The expansion device in a mechanical refrigeration system _____.
a. raises the temperature of the refrigerant
b. acts as a heat exchanger
c. provides a pressure drop
d. raises the pressure of the refrigerant
c. provides a pressure drop
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After checking any control circuit fuses or breakers when troubleshooting heat pump wiring, which of the following should be checked?
a. Terminations and wire nuts b. Primary voltage at the transformer c. Wire sizes d. Secondary voltage at the transformer
Go online and fi nd three products for new applications of polymers, e.g., wound care, conductivity of light or electricity. Write a paragraph on how these products were developed and how they will be used.
What will be an ideal response?
On many variable displacement engines the cylinder deactivation is done by use of ________
A) Cam shifting B) A two stage hydraulic lifter C) Spark retard D) None of these
What do data signals on a wireless communication system travel on?
A. fixed frequencies B. electromagnetic waves C. digital radiation D. alternate current