AREA 3: AB STRUCTURES & ENVIRONMENT ENGINEERING & BIOPROCESS ENGINEERING & ALLIED SUBJECTS (VOLUME 7)

RED (WRONG ANSWER)  / GREEN (CORRECT ANSWER) 

Question 1: The speed of fixed rubber roll from the adjustable roller on a rubber roll huller is slower by

A) 20 %

B) 25 %

C) 30 %

D) None

Explanation: https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-215.pdf

Question 2: A material handling equipment which consists of cups attached to a chain or belt that revolves around a bottom-and-top pulley where the cups are discharged.

A) bucket elevator

B) chain conveyor

C) belt conveyor

D) none of the above

EXPLANATION: FEECO. (2025). Bucket Elevator Basics. Retrieved August 21, 2025, from https://feeco.com/bucket-elevator-basics

Question 3: Measure the ability of the machine to remove hulls with minimum breakage.

A) coefficient of hulling

B) coefficient of breakage

C) coefficient of wholeness

D) none of the above

EXPLANATION: https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-215.pdf

Question 4: A machine used to remove the germ and pericarp from the corn kernel.

A) degerminator

B) conditioner

C) corn mill

D) all of the above

Explanation: https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/PAES-210-2000.pdf

Question 5: Grit # od a milled corn with particle size between 1.5mm to 1.7mm.

A) Grit #10

B) Grit #12

C) Grit #14

D) Grit #20

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/PAES-210-2000.pdf

Question 6: Clearance adjustment between the two hullers should be maintained at about ___.

A) 1⁄2 of the thickness of paddy

B) 1⁄3 of the thickness of paddy

C) 1⁄4 of the thickness of paddy

D) 2⁄3 of the thickness of paddy

Explanation: https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-215.pdf

Question 7: It is the maximum by-product recovery required in the performance criteria for corn mill.

A) 21 %

B) 31%

C) 64%

D) None

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/PAES-210-2000.pdf

Question 8: It is the ratio of the weight of corn grits to the total weight of corn kernel input expressed in percent.

A) Input capacity

B) Main product recovery

C) Milling recovery

D) AOTA

Explanation: https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/PAES-210-2000.pdf

Question 9: Roof rat is considered as one of the major species of rodents affecting grains in the country.Its scientific name is:

A) Rattus rattus

B) Rattus norvegicus

C) Mus musculus

D) None

Explanation:https://www.fao.org/3/y5019e/y5019e00.html

Question 10:The best index for determining the optimum time to harvest for grains is:

A) Color of grains

B) Date of planting

C) Moisture content

D) Dryness of flag leaf

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/PAES-203-2004-Agricultural-Machinery-Grain-Harvester-Specifications.pdf

Question 11: A pretreatment method for fruits and vegetables to retard spoilage and darkening of fruits

A) Blanching

B) Sulfuring

C) Sterilizing

D) AOTA

Explanation:http://hgic.clemson.edu/factsheet/drying-fruits/?utm_source

Question 12: Drying time requirement for solid yellow or slightly brown-flecked bananas in a dehydrator.

A) 4-8 hours

B) 10- 16 hours

C) 1-3 hours

D) 8-10 hours

Explanation: https://www.healthycanning.com/drying-bananas?utm_source

Question 13: It is the simplest method of separating solid particles from air by allowing air to pass through a large chamber to cause the solid material to fall due to its weight.

A) settling chamber

B) momentum separation

C) gravity separation

D) None

Explanation:https://study.com/academy/lesson/separation-of-mixtures-in-earth-materials-methods-assessment.html#:~:text=Winnowing%20or%20Sedimentation%20%2D%20These%20methods,to%20sink%20to%20the%20bottom.

Question 14: It is the method of cleaning on a rapid filter by reversing the direction of flow of water.

A) back splashing

B) reverse cleaning

C) back washing

D) None

Explanation:https://www.sciencedirect.com/topics/engineering/rapid-filtration

Question 15: Ratio of vapor pressure of water in the product to the water vapor pressure of pure water at the same temperature.

A) Absolute humidity

B) Relative humidity

C) Humidity ratio

D) Water activity

Explanation:https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/inspection-technical-guides/water-activity-aw-foods?utm_source

Question 16: Difference between the maximum and the minimum moisture content randomly sampled after drying.

A) Moisture discrepancy

B) Moisture increase

C) Moisture gradient

D) Moisture decrease

Explanation:https://www.delmhorst.com/blog/bid/364759/What-is-Moisture-Gradient-and-How-Can-You-Measure-it?utm_source

Question 17: Minimum milling efficiency of multicrop micromill is:

A) 90%

B) 80%

C) 85%

D) 95%

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-238.pdf?utm_source

Question 18:Type of multicrop micromill which consists of two roughed plates, one is stationary and the other is rotating. The material is reduced by crushing and shearing action.

