A heat exchanger is used to supply ____ thermal energy to a process.
A. hot
B. cold
C. both hot and cold
Answer: C
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Flow switches are used to detect the ____________________ of air or liquid through a duct or pipe.
Fill in the blank(s) with the appropriate word(s).
What is the difference between sensors that are NTC and PTC probes?
a. PTC (positive temperature coefficient) resistance increases with temp increase. b. NTC (negative temperature coefficient) resistance decreases with temp increase.
Who is responsible for ensuring that union contracts are followed at construction jobs sites and how do they do this?
What will be an ideal response?
Any person repairing or servicing motor vehicle air conditioning must be certified by:
A. Department of Transportation B. The Ministry of Transportation C. The Environmental Protection Agency D. The Occupational Safety and Health Administration