How is an outdoor thermostat used in a dual-fuel heat pump system?
A) The outdoor thermostat prevents the heat pump from operating above the balance point.
B) The outdoor thermostat prevents the heat pump from defrosting above the balance point.
C) The outdoor thermostat prevents the electric strip heat from operating above the balance point.
D) The outdoor thermostat prevents the furnace from operating above the balance point.
D
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Compressing a vapor ___________
A) Increases the pressure and decreases the temperature. B) Increases the pressure and increases the temperature. C) Decreases the pressure and decreases the temperature. D) Decreases the pressure and increases the temperature.
In refrigeration and air conditioning, switches are normally wired:
A) In either series or parallel with the load they control. B) In series with the load they control. C) In parallel with the load they control. D) In parallel with the power supply.
When a DS-3 is optioned for ________, there is no framing format attached
A) clear channel B) M13 C) M23 D) C-bit parity
When a valve is selected that is sized too large, the controller of the closed-loop system will cause it to operate at or near the ____ position.
A. open B. closed