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WorksheetsACR-205 Homework week 2
Total questions: 11
Worksheet time: 7mins
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 (a) .
In order to provide time delay between stages of electric heat, the controls that are used are called
(a)
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
How is the formula QS = 1.08 × cfm × TD often called?
sensible heat formula
latent heat formula
sensible flow formula
latent flow formula
