HVAC Final Exam Electrical For Air Conditioning Questions & Answers Accurate 100%

When using a low voltage T-stat for heating and cooling, when would there be a jumper between Rh and Rc? Select one: a. When using a single transformer system b. When heating with an oil boiler c. When heating with a gas boiler d. When using a two transformer system - ANSWER A) When Using a single transformer system Digital thermostats usually display temperature, time of day, programming and operating status. Select one: True False - ANSWER True With the fan switch in the on position, the indoor fan will,,, Select one: a. Run in cooling mode b. run continuously c. run only when the outdoor unit runs d. none of the above - ANSWER b. run continuously What is the most common type of T-sat in the HVAC industry? Select one: a. Line voltage b. Remote bulb c. Low voltage d. None of the above - ANSWER c. Low voltage What device is added to a oil or gas forced hot air system when it is not AC ready? Select one: a. Fan limit switch b. Fan Center c. Multi Stage Thermostat d. Mars Relay - ANSWER b. Fan Center When a technician is taking an ohm reading across an open switch what should the reading be? Select one: a. 0 b. OL c. Source Voltage d. Some Number - ANSWER b. OL What does the "Y" terminal connect to on a wall mounted low voltage T-stat? Select one: a. Outdoor fan relay b. Cooling Contactor c. Primary side of transformer d. Indoor fan relay - ANSWER b. Cooling Contactor In a transformer the ______________________ winding is the windings to which voltage is supplied and is considered the load side of the transformer. Select one: a. primary b. secondary c. start d. run - ANSWER a. primary What would be the cause of a transformer failure? Select one: a. Compressor amps too high for circuit b. Overloading the control circuit c. Underloading the control circuit d. None of the above - ANSWER b. Overloading the control circuit What does the "G" terminal control on a low voltage wall mounted T-sat? Select one: a. Outdoor fan Relay b. Cooling Relay c. Indoor fan Relay d. Heat Relay - ANSWER c. Indoor fan Relay Contactors are rated according to the maximum amperage through the; Select one: a. coil b. contacts c. thermostat d. fuse - ANSWER b. contacts A cooling thermostat ___________________________. Select one: a. opens on temp. rise b. closes on temp. rise - ANSWER b. closes on temp. rise When ohming out a load what reading should the technician get? Select one: a. 0 b. OL c. Some Number d. Source Voltage - ANSWER c. Some Number When a technician is taking a volt reading across a closed switch in an energized circuit what should the reading be? Select one: a. 0 b. OL c. Source Voltage d. Infinity - ANSWER a. 0 When a technician is taking a volt reading across an open switch in an energized circuit what should the reading be? S Digital thermostats usually display temperature, time of day, programming and operating status. Select one: True False - ANSWER True