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 papersAgricultural and Biosystems Engineers Licensure Examination (ABELE) is a licensing and registration exam run by Professional Regulatory Board of Agricultural and Biosystems Engineering, PRC, for candidates in Philippines. Paper-based, 2 days (Day 1 6 hours; Day 2 5 hours + 4 hours). Non-programmable calculator only; the Dec 2025 programme bans the Casio fx-991ES/ES Plus by name.
Source: prc.gov.ph.
Checked against the exam body's published information. Formats and fees change; confirm the current edition there before you book.
How much water a crop needs, when to give it, how to measure and convey it, and how to design surface irrigation.
Our 23 Agricultural and Biosystems Engineers Licensure Examination questions in this subject: 5 easy, 17 medium, 1 hard, across 11 units.
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
These 10 were written to Agricultural and Biosystems Engineers Licensure Examination and are not shown on any other exam's page.
In the FAO-56 single crop coefficient curve, in which order do the growth stages occur?
D. Initial, crop development, mid-season, late season
The season runs initial (to about 10 % ground cover), development (to effective full cover), mid-season (full cover to start of maturity) and late season (to harvest). Kc is flat in the initial and mid stages and changes linearly in the other two.
During a 30-day mid-season stage, reference ET averages 5.0 mm/day and Kc mid is 1.15. What is the crop water use for the stage?
B. 172.5 mm
ETc = 1.15 × 5.0 = 5.75 mm/day; × 30 days = 172.5 mm. 150 mm ignores Kc; 130.4 mm divides by Kc; 17.25 is a mm–cm slip.
For transplanted lowland rice, which item is part of the crop water requirement in addition to crop evapotranspiration?
A. Water for land soaking and puddling, standing water, and seepage and percolation losses
Rice water requirement includes nursery, pre-saturation and puddling, the standing water layer and seepage and percolation. Leaching nitrate is undesirable, frost protection is not part of rice culture, and tensiometer water is negligible.
A sharp-edged circular orifice 100 mm in diameter discharges freely under a head of 0.5 m on its centre. With Cd = 0.61, what is the discharge?
A. 15.0 L/s
A = π × 0.1²/4 = 0.00785 m²; √(2gh) = √(2 × 9.81 × 0.5) = 3.13 m/s; Q = 0.61 × 0.00785 × 3.13 = 0.0150 m³/s = 15.0 L/s. 24.6 L/s omits Cd; 60.0 L/s uses the diameter as the radius; 10.6 L/s drops the 2 in 2gh.
Compared with a sharp-crested weir of similar capacity, a Parshall flume is preferred on a sediment-laden farm channel mainly because it:
B. Causes much less head loss and passes sediment through without silting up
The flume's head loss is small (about a quarter of a weir's) and its throat is self-cleaning. It still needs a head reading, it must be built to exact dimensions (a disadvantage), and above the transition submergence a correction is needed.
A concrete rectangular channel 1.0 m wide carries water 0.5 m deep on a slope of 0.001. With Manning n = 0.015, what is the discharge?
C. 0.418 m³/s
A = 0.5 m², P = 1.0 + 2 × 0.5 = 2.0 m, R = 0.25 m. V = (1/0.015) × 0.25^(2/3) × 0.001^0.5 = 66.7 × 0.397 × 0.0316 = 0.837 m/s. Q = 0.418 m³/s. 0.664 uses R = y; 0.0132 forgets the square root of slope; 0.623 uses the US-unit constant 1.49 with SI units.
Which crop group is most commonly irrigated by borders?
C. Close-growing crops such as wheat, alfalfa and pasture
Borders suit close-growing crops on gentle slopes. Row crops are usually furrow irrigated, rice is grown in level basins, and steep hillsides need other methods.
What is the main consequence of closing (blocking) the lower end of a graded border?
B. Runoff is eliminated, but water ponds at the lower end and can over-irrigate it
A blocked end stores the would-be runoff at the tail, giving extra infiltration there. It does not speed advance or eliminate deep percolation.
Level basin irrigation is especially well suited to:
A. Lowland rice and crops on fine-textured, low-intake soils on level land
Basins hold standing water, which suits rice and low-intake soils. On very sandy soils with small streams, water infiltrates near the inlet before covering the basin; steep land needs terracing; ponding-sensitive crops suffer.
A level basin of 40 m × 25 m is to receive 60 mm. The inflow is 15 L/s. How long is the application time?
D. 66.7 min
Volume = 40 × 25 × 0.06 = 60 m³; time = 60 / 0.015 = 4,000 s = 66.7 min. 6.7 and 667 min are factor-of-ten slips; 4.0 min divides seconds by 1,000.
This plan follows where our questions actually fall, so the time goes where the marks are likely to be. It is our reading of the syllabus, not the exam body's weighting.
Read the manual chapters for these first and do every worked question you can find on them.
Aim for one sitting per unit, then mixed questions across them.
Learn the definitions, classifications and standard numbers; these units are more often recalled than worked.
Come back to these after a first pass, untimed, and read every explanation, including for the options you rejected.
Do these early in revision so they are fast on the day.
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