What must always function properly in a boiler to keep NOx emissions under control?
A. Air registers and fuel valves
B. Air registers and dampers
C. Dampers and draft fans
D. Draft fans and fuel valves
A. Correct. To keep NOx emissions under control, the burner air registers and fuel valves must always function properly.
B. Incorrect. To keep NOx emissions under control, the burner air registers and fuel valves must always function properly.
C. Incorrect. To keep NOx emissions under control, the burner air registers and fuel valves must always function properly.
D. Incorrect. To keep NOx emissions under control, the burner air registers and fuel valves must always function properly.
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Determine the Pasquill stability category for the following scenarios and the type of plume to be observed from a smokestack.
a. An overcast day with leaves rustling. b. A sunny afternoon with the solar altitude 75 degrees above the horizon and loose paper blowing on the street. c. A sunny afternoon with the solar altitude 75 degrees above the horizon and smoke from a match rises vertically. d. A later summer day with broken low clouds and smoke from a match rises vertically. e. Nighttime when chimney smoke drifts but does not move wind vanes. f. A winter day when chimney smoke drifts but does not move wind vanes. What will be an ideal response?
Animals can be considered organic when they have been given antibiotics
Indicate whether the statement is true or false
A meter that uses a moving pointer or needle to indicate a value on a scale is called a(n) ________ meter.
a. digital b. analog c. needle d. voltage
Technician A says that the EGR system helps to control nitrous oxide (N2O). Technician B says that all engines use an EGR valve to lower combustion temperature. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician