measuring external static pressure on a gas furnace that utilizes an evaporator coil, the supply air static pressure should be taken at: a. The inlet to the evaporator b. The outlet of the evaporator a (The inlet to the evaporator) The pressure gauge used to sense external static pressure in a residential duct system should have a pressure range scale of: a. 0-1" water column b. 0-5" water column c. 0-10" water column a (0-1" water column) If the velocity air in a 20 by 10 inch duct is 750 FPM, the air being delivered by the duct is: a. 1,209 CFM b. 750 CFM c. 1,042 CFM d. 825 CFM c (1,042 CFM) Taking average readings of air velocity in the cross sectional area of a duct is called: a. Traversing b. Averaging c. Estimating a (Traversing)