The flame in a gas fired furnace is burning with heavy yellow tips. What is the problem?
What will be an ideal response?
There is not enough primary air. Check the air shutter opening and for debris in the furnace.
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For a straight pull, the minimum length for a pull box with two 1" conduits and one 4" conduit on one wall and two 1" conduits and one 4" conduit entering the opposite wall is _____. (Assume the conductor size is No. 4 AWG or larger, but operating at less than 600V.)
a. 24" b. 26" c. 32" d. 34
Carcinogenic compounds cause:
What will be an ideal response?
In the early stages of plant nitrogen deficiency, the most obvious symptoms are:
A) brown spots and tiny holes on the underside of most leaves. B) yellowish colors in the oldest leaves. C) purpling of the youngest leaves. D) brown edges on leaves scattered randomly all over the plant. E) yellowing of the youngest leaves.
Compression packing is mostly made of various types of fibers. These fibers may include vegetable fibers, mineral fibers, animal fibers, and ____.
A. polycarbonate fibers B. cotton fibers C. recycled fibers D. synthetic fibers