What is the average oxygen content of air by volume?

The correct firing interval of a 4-stroke, 3-cylinder engine is:

The thermal efficiency of most diesel engines is approximately:

(Computation) A tractor exerts a draft of 12 kN at 4 km/h. Compute the drawbar power.

(Computation) A four-cylinder diesel engine has bore 100 mm and stroke 120 mm. Compute displacement.

A tractor engine develops a brake horsepower of 45 hp. If mechanical efficiency is 80%, what is the indicated horsepower?

(Computation) A 35-hp tractor operates 6 hrs/day with specific fuel consumption 0.25 L/hp·hr. Daily fuel used:

(Computation) A hydropower turbine delivers 50 kW under 12 m head at 80% efficiency. Compute flow rate (ρ=1000 kg/m³, g=9.81 m/s²).

A gasoline engine has clearance volume 120 cc and total volume 720 cc. What is compression ratio?

During testing a gasoline engine consumed 1.2 L/hr; fuel heating value 35,000 kJ/L; brake power 2.63 kW. Approximate thermal efficiency:

Tractor size is determined by:

Which sector is considered the most mechanized in the Philippines?

The conventional system of rice harvesting and threshing in the Philippines is:

Which machine is used to reduce rice crop moisture to safe storage level?

The farm machinery component that transmits power from the tractor engine to the implement is:

Which of the following is NOT part of routine maintenance?

Which operation is done to cut and invert soil?

Which is a disadvantage of mechanization?

The most common type of rice transplanter in Asia is:

Which machine converts forage into silage?

(Computation) A 1.8 m-wide harvester operates at 3.5 km/h with 80% field efficiency. Effective field capacity:

(Computation) A plow requires 9 kN draft at 4.5 km/h. Draft power:

(Computation) A thresher processes 500 kg/hr paddy at 95% efficiency. Clean grain output:

(Computation) A 35 hp tractor for 6 hrs/day at 0.25 L/hp·hr consumes:

(Computation) A reaper 1.2 m wide at 2.5 km/h with 70% efficiency - field capacity:

(Computation) A corn sheller processes 1.5 tons/hr at 90% efficiency. Effective output:

Recommended safe moisture content for rice storage:

Which machine is widely used for sugarcane harvesting?

Main advantage of disc plow over moldboard plow:

Correct travel speed for rice reaping:

Purpose of a combine harvester:

Lubrication reduces:

Preventive maintenance schedule is usually based on:

Machine used to separate grains by rubbing/impact:

Efficiency when theoretical capacity = 1 ha/hr and actual = 0.8 ha/hr:

The primary role of manufacturing in ABE:

The Philippine testing center for agri-machinery (reference testing center) is:

Which international standard is widely followed for tractor testing?

Which dryer performance indicator is the ratio of water evaporated to energy input?

Field efficiency is defined as:

The parameter in tractor testing measuring the relation between pull and speed is:

(Computation) Grain sample weighs 120 g wet, 100 g dry. Moisture content (wet basis):

(Computation) A knapsack sprayer delivers 0.7 L/min, nozzle spacing 0.5 m, travel speed 5 km/h. Application rate (L/ha):

(Computation) Rice mill input 2000 kg → outputs 1300 kg milled rice, 200 kg bran, 500 kg husk. Milling recovery:

(Computation) A dryer evaporates 8 kg water/hr with heat input 20 MJ/hr and latent heat 2250 kJ/kg. Thermal efficiency:

Best single measure of thresher performance includes:

(Testing principle) A verification (acceptance) test is done to:

A sensor whose resistance changes with temperature is called:

Which component converts electrical signal to mechanical motion?

Which device converts analog to digital signals?

In a feedback control system, the difference between desired and actual value is the:

A device that detects soil moisture by electrical resistance is a:

PLC stands for:

(Computation - corrected) A load cell has a sensitivity of 2 mV/V at full scale. With excitation 10 V, output at full scale is:

(2 mV/V × 10 V = 20 mV) (Computation - clarified) A stepper motor produces torque 0.5 N·m and runs at 600 rpm. Compute mechanical power (approx):

(Computation) A temperature sensor outputs 10 mV/°C. At 60°C, voltage =

(Computation) Soil moisture sensor reads 3 V at 15% MC and 1 V at 5% MC. If reading is 2.4 V, estimate MC:

(Theory) In SCADA, the field data-gathering remote unit is usually called:

Which is NOT part of a standard closed-loop control loop?

Capacitive transducers are used for:

The first step in a feasibility study is often:

The discount rate used in evaluating projects (minimum acceptable rate) is:

A project is considered feasible if BCR is:

The document submitted for DA-project funding evaluation is commonly called:

The most common tool to monitor timelines is:

Which project evaluation tool considers time value of money?

R&D in ABE primarily aims to:

Participatory extension means:

The system that uses maps and spatial analysis in agriculture is:

A key GIS application in ABE is:

In GIS, overlay analysis is used to:

(Computation) Project cost ₱1,000,000 ; net returns ₱250,000/yr for 6 yrs. Payback period:

(Computation) Investment ₱500,000 salvage ₱50,000, annual net ₱150,000 for 5 yrs, MARR 12%. NPV ≈

(Computation) Benefits ₱1,200,000; costs ₱1,000,000 (discounted). BCR =

(Computation) Simple interest on ₱50,000 at 10% p.a. for 3 yrs:

(Computation) Compound amount of ₱100,000 at 8% for 3 years:

(Computation - corrected) Present worth of ₱200,000 due in 3 years at 12%:

(Computation) Machine cost ₱200,000 salvage ₱20,000 after 5 yrs, annual net ₱50,000. Payback (approx):

(Computation) A project saving ₱100,000 annually on ₱500,000 investment. Payback:

(Theory) IRR is defined as:

(Project info systems) Examples of info systems used in ABE include Decision Support Systems (DSS), Expert Systems, and:

(Extension methods) Which of the following are extension methods?

(Financial measure) Sensitivity analysis is used to:

(Research tool) A qualitative research tool is:

(Project liquidity measure) Which is typically used?

(Decision) If IRR > MARR the project is:

(Computation) If discounted benefits ₱900,000 and discounted costs ₱850,000, BCR ≈

(GIS) Which of the following GIS tasks helps prioritize areas for mechanization investments?

Under RA 10915, the Professional Identification Card (PIC) issued to registered ABEs shall be renewed every:

The law modernizing the practice of Agricultural and Biosystems Engineering (the ABE Law) is:

The Agricultural & Fisheries Mechanization Law is:

A contractor awarded to build a multipurpose drying pavement must secure a license from:

A LGU constructs an irrigation & drainage system. Under RA10915, plans and technical specs must be signed & sealed by:

A farmers' group imported a combine harvester without BAFE certification. Before distribution, they must:

Under the Rice Tariffication Law (RA 11203), tariffs collected from rice imports are allocated to:

A rice farmer receiving RCEF-funded training/machinery support benefits from a program under which law?

The government body that regulates professionals in the Philippines is:

To pass most PRC licensure exams (general rule) an examinee must obtain a weighted general average (WGA) of at least:

An asset costs $20,000, has a 10-year useful life, and a $5,000 salvage value. Find the book value in the third year using sum-of-years digit method.