ELECTRIC HEATING CERTIFICATION
EXAM CORRECT 100%
Before working on an electric furnace, the technician should? - ANSWER Remove
jewelry and watches
Review wiring diagram
Safety goggles or glasses all safety procedures
A GFCI circuit breaker: - ANSWER detects current leaks to groound
The conductor in an electric heat element is usually made of; - ANSWER nichrome
An a example of a a resistive load is a - ANSWER crankcase heater
An example of a inductive load is a: - ANSWER motor
An electric furnace is marked 208/230- single phase 60 hz. a technican reads 200 vac
at the power supply and determines. - ANSWER the voltage is too low
Voltage imbalance between any legs of a 3-phase power supply may not exceed: -
ANSWER 2%
The limit switch on an electric furnace should be: - ANSWER automatic reset switch
The sequencer timers on electric heaters will usually energize the 1st heating element
after a time delay of; - ANSWER 1-30 seconds
The amount of BTUs produced by one watt of electricity is: - ANSWER 3.413 BTUs
A technican 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 furnance using? -
ANSWER 13,800
A furnace is using 15,500 watts of power.What is the approximate kW rating? -
ANSWER 15.5 kw
Sequence timers use _______ to cose the contact points to the heater element. -
ANSWER heated snap-discs or heated bi-metal strip
An electric furnace heating thermostat must; - ANSWER open on a rise/close on a drop
A standard thermostat heat anticipator is ____ and wired in____ with the heating contol.
- ANSWER adjustable/series
, Some thermostat manufacturers require a " jumper" connection on the thermostat sub-
base of heating and cooling thermostats in order to: - ANSWER use a single
transformer
Most electric heating elements use the following safeties to prevent overheating. -
ANSWER snap disc and fusible link
The purpose of a sequencer is to: - ANSWER avoid a sudden power load
Two major factors in determining the temperature rise of an electric furnace are: -
ANSWER furnace kw and CFM
A major cause of electrical heat element burn out is: - ANSWER low airflow
A technician is checking the resistance on a delta wired three-phase 240 volt 15 kW
electric duct heater. If one element is open, he would read: - ANSWER L1 toL2 =22ohm
L1 to L3 = 22 ohms
L2 to L3 = infinity ohms
The purpose of setting a heat anticipator properly is to: - ANSWER control cycling time
A 10 kw heater installed in a 2 ton central air conditioning and heating furnace should
have an air flow of ____CFM. - ANSWER 300-500
Resistance to air flow (StaticPressure) in an electric heater is measured in: - ANSWER
inches of water column
To properly set a heat anticipator,the technican should measure the amps between
terminals and____on the theromstat sub-base. - ANSWER R-W
A technician is installing a 3-ton cooling system with a 15kw electric furnace. The
thermostat would require wiring with a minimum of ____ conductors. - ANSWER 4
A 1/3HP single-phase PSC electric blower motor would draw approxmately____at 240
volts AC. - ANSWER 2-4 amps
On a Delta wired heater a technician reads L1 to L2 -11 ohm. L1 to L3-22 ohms and L2
to L3-11ohms. - ANSWER the element between L1 and L3 is shorted
A 1200 CFM furnace operating with a 10kw heater at 240 volt AC would have a
temperature rise of _______F. - ANSWER 20-30
A technican is checking the output of a 5 kw supplemental heater used with a
heatpump. The heating element is controlled by what stage of the thermostat? -
ANSWER auxiliary heating
EXAM CORRECT 100%
Before working on an electric furnace, the technician should? - ANSWER Remove
jewelry and watches
Review wiring diagram
Safety goggles or glasses all safety procedures
A GFCI circuit breaker: - ANSWER detects current leaks to groound
The conductor in an electric heat element is usually made of; - ANSWER nichrome
An a example of a a resistive load is a - ANSWER crankcase heater
An example of a inductive load is a: - ANSWER motor
An electric furnace is marked 208/230- single phase 60 hz. a technican reads 200 vac
at the power supply and determines. - ANSWER the voltage is too low
Voltage imbalance between any legs of a 3-phase power supply may not exceed: -
ANSWER 2%
The limit switch on an electric furnace should be: - ANSWER automatic reset switch
The sequencer timers on electric heaters will usually energize the 1st heating element
after a time delay of; - ANSWER 1-30 seconds
The amount of BTUs produced by one watt of electricity is: - ANSWER 3.413 BTUs
A technican 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 furnance using? -
ANSWER 13,800
A furnace is using 15,500 watts of power.What is the approximate kW rating? -
ANSWER 15.5 kw
Sequence timers use _______ to cose the contact points to the heater element. -
ANSWER heated snap-discs or heated bi-metal strip
An electric furnace heating thermostat must; - ANSWER open on a rise/close on a drop
A standard thermostat heat anticipator is ____ and wired in____ with the heating contol.
- ANSWER adjustable/series
, Some thermostat manufacturers require a " jumper" connection on the thermostat sub-
base of heating and cooling thermostats in order to: - ANSWER use a single
transformer
Most electric heating elements use the following safeties to prevent overheating. -
ANSWER snap disc and fusible link
The purpose of a sequencer is to: - ANSWER avoid a sudden power load
Two major factors in determining the temperature rise of an electric furnace are: -
ANSWER furnace kw and CFM
A major cause of electrical heat element burn out is: - ANSWER low airflow
A technician is checking the resistance on a delta wired three-phase 240 volt 15 kW
electric duct heater. If one element is open, he would read: - ANSWER L1 toL2 =22ohm
L1 to L3 = 22 ohms
L2 to L3 = infinity ohms
The purpose of setting a heat anticipator properly is to: - ANSWER control cycling time
A 10 kw heater installed in a 2 ton central air conditioning and heating furnace should
have an air flow of ____CFM. - ANSWER 300-500
Resistance to air flow (StaticPressure) in an electric heater is measured in: - ANSWER
inches of water column
To properly set a heat anticipator,the technican should measure the amps between
terminals and____on the theromstat sub-base. - ANSWER R-W
A technician is installing a 3-ton cooling system with a 15kw electric furnace. The
thermostat would require wiring with a minimum of ____ conductors. - ANSWER 4
A 1/3HP single-phase PSC electric blower motor would draw approxmately____at 240
volts AC. - ANSWER 2-4 amps
On a Delta wired heater a technician reads L1 to L2 -11 ohm. L1 to L3-22 ohms and L2
to L3-11ohms. - ANSWER the element between L1 and L3 is shorted
A 1200 CFM furnace operating with a 10kw heater at 240 volt AC would have a
temperature rise of _______F. - ANSWER 20-30
A technican is checking the output of a 5 kw supplemental heater used with a
heatpump. The heating element is controlled by what stage of the thermostat? -
ANSWER auxiliary heating
