Early hydronic systems did not have circulators. Instead, they relied on the ____ of hot water to move water between the boiler and the heat emitters.
a. molecular attraction
b. thermonics
c. hydraulics
d. buoyancy
d. buoyancy
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Within what temperature range does a typical chilled water system operate?
a. 32–38°F (0–3°C) b. 38–42°F (3–6°C) c. 42–55°F (7–13°C) d. 55–72°F (13–22°C)
The circuit conductors between the service equipment and the final branch circuit overcurrent protection device is a(n) __________.
a. open circuit b. branch circuit c. feeder circuit d. service conductor
Which term describes the speed of data transmission?
A) Baud rate B) Frequency C) Pulse width modulation D) Oscillator speed
Technician A says galvanic corrosion occurs when two dissimilar metals come into contact with each other. Technician B says an insulated steel bolt or one with a special coating can be used to hold two aluminum parts together. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B