Before starting an oil furnace, the technician should check to see that:
A) The flame-observation door is open for viewing.
B) The clean-out doors are open to allow unwanted debris to be blown out during ignition.
C) The flame-observation door and all clean-outs are closed.
D) The flame-observation door and all clean-outs are open.
C
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A(n) _____ is a collection of stories, announcements, and explanations that is sent on a regular basis to a particular group of people
a. newspaper b. newsletter c. magazine d. brochure
Sketch a typical control loop.
What will be an ideal response?
Sam's telephone number is 753-2133. The digits 753 are called the:
A) area code B) suffix C) exchange code D) none of the above
The term reluctance in magnetic circuits is like the term ________ in electrical circuits
A) current B) resistance C) capacitance D) voltage