100+ Free PRC ABE Practice Questions

Pass your PRC Agricultural and Biosystems Engineer Licensure Examination exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

~45% Pass Rate

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More Philippines PRC Engineering Exams

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

2026 Statistics

Key Facts: PRC ABE Exam

100

Practice Questions

ABE prep

2 days

Exam Duration

PRC

₱900

Registration Fee

PRC 2026

70%

Required GWA

RA 10915

Governing Law

Official Gazette

3 times

Refresher Trigger

PRC rules

The PRC Agricultural and Biosystems Engineer board exam consists of a 2-day written test, costs ₱900, and requires a weighted average of 70% to pass. It covers four major subjects (power, water, structures, bioprocess) making up 72% of the content, plus math, basic engineering, environmental sciences, and professional ethics under RA 10915. Candidates who fail three times must complete a refresher course.

Sample PRC ABE Practice Questions

Try these sample questions to test your PRC ABE exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following tractor features is primarily used to adjust the working depth of a soil-engaging implement automatically based on draft load variations?

A.Draft control of the three-point hitch system

B.Position control of the three-point hitch system

C.Differential lock engagement lever

D.Independent power take-off (PTO) clutch

Explanation: Draft control automatically adjusts the height of the implement in response to draft resistance, raising the implement slightly when encountering heavy soil to maintain tractor traction. Position control keeps the implement at a constant depth relative to the tractor frame regardless of load.

2In a standard four-stroke diesel engine, during which stroke do both the intake and exhaust valves remain completely closed while the hot, high-pressure combustion gases expand and drive the piston from top dead center toward bottom dead center?

A.Compression stroke

B.Intake stroke

C.Power stroke

D.Exhaust stroke

Explanation: During the power (or expansion) stroke, fuel is injected and ignites near TDC, and both valves remain closed to contain the expanding high-pressure combustion gases that drive the piston downward. The compression stroke also has both valves closed, but fuel injection and combustion initiate at the very end of it, leading directly into the power stroke where expansion work occurs.

3An internal combustion engine has a total cylinder displacement volume of 500 cubic centimeters and a clearance volume of 50 cubic centimeters. What is the compression ratio of this engine?

A.11.0:1

B.10.0:1

C.9.0:1

D.12.0:1

Explanation: The compression ratio (CR) is calculated as (Displacement Volume + Clearance Volume) / Clearance Volume. Here, CR = (500 + 50) / 50 = 550 / 50 = 11.0. Thus, the ratio is 11.0:1.

4A diesel engine has an indicated power of 75 kilowatts and a brake power of 60 kilowatts. What is the mechanical efficiency of this engine?

A.80%

B.75%

C.85%

D.90%

Explanation: Mechanical efficiency is the ratio of brake power (delivered at the crankshaft) to indicated power (developed inside the cylinder), expressed as a percentage. Thus, mechanical efficiency = (60 kW / 75 kW) * 100% = 80%.

5Calculate the effective field capacity of a 3-meter wide disc harrow operating at a speed of 8 kilometers per hour if the field efficiency is 80%.

A.1.92 hectares per hour

B.2.40 hectares per hour

C.1.54 hectares per hour

D.2.12 hectares per hour

Explanation: Theoretical field capacity (Ct) = Width (m) * Speed (km/h) / 10 = 3 * 8 / 10 = 2.40 hectares per hour. Effective field capacity (Ce) = Ct * Field Efficiency = 2.40 * 0.80 = 1.92 hectares per hour.

6What is the required drawbar power in kilowatts if a tractor exerts a pull of 15 kilonewtons at a constant travel speed of 6 kilometers per hour?

A.25.0 kW

B.90.0 kW

C.15.0 kW

D.45.0 kW

Explanation: Drawbar power (DbP) in kW is calculated as Pull (kN) * Speed (m/s). Speed of 6 km/h is equal to 6 / 3.6 = 1.667 m/s. Therefore, DbP = 15 kN * 1.667 m/s = 25.0 kW. Alternatively, DbP = (Pull in kN * Speed in km/h) / 3.6 = (15 * 6) / 3.6 = 25.0 kW.

7Which of the following statements best describes a primary operating difference between a moldboard plow and a disc plow?

A.A disc plow rolls over obstacles and is preferred in stony or root-infested soils, whereas a moldboard plow is easily damaged in such conditions.

B.A moldboard plow is better suited for sticky clay soils because its shear angle is larger than that of a disc plow.

C.A disc plow requires significantly less draft power per unit width than a moldboard plow in all soil conditions.

D.A moldboard plow penetrates hard, dry soils more effectively than a disc plow of the same weight.

Explanation: Disc plows feature rotating spherical discs that roll over obstacles such as stones and large roots, making them highly durable in rough, abrasive, or cleared soils. Moldboard plows slide through the soil and can hook onto stones or roots, leading to shear bolt failure or frame damage.

8In biomass gasification, what is the typical range of the equivalence ratio (ER) required to ensure partial oxidation and produce high-quality syngas, rather than complete combustion?

A.0.20 to 0.40

B.1.00 to 1.20

C.0.05 to 0.10

D.0.60 to 0.80

Explanation: The equivalence ratio (ER) is defined as the ratio of actual air supplied to the stoichiometric air requirement. For gasification, ER is kept between 0.20 and 0.40 to allow partial oxidation. An ER above this range leads toward combustion, while an ER below it leads toward pyrolysis.

9What is the peak power capacity of a solar PV array required to operate a DC solar irrigation pump with a power requirement of 1.2 kilowatts if the system safety factor (derating factor) is 1.25?

