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.
Sprayers, weeders, mowers, reapers, combines and threshers: how they work, how to calibrate them and where losses come from.
Our 21 Agricultural and Biosystems Engineers Licensure Examination questions in this subject: 6 easy, 13 medium, 2 hard, across 14 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.
Which sprayer is best described as using a high-speed air stream from an engine-driven fan both to shear liquid into fine droplets and to carry them?
C. Motorised mist blower
In the mist blower, liquid is fed into a fast air stream that shears it into fine droplets and carries them, giving low volume rates. The others atomise hydraulically through nozzles.
Which change will make a flat-fan spray coarser, other things being equal?
D. Changing to an air-induction (venturi) nozzle of the same flow
Air-induction nozzles form large air-filled droplets, a much coarser spray. Higher pressure and wider fan angle both make the spray finer; hollow cones are generally finer than flat fans of the same flow.
A 400 L tank is used at 200 L/ha, and the label dose is 1.5 L of product per hectare. How much product goes into each full tank?
A. 3.0 L
Area per tank = 400/200 = 2 ha. Product = 2 × 1.5 = 3.0 L. Dividing instead of multiplying gives 0.75 L. 6.0 L reads the dose as per 100 L of water (4 × 1.5).
Roll-type mower-conditioners are preferred for legumes such as lucerne because they
C. crimp stems while handling leaves gently, limiting leaf loss
Legume leaves shatter easily; intermeshing rolls crush stems to speed drying without much leaf loss. Flail or impeller conditioners abrade grasses.
A combine with a 4.2 m header travels at 4 km/h with 75% field efficiency in wheat yielding 5 t/ha. The MOG to grain ratio is 1.2. The MOG feed rate is about
C. 7.6 t/h
EFC = 4.2 × 4 × 0.75/10 = 1.26 ha/h. Grain = 1.26 × 5 = 6.3 t/h. MOG = 1.2 × 6.3 = 7.56 t/h. 6.3 t/h is grain, not MOG; ignoring field efficiency gives 10.1 t/h.
A combine shows grain riding over the rear of the sieves with lots of chaff in the tank sample. The most likely cause is
C. fan air too weak, so chaff blankets the sieves
Too little air lets chaff mat on the sieves, so grain cannot pass through and rides off the back; dockage in the tank rises. Too much air blows grain out but leaves a clean sample.
Field inspection shows many unthreshed heads in the straw discharged from a combine. The first adjustment to try is
C. increase cylinder speed or reduce concave clearance in small steps
Unthreshed heads indicate too gentle threshing. Increase aggressiveness in small steps while watching damage. Faster travel would worsen it.
Pedal-operated and small powered paddy threshers commonly use
B. a wire-loop drum against which bundles are held
The wire-loop drum strips grain by impact and combing from heads held against it, leaving straw intact.
The main reason for chopping fodder before feeding livestock is to
B. reduce wastage and selective feeding at the manger
Chopping stops animals from picking leaves and leaving stems and makes mixing easier; it does not change protein content.
In a sugarcane chopper harvester, the component that cuts stalks into billets is the
A. chopper
Base cutters sever the stalk at ground level; the topper removes the green top; the chopper cuts billets; the extractor fans remove trash.
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.
Last updated · How Laisha writes and checks its pages · Report a mistake
US$10 a month · one price worldwide · cancel any time
| Free | Smarter | |
|---|---|---|
| Grow guides, pest pages, articles | Read all | Read all |
| Ask Laisha | 5 a day | Up to 1,000 a month |
| Exam practice | The sample on each page | Every question, timed papers |
| Crop calendar and pest alerts | — | For your own fields |
| Calculators and tools | — | All |
| Uploads and reports | — | 100 a month, real files |
An AI operating system for agriculture: free guides, manuals and tools written for every country.