WorksheetsElectric Heat
Total questions: 18
Worksheet time: 9mins
Indicate whether the statement is true or false. 2. Electric furnaces require a special room thermostat to control the temperature.
True
False
Indicate whether the statement is true or false. 3. Electric duct heaters can only be used with heat pump systems.
True
False
Indicate whether the statement is true or false. 4. The wire used in electric heating elements has a low resistance to current flow.
True
False
Indicate whether the statement is true or false. 5. Electric heat may, in many cases, be expensive, but it is 100% efficient.
True
False
One kilowatt will produce __________ Btus of heat energy.
4133
3413
1334
3134
The single most important feature on electric furnaces is a/an __________ that exists between the blower motor and the electric heating elements.
sequencer
fuse
high limit
interlock
Which device will open first if a high temperature condition exists on an electric furnace?
fusible link
limit switch
high-pressure control
interlock
When troubleshooting an electric furnace, you find that the fusible link on the first heating element is melted. What would be the most likely problem?
defective heating element
tripped circuit breaker
defective fan motor
defective fusible link
Which of the following is typically used as an interlock in an electric furnace?
sequencer
limit switch
fusible link
sail switch
What would be the electric heat requirement for a house with a 65,000 Btu heat loss? (Please show your work.)
19.05 Kw (65,000 Btu / 3,413 Btu per kW)
12.50 Kw (65,000 Btu / 5,200 Btu per kW)
25.00 Kw (65,000 Btu / 2,600 Btu per kW)
30.00 Kw (65,000 Btu / 2,167 Btu per kW)
Which of the following is a common safety device used to prevent overheating in electric furnaces?
relay
pressure switch
thermocouple
limit switch
Indicate whether the statement is true or false.
Electric furnaces can be used as a primary heating source in residential buildings.
True
False
What is the main function of a sequencer in an electric furnace?
to control the order in which heating elements are energized
to regulate the room temperature
to measure airflow
to protect against electrical surges
Which material is commonly used for the wire in electric heating elements due to its high resistance?
Silver
Nickel-chromium alloy
Copper
Aluminum
Indicate whether the statement is true or false.
Electric furnaces typically require less maintenance than gas furnaces.
True
False
What is the primary purpose of a high limit switch in an electric furnace?
To measure humidity
To regulate voltage
To prevent overheating
To control fan speed
Which of the following components helps prevent simultaneous energizing of all heating elements in an electric furnace?
limit switch
sequencer
thermostat
relay
What is the likely consequence if the blower motor in an electric furnace fails to operate?
Heating elements will overheat
Room temperature will decrease rapidly
Thermostat will stop working
Fusible link will be bypassed
