Which of the following features increases overall efficiency to between 83 and 89%?
A) Barometric damper B) Sealed combustion chamber
C) Aquastat controller D) Flame-retention burner
B
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Class III locations are areas that contain combustible ____.
A. dusts B. gases C. fibers D. vapors
Draw the shear and moment curves for the column in Figure P5.46. Sketch the deflected shape. The load P is equal to 55 kips, and the load is eccentric from the column centerline with an eccentricity of 10 in.
Shaft packing and insert mounting, which includes O-rings, V-rings, wedges, and U-cups, describe the _____
found in mechanical seals. a. lubricating surfaces b. closing mechanisms c. primary faces d. secondary seals
Bare skin exposed to liquid refrigerant will:
A) Become immediately stiff and hard like an ice cube. B) Feel like a burn and blister up. C) Withstand 30 seconds of immersion. D) Tingle, but not be seriously harmed.