Download NATE Exam: Core Test Refresher Questions and Answers and more Exams Nursing in PDF only on Docsity! NATE Exam: Core Test Refresher Questions and Answers (Graded A) 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 - ANSWER-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 - ANSWER-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 - ANSWER-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 - ANSWER-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 - ANSWER-a (Supply air pressure) When the external static pressure rises, the delivered air volume will: Heat transfers from a warm object to a cold object in three ways, convection, conduction, or reduction. a. True b. False - ANSWER-b (False) BTU stands for . a. British Temperature Unit b. Basic Temperature Unit c. British Thermal Unit - ANSWER-c (British Thermal Unit) For every BTU of heat, 1 pound of water will change temperature by 1F. a. True b. False - ANSWER-a (True) The two types of heat that air contains are . a. surface and latent heat b. sensible and latent heat c. sensible and dry heat - ANSWER-b (sensible and latent heat) The temperature at which air reaches the saturation temperature is dew point. a. True b. False - ANSWER-a (True) The combination of latent and sensible heat in the air is called Total Heat or . a. Entropy b. Ethnology c. Enthalopy d. Enthalpy - ANSWER-d (Enthalpy) On a Psychrometric chart, the temperature is listed at the bottom of the chart. a. wet bulb b. latent c. dry bulb d. dew point - ANSWER-c (dry bulb) The formula for Ohms Law is: a. E = I x R b. E = T x R c. E = P x I d. E = P x R - ANSWER-a (E = I x R) a. True b. False - ANSWER-b (False) A capacitor and start winding used in a split phase capacitor start motor are removed from the circuit once the motor comes up to about 75% of running speed. a. True b. False - ANSWER-a (True) A PSC motor leaves the start winding in the electrical circuit during run operation. a. True b. False - ANSWER-a (True) Shaded pole motors are stronger than split phase motors. a. True b. False - ANSWER-b (False) Shaded pole motors have only one winding. a. True b. False - ANSWER-a (True) Three phase motors are stronger than PSC motors. a. True b. False - ANSWER-a (True?) To change the rotational direction of a three phase motor, two incoming power legs are reversed. a. True b. False - ANSWER-a (True) A motor with 2 poles operating at 60 HZ will have an RPM of . a. 120 RF b. 1,800 RF c. 3,600 RF d. 7,200 RF - ANSWER-c (3,600 RF) When a blower wheel comes up to speed, the current draw of the blower motor will . a. Rise b. Fall c. Not change - ANSWER-b (Fall) It is recommended that most motors operate within the Service Factor for best reliability. a. True b. False - ANSWER-b (False) Air volume delivered by a blower assembly can be increased by increasing motor horsepower. a. True b. False - ANSWER-b (False) Thermisters are tested with a: a. Tachometer b. Voltmeter c. Amp meter d. Ohm meter - ANSWER-d (Ohm meter) Thermisters can have negative or positive coefficients. a. True b. False - ANSWER-a (True) A diode will conduct current in only 1 direction. a. True b. False - ANSWER-a (True) A Triac can conduct current in both directions. a. True b. False - ANSWER-a (True) A Silicon Controlled Rectifier (SCR) is a slow switch that can handle high current. a. True b. False - ANSWER-b (False) A potential relay is a normally open relay. a. True
