In the heating mode, the reversing valve will normally be _____.
a. energized
b. de-energized
c. back-seated
d. front-seated
b. de-energized
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(a) As explained in Sec. 10.10, a ternary alloy may have a ternary eutectic point, at which four phases may coexist. Describe the nature of these four phases. How many degrees of freedom are there when the four phases coexist in a ternary alloy? What is the meaning of this?
(b) A ternary alloy may also have a three?phase field. How many degrees of freedom will there be in the three?phase field? Explain the significance of this number of degrees of freedom. (c) In a ternary alloy a single?phase field may also occur. How many degrees of freedom will it contain?
Divide the following fractions and reduce to lowest terms:3 3/4 ÷ 1/8 =
What will be an ideal response?
What device helps you manage a WLAN that consists of many APs?
A. heavyweight AP B. wireless controller C. wireless distribution system D. wireless router
The control that stops the condensing unit if the head pressure climbs too high is classified as a ____.
A. safety control B. thermostat C. temperature control D. speed control