Refrigerants that have a low Ozone Depletion Potential (ODP) will, in turn, have a high "Total Equivalent Warming Impact" (TEWI).
Answer the following statement true (T) or false (F)
False
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The outer electron shell is known as a(an) ________.
A) Distant ring B) Unstable shell C) Valence ring D) None of these
(a) Consider that two infinitely long parallel edge dislocations are viewed on a simple two dimensional x?y diagram, such as Fig. 4.37. This first of these dislocations is located at x = 0, y = 0 and is positive. Its slip plane is horizontal and this contains the x?axis. The other dislocation is negative and also lies in a horizontal slip plane separated from that of the first dislocation by a vertical distance (y) of 10b, where b is the Burgers vector for both dislocations. Now assume the first dislocation is fixed in place, and the second can move parallel to the x?axis. With the aid of a computer, plot ??, the x component of the force (per unit length) between the dislocations, as function of x from x = ?50 nm to x = +50 nm. Let u =86 Gpa, b = 0.248 nm, and v =0.3.
(b) Discuss the significance of the variation of Fx with distance as the mobile dislocation moves from x= - ? to x= +?.
Which of these tools is MOST likely to be used to determine the starter circuit voltage drop test?
A) Ohmmeter B) Voltmeter C) Ammeter D) Meg ohmmeter
How should refrigerant be recovered from a chiller?
A) Always begin the refrigerant recovery using vapor recovery methods. B) Refrigerant should be pushed out by pressurizing the chiller with 50 psig of nitrogen. C) Always begin the refrigerant recovery using liquid recovery methods. D) The chiller should be operated to build pressure before starting recovery.