Why do air source heat pump thermostats have two stages of heat?
What will be an ideal response?
A two stage thermostat is required for the heating operation. The first stage of heat energizes the refrigeration circuit of the heat pump: the compressor and both indoor and outdoor fan motors. The second stage energizes the auxiliary heat when the heat pump cannot maintain the temperature on its own.
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Filling spokes or vanes with section lines gives an immediate but false impression that the object is ____ throughout the spoke or vane area.
A. hollow B. less dense C. solid D. unfinished
Match the signal person's hand signal with the desired crane operator action.
1) _____ Arm extended, thumb pointing down, and flexing the fingers in and out. 2) _____ Both arms extended, palms down, arms moving rapidly back and forth horizontally. 3) _____ Arm extended, fingers closed, thumb pointing downward. 4) _____ Forearm vertical, forefinger pointing up, and hand moving in a small horizontal circle. 5) _____ Tapping the elbow with one hand. A. Lower the boom B. Lower the boom and raise the load C. Raise the load D. Emergency stop E. Use the whip line F. Extend the boom
All automatic transmissions use some sort of planetary gear set.
Answer the following statement true (T) or false (F)
Find the capacitor voltage for t < 0 and t > 0 for each of the circuits in Fig. 7.107.
 FIGURE 1.png)