What water treatment method adds chemicals to reduce coarse suspended solids, silt, turbidity, and colloids through the use of a clarifier?
A. Softening
B. Coagulation
C. Deaeration
D. Filtration
A. Incorrect. Softening is the treatment of water to remove dissolved mineral salts such as calcium and magnesium, known as hardness, in boiler feedwater.
B. Correct. Coagulation adds chemicals to reduce coarse suspended solids, silt, turbidity, and colloids through the use of a clarifier.
C. Incorrect. Deaeration removes oxygen or other gases from boiler feedwater by increasing the temperature and boiling out the dissolved gases.
D. Incorrect. Filtration removes coarse suspended matter and sludge from coagulation or from water softening systems.
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In the order of operations, do ____________________ last.
Fill in the blank(s) with the appropriate word(s).
Repeat Problem 1–31 for:
A customer complains that every time the lights are turned on in the vehicle, the dash display dims. Which of these is the MOST likely cause which of these conditions?
A) Normal behavior for VTF dash display B) Poor ground in lighting circuit causing a voltage drop to dash lamps C) Normal behavior for LED dash displays D) Feedback problem from a short-to-voltage between headlights and dash display
The ____ refers to the response time of the instruments in a control loop.
A. time lag B. dynamic response C. dead time D. pure lag