Relays are electromechanical switches that lack auxiliary contacts.
Answer the following statement true (T) or false (F)
False
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A piston-cylinder device contains a vapor-liquid equilibrium mixture of water at T=150 °C. The quality of the mixture is initially q=0.90 and the volume of the mixture is initially 1 m3. The vessel is compressed at constant T and P until the quality is q=0.3.
A) Determine the initial masses of the liquid and vapor phases. B) Determine the work required to complete the compression. C) Determine the change in enthalpy of the mixture.
____ are doubled 2 * 4 pieces with spaces between them used to stiffen wall forms.
a.Snap ties b.Walers c.Tie rods d.Expansion joints
Purging refrigerant lines with nitrogen during their installation prevents _____
a. acid formation b. overheating c. copper oxide formation d. corrosion buildup
For purposes of ventilation, a large opening at least __________ feet is much better than several small ones.
A. 1X1 B. 2X2 C. 3X3 D. 4X4