An open-loop system does not have a ____.
A. controller
B. final control element
C. feedback loop
D. none of the above
Answer: C
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Failure to properly ground the ignition module on a gas furnace may result in _____
a. flame sensor burnout b. high igniter current c. failure of the flame sensor to function d. excessive flame rectification
One advantage of rooftop units on small commercial buildings is that:
A) They are available in larger capacities than central station systems. B) They operate more efficiently than systems located inside the building. C) They offer a substantial savings of space within the building. D) They are easier to service than systems located inside the building.
According to NEMA definitions, which of the following is a type of open motor?
a. Nonventilated b. Explosion-proof c. Weather-protected d. Water-to-air-cooled
Why do you have to discard the emery board after used?
What will be an ideal response?