Agricultural and Biosystems Engineers Licensure Examination (ABELE) · Philippines · Professional Regulatory Board of Agricultural and Biosystems Engineering, PRC
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)
Agricultural and Biosystems Engineers Licensure Examination (Philippines, PRC)
Written to the syllabus because no verified topic-frequency data exist. Aquaculture engineering sits in the Land and Water Resources paper (32 percent): pond types and site selection, dike cross-sections and earthwork, seepage by Darcy's law, water budgets and exchange, aeration and oxygen balance, and recirculating systems. Forest engineering sits in the Structures and Environment paper (36 percent): forest road classes, drainage and culvert sizing, logging systems and machinery, log volume formulas, and kiln drying and lumber treatment structures. The law itself (RA 10915 sections 4, 5, 17, 18, 33–36, 42) is examined in the laws and ethics content.
How our questions for Agricultural and Biosystems Engineers Licensure Examination spread across the units of Aquacultural & Forest Engineering (regional). Difficulty: 32 easy, 60 medium, 24 hard.
| Logging machinery | 25 | |
| Aeration of ponds | 18 | |
| Aquaculture pond design | 16 | |
| Recirculating aquaculture systems | 14 | |
| Water exchange in ponds | 12 | |
| Fishing technology basics | 11 | |
| Forest roads | 11 | |
| Scope of aquaculture and forest engineering under RA 10915 | 9 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
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.
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.
What road density, in metres per hectare, corresponds to parallel forest roads spaced 500 m apart?
B. 20 m/ha
Road density = 10,000 m²/ha ÷ 500 m = 20 m/ha. 5 and 50 m/ha are decimal slips; 200 m/ha has no basis.
Which practice is part of reduced impact logging?
A. Pre-harvest mapping of trees and planned skid trails before felling begins
RIL relies on inventory and planned trails, directional felling, winching from the trail and vine cutting. Driving to every stump, ignoring trail layout and leaving vines all increase damage.
A wood sample weighs 25 kg green and 20 kg oven-dry. What is its moisture content as used in timber practice?
D. 25 percent
Timber MC is on the oven-dry basis: (25 − 20)/20 × 100 = 25 percent. 20 percent is the wet-basis value; 80 and 125 percent are mass ratios, not moisture contents.
A sawmill produces 0.44 m³ of lumber from a log of 0.80 m³. What is the volume recovery?
B. 55 percent
Recovery = 0.44/0.80 = 55 percent. 45 percent is the loss; 182 percent inverts the ratio; 36 percent subtracts 0.44 from 0.80.
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