Standard furnace controls operate by
A) sending pulses of power down the 24 volt wires B) modulating the voltage to the controlled loads
C) making or breaking circuits to loads D) modulating the current to the controlled loads
C
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The knot shown in the figure above is a _____
a. clove hitch b. half-hitch safety c. square d. bowline
Roof vents must have an area equal to 1/150 of the attic area.
Answer the following statement true (T) or false (F)
The process by which thermal energy is transferred by a vacuum is called __________.
A. convection B. conductance C. radiation
If a condenser is operating with a low saturation temperature and low subcooling, the most likely condition is
A. the condenser is operating with a deficiency of refrigerant B. the condenser is operating with an excessive amount of refrigerant C. there is insufficient airflow through the condenser coil D. there is excessive airflow through the condenser coil