Describe what happens when excess air enters the furnace.
What will be an ideal response?
The furnace typically operates with a little excess of air to ensure complete combustion. Modern burner design consumes 100% of the fuel with a nominal excess of 10 to 15% oxygen. Excess oxygen in the furnace is carefully controlled as it enters the secondary and primary registers. This control takes place as the fuel and primary air mix at the burner and is enhanced by adjustments on the secondary air registers mounted on the outside of the burner. Excess oxygen creates a hazardous condition in the furnace.
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Describe the three components of total control delay for a given lane group.
What will be an ideal response?
Identify the compounding period for the following interest statements: (a) nominal 7% per year, compounded monthly; (b) effective 6.8% per year, compounded monthly; and (c) effective 3.4% per quarter, compounded weekly.
What will be an ideal response?
One hundred square feet of roof is called a ____.
A. patch B. plot C. square D. circle
Converting both positive and negative alternating current nodes to DC current is referred to as:
A. Half wave rectification. B. Three phase rectification. C. Full polarity rectification. D. Full wave rectification.