HVAC EXCELLENCE ACTUAL FINAL EXAM | WITH COMPLETE
QUESTIONS AND ANSWERS | 2025/2026 LATEST UPDATED | 100 %
RATED AND VERIFIED SOLUTIONS | GET AN A+
Before working on an electric furnace the tech should - (ANSWER)Review diagram, remove
jewelry, and follow safety procedures. ALL OF THE ABOVE.
A GFCI circuit breaker - (ANSWER)detects current leaks to groound
the conductor in an electric heat element is usually made of - (ANSWER)Nichrome
An example of resistive load is - (ANSWER)crankcase heater
an example of an inductive load is - (ANSWER)motor
an electric furnace is marked 208/230 single phase 60Hz A tech reads 200 vac at the power
supply and determines - (ANSWER)the voltage is too low
voltage imbalance between any leg of 3 phase power supply may not exceed - (ANSWER)2%
,the limit switch on an electric furnace is a - (ANSWER)Automatic reset switch
the sequencer timers on electric heater will usually energize the 1st heating element after a time
delay of - (ANSWER)1 to 30 sec
the amount of btus produced by 1 watt of electricity is - (ANSWER)3.413 btus
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 - (ANSWER)13,800
a furnace is using 15,500 watts approx Kw - (ANSWER)15.5 Kw
a sequencer timer use _____ to close the contact points to the heater element -
(ANSWER)heated snap-discs or bi-metal strips
an electric furnace heating thermostat must - (ANSWER)open on rise close on drop
a standard thermostat heat anticipator is ____ and wired in ____ with the heating control -
(ANSWER)adjustable/series
,some thermostat manufacturers require a jumper connection on the thermostat subbase of heating
and cooling thermostat in order to - (ANSWER)use a single transformer
most electric heat elements use the following safties to prevent overheating - (ANSWER)snap
disc and fusible link
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 - (ANSWER)54,949
the control that prevents duct heater from operating unless there is adequate supply air is -
(ANSWER)fan interlock
the COP for electric resistance heat is - (ANSWER)1 to 1
what is the maximum kW element used on each contact of a residential heat sequencer -
(ANSWER)5 kW
electric heaters are generally rated at ____ volts ac for kW output - (ANSWER)240
, the first stage of a sequencer usually has a set of contacts to - (ANSWER)start the blower fan
motor
an automatic reset safety on a heater element generally opens at ____*F - (ANSWER)130-
190*F
most heating elements are mounted on which type of insulator - (ANSWER)mica or ceramic
a 10 kW electric heater operating at 240 v draws 42 amps, what will a 10 kW heater wired to 480
volts draw - (ANSWER)21 amps
the purpose of a sequencer is to - (ANSWER)avoid a sudden power load
two major factors in determining the temp rise of an electric furnace are - (ANSWER)furnace
KW and CFM
a major cause of electrical heat element burn out - (ANSWER)low airflow
QUESTIONS AND ANSWERS | 2025/2026 LATEST UPDATED | 100 %
RATED AND VERIFIED SOLUTIONS | GET AN A+
Before working on an electric furnace the tech should - (ANSWER)Review diagram, remove
jewelry, and follow safety procedures. ALL OF THE ABOVE.
A GFCI circuit breaker - (ANSWER)detects current leaks to groound
the conductor in an electric heat element is usually made of - (ANSWER)Nichrome
An example of resistive load is - (ANSWER)crankcase heater
an example of an inductive load is - (ANSWER)motor
an electric furnace is marked 208/230 single phase 60Hz A tech reads 200 vac at the power
supply and determines - (ANSWER)the voltage is too low
voltage imbalance between any leg of 3 phase power supply may not exceed - (ANSWER)2%
,the limit switch on an electric furnace is a - (ANSWER)Automatic reset switch
the sequencer timers on electric heater will usually energize the 1st heating element after a time
delay of - (ANSWER)1 to 30 sec
the amount of btus produced by 1 watt of electricity is - (ANSWER)3.413 btus
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 - (ANSWER)13,800
a furnace is using 15,500 watts approx Kw - (ANSWER)15.5 Kw
a sequencer timer use _____ to close the contact points to the heater element -
(ANSWER)heated snap-discs or bi-metal strips
an electric furnace heating thermostat must - (ANSWER)open on rise close on drop
a standard thermostat heat anticipator is ____ and wired in ____ with the heating control -
(ANSWER)adjustable/series
,some thermostat manufacturers require a jumper connection on the thermostat subbase of heating
and cooling thermostat in order to - (ANSWER)use a single transformer
most electric heat elements use the following safties to prevent overheating - (ANSWER)snap
disc and fusible link
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 - (ANSWER)54,949
the control that prevents duct heater from operating unless there is adequate supply air is -
(ANSWER)fan interlock
the COP for electric resistance heat is - (ANSWER)1 to 1
what is the maximum kW element used on each contact of a residential heat sequencer -
(ANSWER)5 kW
electric heaters are generally rated at ____ volts ac for kW output - (ANSWER)240
, the first stage of a sequencer usually has a set of contacts to - (ANSWER)start the blower fan
motor
an automatic reset safety on a heater element generally opens at ____*F - (ANSWER)130-
190*F
most heating elements are mounted on which type of insulator - (ANSWER)mica or ceramic
a 10 kW electric heater operating at 240 v draws 42 amps, what will a 10 kW heater wired to 480
volts draw - (ANSWER)21 amps
the purpose of a sequencer is to - (ANSWER)avoid a sudden power load
two major factors in determining the temp rise of an electric furnace are - (ANSWER)furnace
KW and CFM
a major cause of electrical heat element burn out - (ANSWER)low airflow
