ACR-205 Homework week 2

The limit switch is used on the electric element assembly to ____.

• shuts off the unit if high temperature occurs

• start the unit if the thermostat malfunctions

• ensure that the fan stops when the unit cools down

• start the unit prematurely on a cold day

Which of the following elements is not a power-consuming device?

• The contacts of a contactor.

• The sequencer heater coil.

• A magnetic solenoid that moves the armature in a contactor

• The blower motor.

A 10 Kw heating element, operating on rated 240 V, will generate ____ Btu/h.

• 34,130

• 29,319

• 31,062

• 35,875

Electric heating units provide almost instant heat. Therefore, anticipators are not needed in electric heat thermostats.

• false

• true

If the number two contact on a package sequencer fails to close, the number three contact can still close.

• true

• false

All electric furnaces use package sequencers.

• false

• true

If the fan were to fail and the limit switch stuck closed, the element would be cut off by the ____________________.

In order to provide time delay between stages of electric heat, the controls that are used are called

For each watt of electrical power, ____________________ Btu/h are generated.

• 3.413

• 34.13

• 341.3

• 3413

Why do most electric furnaces have several heating elements that are activated in stages?

• to avoid high power loads at once

• to avoid low power loads at once

• to make sure it works

• none of the above