In an A/C system, the refrigerant changes state from a _____________ in the evaporator
A) liquid to a gas
B) gas to a liquid
C) Both A and B
D) Neither A nor B
A) liquid to a gas
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A ____ has a lower secondary voltage than primary voltage.
a. step-down transformer b. resonant transformer c. constant voltage transformer d. planar transformer
When a process technician first starts up a unit, he/she will typically set the controller in:
a. AUTO b. MANUAL c. CASCADE
A characteristic of water vapor, but not other states of water is:
A) Water is compressible. B) Water exerts equal pressure to the sides of a container in which it is placed. C) Small changes in the volume of water occur with changes in temperature. D) Water molecules move about freely.
Corrosion is caused by _____
a. acids created by the combination of air and liquid b. viscosity that is too high c. pressure that is too high d. a low pour point