Engineers Canada Agricultural / Biosystems / Bioresource / Food Engineering examination syllabus · Canada · Provincial and territorial regulators (syllabus by Engineers Canada)
Original practice questions written to the published syllabus · not past papersFish-pond and recirculating-system design, and forest roads and logging machinery — examined where the law puts them in the profession's scope, as in the Philippines.
In the exams: PRC ABE (RA 10915 §17 lists aquaculture engineering and forest engineering); an aquacultural engineering discipline at IIT Kharagpur (secondary source)
How our questions for Engineers Canada Agricultural / Biosystems / Bioresource / Food Engineering examination syllabus spread across the units of Aquacultural & Forest Engineering (regional). Difficulty: 16 easy, 29 medium, 15 hard.
| Aeration of ponds | 18 | |
| Aquaculture pond design | 16 | |
| Recirculating aquaculture systems | 14 | |
| Water exchange in ponds | 12 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
On a pond farm, why is each pond normally given its own inlet from a supply canal and its own outlet to a separate drainage canal?
D. So that each pond is filled and drained alone, with no pond-to-pond flow
Independent supply and drainage limit disease spread and let each pond be managed separately. Series flow does the opposite, and the arrangement adds rather than saves dike length.
In Darcy's law written as q = k i for seepage from a pond, the symbol i stands for
D. the hydraulic gradient, head loss divided by flow path length
i is the dimensionless hydraulic gradient. Infiltration rate, rainfall intensity and inflow are different quantities.
A pond outlet consists of a concrete box open on the pond side, with grooves in which boards are stacked to set the water level and a screen in front. This structure is called
A. a monk
The monk sets the level by its top board and can draw water from the pond bottom. A turn-down pipe is an elbow rotated to set the level; siphon spillways and drop inlets are flood-passing structures.
A 5,000 m³ pond is given 10 percent water exchange per day as a continuous inflow. What inflow rate is needed?
B. 5.8 L/s
500 m³/day ÷ 86,400 s = 0.00579 m³/s = 5.8 L/s. 58 and 0.58 L/s are decimal slips; 13.9 L/s would deliver the 500 m³ in a 10-hour pumping day, not as a continuous inflow.
A pond receives a steady ammonia-nitrogen load of 5 kg/day that is removed only by flushing with ammonia-free water. What flushing flow keeps the pond at 1 mg/L at steady state?
B. 5,000 m³/day
At steady state C = Cin + P/Q, so Q = P/C = 5,000,000 mg/day ÷ 1 mg/L = 5,000,000 L/day = 5,000 m³/day. The others are factor-of-ten unit slips. 50,000 and 500 m³/day are factor-of-ten slips; 5 m³/day is a factor-of-1,000 slip (litres read as cubic metres).
Pond water has total ammonia nitrogen of 2.0 mg/L at pH 8.5. Taking pKa = 9.25 for the pond temperature, what is the un-ionised ammonia nitrogen concentration?
C. 0.30 mg/L
f = 1/(1 + 10^(9.25 − 8.5)) = 1/(1 + 5.62) = 0.151; NH3-N = 2.0 × 0.151 = 0.30 mg/L. 0.36 uses 10^(−0.75) as the fraction; 1.70 is the ionised part; 1.00 is the answer only at pH = pKa.
Which material is applied to acidic, low-alkalinity fish ponds to raise total alkalinity?
C. Agricultural limestone
Agricultural limestone (calcium carbonate) raises alkalinity and buffers pH. Ammonium sulfate is acid-forming; copper sulfate is an algicide; sodium chloride adds chloride, not alkalinity.
In a recirculating aquaculture system, the biofilter's main function is to
B. convert ammonia to nitrate by nitrifying bacteria growing on media
Nitrification in the biofilter oxidises ammonia to nitrite and nitrate. Screening, oxygenation and degassing are separate unit processes.
A 30 m³ fish tank receives 1 m³/min of treated water. What is its hydraulic retention time?
A. 30 min
Retention time = V/Q = 30/1 = 30 min, i.e. two exchanges per hour. 2 is the exchange rate per hour, 0.5 h⁻¹ is an inverted rate, and 30 h confuses minutes with hours.
In a moving-bed bioreactor (MBBR), the nitrifying bacteria grow on
C. plastic carriers kept in suspension and circulation in the reactor
MBBR carriers move freely in an aerated or mixed tank. Fixed gravel beds, tank walls and fluidised sand are other biofilm arrangements.
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