Vapor is more dense than liquid and, as the liquid refrigerant boils, it has a tendency to sink.
Answer the following statement true (T) or false (F)
False
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Explain the function of shift valves.
What will be an ideal response?
A datum feature is a real physical part of the object that may have surface variations.
Answer the following statement true (T) or false (F)
For the three-phase circuit in Fig. 12.59, find the average power absorbed by the delta-connected load with Z? = 21 + j24 ?.
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In many communication systems a device called a “mixer” is used. In its simplest form a mixer is simply an analog multiplier. That is, its response signal y(t) is the product of its two excitation signals. If the two excitation signals are 
plot the magnitude of the CTFT of y(t) Y(f) and compare it to the magnitude of the CTFT of x1(t). In simple terms what does a mixer do?