Electric heat (Exam Review Questions and Answers )_Make sure electric power at the furnace is turned off - CORRECT ANSWER-What is the first thing a technician should do before working on a funace?

Electric heat (Exam Review Questions and Answers )_Make sure electric power at the furnace is turned off - CORRECT ANSWER-What is the first thing a technician should do before working on a funace? Current leaks to ground - CORRECT ANSWER-A GFCI detects what? Nichrome - CORRECT ANSWER-The conductor in an electric heat element is usually made of? A crankcase heater - CORRECT ANSWER-An example of a resistive heater is? Motor - CORRECT ANSWER-An example of a inductive load is a? The voltage is within allowable limits - CORRECT ANSWER-An electric furnace is marked 208/230- single phase-60 Hz. 200 VAC at the power supply and determines? 2% - CORRECT ANSWER-Voltage between any legs of 3- phase power supply may not exceed what percentage of voltage? Automatic reset switch - CORRECT ANSWER-The limit switch on an electric furnace is a? 1 to 30 seconds - CORRECT ANSWER-The sequencer timers on electric heaters will usually energize the 1st heating element after a time delay of? 3.413 BTU's - CORRECT ANSWER-The amount of BTU's produced by one watt of electricity is? 13,800 - CORRECT ANSWER-A technician reads 60 amps with a clamp-on ammeter on a forced air furnace. The supply voltage is 230 volts AC. Approximately how many watts is the furnace using? 15.5kw - CORRECT ANSWER-A furnace is using 15,500 watts of power. What is the approximate kW rating? heated snap-discs or heated bi-metal strips - CORRECT ANSWER-Sequence timers use what to close contact points to the heater element? Temperature - CORRECT ANSWER-An electric furnace heating thermostat must must open and close on the rise of? Series and adjustable - CORRECT ANSWER-A standard thermostat heat anticipatory is wired in what and can be what? Single transformer - CORRECT ANSWER-Some thermostat manufacturers require a "jumper" connection on the thermostat sub-base of heating and cooling thermostats in order to use a? Snap disc and fusible link - CORRECT ANSWER-Most electric heat elements use what kind of safeties to prevent overheating?