10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free BCEE questions are organized by exam domain, so you can see how each part of the Board Certified Environmental Engineer - Air Pollution Control blueprint is tested. Reveal the answer and explanation under each question.
Following a reduction in traffic emissions, a near-road monitor records less NO and NO2 but more ozone during otherwise comparable morning conditions. The combined molar concentration of ozone plus NO2 changes little. The strongest explanation for this local pattern is:
Correct answer: A - Reduced local consumption of ozone by freshly emitted nitric oxide.
High stack oxygen and high CO appear together during a boiler's low-NOx burner tuning test. Fuel composition and firing rate are steady; analyzer checks and an air-leak survey are satisfactory. The boiler remains within its safety envelope. To improve CO burnout without abandoning NOx control, the next controlled adjustment should be to:
Correct answer: B - Rebalance staged combustion air, checking the response of both CO and NOx.
At dawn, an elevated plume lies above a shallow surface mixed layer and below an inversion. As the mixed layer deepens, ground-level concentrations spike despite steady emissions. Identify the plume behavior and mechanism.
Correct answer: B - Fumigation: turbulence mixes the plume downward beneath a stable cap.
A stack-test audit finds that a particulate sampling nozzle faced directly into the gas flow, but its entry velocity remained below the local stack-gas velocity. The dust contains a substantial coarse fraction. Leak checks, sample recovery, and gas-volume measurement were satisfactory. How does this velocity mismatch tend to affect the reported particulate concentration?
Correct answer: D - It biases the concentration high because coarse-particle inertia enriches the aspirated sample.
Two collocated optical PM2.5 sensors track each other closely. During humid nights, both report sharp increases, but properly conditioned gravimetric samples collected over the same intervals show no corresponding increase in dry particle mass. Before the sensor values are used in a community exposure assessment, what conclusion is justified by their agreement?
Correct answer: A - Their agreement demonstrates inter-sensor precision, but both may share a humidity-dependent bias.
A proposed new VOC source is subject to nonattainment New Source Review. The permitting authority has established an achievable lowest achievable emission rate (LAER) limit. The applicant requests a less stringent limit because of high incremental control cost and offers additional qualifying emission offsets. How must the control and offset requirements be treated?
Correct answer: A - Retain the LAER limit and satisfy the separate emission-offset requirement.
A coating line generates 80 kg/h of VOC. Its hoods capture 75% of that mass, and a thermal oxidizer destroys 98% of the captured VOC. Uncaptured VOC is released to the atmosphere. The plant must reduce total VOC emissions below 8 kg/h without reducing production. Each proposed retrofit is independently feasible; unchanged equipment retains its present performance. Which single retrofit meets the target?
Correct answer: C - Increase hood capture to 95%, retaining the existing oxidizer.
A pulse-jet baghouse repeatedly cycles from 1.5 kPa differential pressure to 1.0 kPa immediately after cleaning. Its approved operating band is 0.8-1.8 kPa. Gas flow is steady, the bag-leak signal remains at its established baseline, and outlet particulate measurements remain below their limit throughout the cycle. What operating instruction fits this record?
Correct answer: B - Retain the cleaning sequence while trending pressure drop and particulate emissions.
Gaseous HCl removal deteriorates in a packed-bed caustic scrubber. Gas flow, inlet loading, temperature, and total liquid recirculation remain at their validated operating values. Independent checks confirm adequate sump alkalinity and correct pH. Droplet carryover has not increased. Which inspection is most likely to reveal a cause that these measurements would miss?
Correct answer: D - Check the distributor for uneven liquid delivery and incompletely wetted packing.
Two independent temperature sensors in a solvent-vapor carbon adsorber exceed the site's high-high temperature shutdown setpoint and continue rising. Inlet gas temperature is normal, and outlet VOC remains below its emission limit. Which response takes priority?
Correct answer: D - Activate the adsorber's engineered emergency isolation and fire-response procedure.
The full bank has 1,020 more BCEE questions with explanations.
Continue in the free practice test →
View plans