HVAC EXCELLENCE ACTUAL FINAL EXAM QUESTIONS COMPLETE WITH VERIFIED ANSWERS|

HVAC EXCELLENCE ACTUAL FINAL EXAM QUESTIONS COMPLETE WITH VERIFIED ANSWERS| Q.Before working on an electric furnace the tech should - ANSWERS-Review diagram, remove jewelry, and follow safety procedures. ALL OF THE ABOVE. Q.A GFCI circuit breaker - ANSWERS-detects current leaks to groound Q.the conductor in an electric heat element is usually made of - ANSWERS-Nichrome Q.An example of resistive load is - ANSWERS-crankcase heater Q.an example of an inductive load is - ANSWERS-motor Q.an electric furnace is marked 208/230 single phase 60Hz A tech reads 200 vac at the power supply and determines - ANSWERS-the voltage is too low Q.voltage imbalance between any leg of 3 phase power supply may not exceed - ANSWERS-2% Q.the limit switch on an electric furnace is a - ANSWERS-Automatic reset switch Q.the sequencer timers on electric heater will usually energize the 1st heating element after a time delay of - ANSWERS-1 to 30 sec Q.the amount of btus produced by 1 watt of electricity is - ANSWERS-3.413 btus Q.a tech reads 60 amps with a clamp on amp meter on a forced air furnace. the supply voltage is 230 volts AC, approx how many watts is the furnace using - ANSWERS-13,800 Q.a furnace is using 15,500 watts approx Kw - ANSWERS-15.5 Kw Q.a sequencer timer use _____ to close the contact points to the heater element - ANSWERS-heated snap-discs or bi-metal strips Q.an electric furnace heating thermostat must - ANSWERS-open on rise close on drop Q.a standard thermostat heat anticipator is ____ and wired in ____ with the heating control - ANSWERS-adjustable/series Q.some thermostat manufacturers require a jumper connection on the thermostat subbase of heating and cooling thermostat in order to - ANSWERS-use a single transformer Q.most electric heat elements use the following safties to prevent overheating - ANSWERS-snap disc and fusible link Q.a tech reads 70 amps to the single phase heater . the supply voltage is 230 volts Ac. Approx how many btus is the furnace producing - ANSWERS-54,949 Q.the control that prevents duct heater from operating unless there is adequate supply air is - ANSWERS-fan interlock Q.the COP for electric resistance heat is - ANSWERS-1 to 1 Q.what is the maximum kW element used on each contact of a residential heat sequencer - ANSWERS-5 kW Q.electric heaters are generally rated at ____ volts ac for kW output - ANSWERS-240 Q.the first stage of a sequencer usually has a set of contacts to - ANSWERS-start the blower fan motor Q.an automatic reset safety on a heater element generally opens at ____*F - ANSWERS-130-190*F Q.most heating elements are mounted on which type of insulator - ANSWERS-mica or ceramic Q.a 10 kW electric heater operating at 240 v draws 42 amps, what will a 10 kW heater wired to 480 volts draw - ANSWERS-21 amps Q.the purpose of a sequencer is to - ANSWERS-avoid a sudden power load Q.two major factors in determining the temp rise of an electric furnace are - ANSWERS-furnace KW and CFM Q.a major cause of electrical heat element burn out - ANSWERS-low airflow Q.a tech is checking the resistance on delta wired 3 phase 240 v 15 kW electic duct heater if one element is open he would read - ANSWERS-L1 to L2 22Ohm L1 to L3 22ohm L2 to L3 infinity