Environmental Engineering PE Exam Flashcards
6 cards from real NCEES practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Environmental Engineering PE Exam flashcards as text
On the NCEES PE Environmental exam, which air pollutant is the primary precursor to ground-level ozone formation?
Answer: Volatile organic compounds (VOCs) and NOx reacting in sunlight
Ground-level ozone forms through photochemical reactions between nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the presence of sunlight — the basis of urban smog.
In the NCEES PE Environmental exam, what does the 'NPDES permit' system regulate under the Clean Water Act?
Answer: Point source discharges of pollutants into waters of the United States
The National Pollutant Discharge Elimination System (NPDES) requires permits for all point source discharges to surface waters, setting effluent limits based on technology and water quality standards.
For the NCEES PE Environmental exam, what is 'nitrification' in biological wastewater treatment?
Answer: The aerobic microbial oxidation of ammonia to nitrite and then to nitrate
Nitrification is a two-step aerobic process: Nitrosomonas converts ammonia to nitrite, then Nitrobacter converts nitrite to nitrate, requiring substantial oxygen and alkalinity.
On the NCEES PE Environmental exam, what does 'fate and transport' modeling of contaminants in groundwater evaluate?
Answer: How contaminants move, dilute, and degrade in the subsurface over time
Fate and transport modeling predicts contaminant plume migration, dilution, adsorption, and biodegradation in groundwater to assess risk and design remediation strategies.
In the NCEES PE Environmental exam, which metric is used to design disinfection systems using the CT concept?
Answer: The product of disinfectant concentration (C) and contact time (T) required for a specified log inactivation of pathogens
CT (concentration × time) is the fundamental design metric for chemical disinfection; regulators specify CT values (in mg/L·min) required to achieve target log-inactivation of Giardia, Cryptosporidium, and viruses.
For the NCEES PE Environmental exam, what is the function of a 'landfill liner system' under RCRA Subtitle D regulations?
Answer: To prevent leachate migration from the landfill into groundwater through low-permeability barriers
RCRA Subtitle D requires composite liner systems (geomembrane + compacted clay) and leachate collection systems to prevent contaminated leachate from reaching groundwater.
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