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Exam 23: Electric Heat

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Question 1

True/False

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Electric furnaces require a special room thermostat to control the temperature.

A) True
B) False

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Question 2

Multiple Choice

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The single most important feature on electric furnaces is a/an __________ that exists between the blower motor and the electric heating elements.

A) sequencer
B) fuse
C) high limit
D) interlock

E) B) and C)
F) None of the above

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Question 3

True/False

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The indoor fan must energize as soon as the electric heating elements are energized.

The wire used in electric heating elements has a low resistance to current flow.

List two methods for proving airflow on an electric furnace.

Electric heat may, in many cases, be expensive, but it is 100% efficient.

One kilowatt will produce __________ Btus of heat energy.

If the thermostat is calling for heat, __________ volts should be read between R and W on the thermostat terminal strip.

A 5-kW electric heating element will generate __________ Btus of heat.

On a call for heat on an electric furnace, __________ volts should be read between R and Y on the thermostat terminal strip.

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?

Residential electric furnaces require which type of power supply?

Which device will open first if a high temperature condition exists on an electric furnace?

Electric heating elements are rated in __________.

On a call for heat on an electric furnace, __________ volts should be read between W and G on the thermostat terminal strip.

Electric duct heaters can only be used with heat pump systems.

When troubleshooting an electric furnace, you find that the blower is operating, but cold air is coming out of the ducts, the thermostat is calling for heat, and the fan setting is on auto. What would be the most likely problem?

Electric, resistive-type heating is by far the most efficient of all types of heating.

Electric furnaces have an efficiency of __________%.

What would be the electric heat requirement for a house with a 50,000 Btu heat loss? (Please show your work.)