The preferred method for raising the pressure of a low pressure chiller in order to test for leaks is:

A) Adding nitrogen to the evaporator. B) Charging the chiller with R-410A.
C) Adding more refrigerant. D) Circulating warm water through the chiller.


D

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What is the result of multiplying two or more numbers together?

a. Divisor b. Dividend c. Quotient d. Product

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Pretend you don’t know and can’t look up the vapor pressure of butane at 250 K. What are the solutions for V [m3/mol] from the van der Waals equation for n-butane at T = 250 K and P = 0.2 MPa. Give only the solutions that *could* represent stable equilibrium phases, based upon what you know.

A. (0.000 150, 0.000 549, 0.009 81) B. (0.000 549) C. (0.0176) D. (0.000 150, 0.00981) E. None of these are the real solutions

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Soldering is the preferred method of copper wire.

Answer the following statement true (T) or false (F)

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What should a DMM display when the positive lead is connected to the anode and the negative lead to the cathode of a diode, known to be functional?

A. continuity B. no Continuity C. high resistance D. OL

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