A.1.50 kWp

B.0.96 kWp

C.1.20 kWp

D.1.80 kWp

Explanation: To find the solar PV array peak power (kWp), multiply the pump power requirement by the system safety (derating) factor. Here, Peak Power = 1.2 kW * 1.25 = 1.50 kWp. This ensures the array accounts for losses like temperature, dust, and wiring.

10A wind pump rotor has a design start-up wind speed. What is the main structural reason why multi-bladed wind pumps are preferred for mechanical water pumping over two-blade high-speed turbines?

A.Multi-bladed rotors produce high starting torque at low wind speeds.

B.Multi-bladed rotors have a higher tip-speed ratio.

C.Multi-bladed rotors achieve higher aerodynamic lift-to-drag ratios.

D.Multi-bladed rotors are cheaper and easier to balance dynamically.

Explanation: Mechanical water pumping requires lifting a column of water, which exerts a high initial static load (torque). Multi-bladed wind turbines have high solidity, which provides the high starting torque needed to initiate pumping at low wind speeds, despite having lower efficiency at high speeds.

About the PRC ABE Exam

The Agricultural and Biosystems Engineer Licensure Examination is the national professional credential for practicing ABEs in the Philippines. It evaluates core technical competencies in power and machinery, land and water resources, structures and environment, and bioprocess engineering, along with basic engineering sciences, agricultural/fishery/ecological sciences, project management, and professional laws like Republic Act No. 10915.

Assessment

100 multiple-choice questions (simulated practice test)

Time Limit

2 days

Passing Score

GWA of 70% with no subject score below 50%

Exam Fee

₱900 (PRC Board of Agricultural and Biosystems Engineering)

PRC ABE Exam Content Outline

18%

Power, Energy, and Machinery Engineering

Tractor and engine operations, mechanical power transmission, primary and secondary tillage, seeding/harvesting equipment, and renewable energy.

18%

Land and Water Resources Engineering

Crop water requirements, surface/sprinkler/drip irrigation, subsurface drainage (Hooghoudt's), soil conservation (USLE), and open channel hydraulics.

18%

Structures and Environment Engineering

Livestock house ventilation, farm building structural design (concrete, wood, steel), biogas digesters, R-values and insulation, and waste storage.

18%

Agricultural and Bioprocess Engineering

Wet and dry basis moisture content conversions, thin-layer drying models, milling recovery, materials handling equipment, psychrometrics, and cold storage.

Project Management, Research, and Extension

Feasibility metrics (NPV, IRR, BCR, payback period), experimental designs (RCBD, CRD), ANOVA calculations, and agricultural extension.

Mathematics and Basic Engineering Principles

Calculus optimization, statistics, statics, mechanics of materials, thermodynamics, fluid dynamics, and heat transfer.

Agri-Fishery, Ecological, and Environmental Sciences

C3 vs C4 crop photosynthesis, fertilizer nutrient calculations, aquaculture water quality, and ecological energy transfer.

Laws, Professional Standards, and Ethics

Republic Act No. 10915, professional code of ethics, National Building Code ABE referral code, and PABES standards.

How to Pass the PRC ABE Exam

What You Need to Know

Passing score: GWA of 70% with no subject score below 50%
Assessment: 100 multiple-choice questions (simulated practice test)
Time limit: 2 days
Exam fee: ₱900

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

PRC ABE Study Tips from Top Performers

1Master moisture content conversions between wet basis (wb) and dry basis (db) since this is a guaranteed question in the bioprocess section.

2Practice solving Manning's open-channel flow velocity and flow rate equations using rectangular and trapezoidal dimensions.

3Understand the difference between draft and position control in tractor three-point hitches, and study standard PTO spline speeds.

4Review concrete mix design volumetric ratios (Class A 1:2:4, Class B 1:2.5:5, Class C 1:3:6) and timber section modulus calculations.

5Familiarize yourself with the key sections of Republic Act No. 10915, including ABE scope of practice, CPD requirements, and code of ethics.

6Memorize the metric Rational Method equation (Q = CIA/360) and the USLE soil erosion factors to solve hydrology problems quickly.

7Know how to calculate the simple payback period, NPV, and interpret IRR for agricultural project feasibility studies.

Frequently Asked Questions

What is the passing criteria for the PRC ABE board exam?

To pass the examination, a candidate must obtain a weighted general average (GWA) of at least 70%, with no grade lower than 50% in any of the subject areas.

What happens if I fail the PRC ABE board exam three times?

According to Republic Act No. 10915, any candidate who fails the licensure examination for the third time must enroll in and complete a refresher course from an accredited educational institution before they can take the board examination again.

What is the difference between PAES and PABES?

PAES stands for Philippine Agricultural Engineering Standards. Under the 2016 law (RA 10915), the scope of the profession was expanded to include 'Biosystems', and these standards were updated and renamed to PABES (Philippine Agricultural and Biosystems Engineering Standards) to include modern bioprocessing, ecological, and environmental systems.

Are calculators allowed in the board examination?

Yes, scientific calculators are allowed during the board exam, but they must comply with the PRC list of approved non-programmable calculators. Programmable calculators are strictly prohibited.

Who is eligible to take the PRC ABE board exam?

Graduates of a Bachelor of Science in Agricultural and Biosystems Engineering (BSABE) or its equivalent from a college or university recognized by the Philippine government are eligible to apply. Applicants must be Filipino citizens or citizens of foreign countries with engineering reciprocity.

100+ Free PRC ABE Practice Questions

Explore More Philippines PRC Engineering Exams

PRC Aeronautical Engineer Licensure Examination (Philippines)

PRC Chemical Engineer Licensure Examination

PRC Chemist Licensure Examination

PRC Civil Engineering Licensure Examination

PRC Electrical Engineering Licensure Examination

PRC Electronics Engineering Licensure Examination