?What is the primary function of a hydronic mixing valve?
A. to raise water temperature coming from the heat source
B. ?to lower water temperature coming from the heat source
C. ?to mix two system fluids
D. ?to regulate flow rates between different zones of a system
Answer: B
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A full-wave bridge rectifier contains
A) two diodes B) three diodes C) four diodes D) one diode
Figure 10-3 In Figure 10-3, measurement data about the process variable is sent to FT401, which is a ____________________. The data is sent to FT401 by ____________________ connector.
Fill in the blank(s) with the appropriate word(s).
An error signal develops when which of the following conditions occur?
A. the set point is changed B. a disturbance appears C. the load demand varies D. all of the above