A) Hammer mill

B) Roller mill

C) Micromill

D) Attrition mill

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-238.pdf?utm_source

Question 19: A machine that cooks ginger juice to produce ginger tea (instant “salabat”).

A) Crystallizer

B) Extractor

C) Decorticator

D) None

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-236.pdf?utm_source

Question 20: Machine that extracts juice through tapered, rotating screw that moves and compresses the crops. Extraction takes place by shearing and pressing actions.

A) Roller press type

B) Piston press type

C) Screw press type

D) NOTA

Explanation: https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-234.pdf

Question 21: A classification of multicrop washer-peeler that has an effective capacity of more than 40 kg/hr.

A) Small-scale

B) Medium-scale

C) Commercial-scale

D) None

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-232.pdf

Question 22: A classification of multicrop washer-peeler that has an effective capacity of up to 15 kg/hr.

A) Small-scale

B) Medium-scale

C) Commercial-scale

D) NOTA

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-232.pdf

Question 23: Rice grain from which the hull, the germ and the bran layers have been completely removed.

A) Under milled

B) Regular milled

C) Well milled

D) Over milled

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-227-micromill-test.pdf

Question 24: What is the passageway for grains to be loaded into the silo?

A) Flint corn

B) Yellow corn

C) Dent corn

D) NOTA

Explanation:https://www.epicgardening.com/types-of-corn/

Question 25: 30. Based on PAES, the standard pallet size should be:

A) 150 cm x 60 cm

B) 152 cm x 61 cm

C) 252 cm x 81 cm

D) 180 cm x 80 cm

Explanation: https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/419.pdf

Question 26: Storing of paddy or corn kernels in bags usually made of jute (gunny) or polyethylene and normally accommodates 44-50 kilos.

A) Bag storage

B) Bulk storage

C) Warehouse

D) NOTA

Explanation: https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/419.pdf

Question 27: This are wooden frames used on concrete floors for stacking bags to prevent direct contact between the grains and the floor.

A) Dunnage

B) Pallet

C) Tarima

D) AOTA

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/PNS-PAES-419-2015-Agricultural-Structures-Warehouse-for-Bag-Type-Storage-of-Grains.pdf

Question 28: Type of paddy separator that makes use of the difference in length and specific gravity.

A) Compartment type

B) Tray-type

C) Seven-type

D) None

Explanation:https://www.scribd.com/document/328989998/III-6-RicePostProd-1-8

Question 29:Average bulk density of potatoes is:

A) 670 kg/m3

B) 650 kg/m3

C) 600 kg/m3

D) 620 kg/m3

Explanation: ttps://amtec.uplb.edu.ph/wp-content/uploads/2019/07/417.pdf

Question 30: The heat content of the moist air per unit weight of dry air above a certain reference and temperature is called:

A) specific heat

B) entropy

C) enthalpy

D) AOTA

Explanation:https://extension.psu.edu/psychrometric-chart-use#:~:text=boundary%20is%20reached.-,Enthalpy,wet%2Dbulb%20temperature%20and%20enthalpy.

Question 31: Moisture content determination method used for commercial designation and also universally used by farmers, agriculturists, and merchants.

A) Moisture content dry basis

B) Moisture content wet basis

C) Equilibrium moisture content

D) None

Explanation:https://www.scribd.com/document/454260406/Moisture-Content-Representation

Question 32: What is connected to the sidewall stiffeners to provide continuous circular reinforcement around the silo?

A) Grain velocity

B) Apparent velocity

C) Instantaneous velocity

D) Average velocity

Explanation:https://www.thermopedia.com/content/276/

Question 33: Refers to the difference between ambient temperature and the temperature of the drying air resulting from the addition of heat by the dryer burner.

A) Temperature fallo

B) Wet bulb depression

C) Temperature rise

D) None

Explanation: https://www.researchgate.net/figure/Drying-air-temperature-ambient-air-temperature-drying-air-relative-humidity-ambient_fig4_322132947

Question 34: The final moisture content, wet basis, of the fruits to be dried in the fruit dryer shall be:

A) 13%

B) 14%

C) 15%

D) 12%

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/pns-paes-248-2010.pdf

Question 35: Refers to clearing or purging the plenum chamber or duct of any volatile gases prior to ignition of the burner.

A) Drying

B) Post-ventilation

C) Recirculation

D) Pre-ventilation

Explanation:https://elibrary.asabe.org/azdez.asp?AID=32004&CID=s2000&JID=2&T=2&utm_source

Question 36: The heat transfer principle used in heated-air mechanical grain dryer is:

A) Free convection

B) Natural convection

C) Forced convection

D) Radiation

Explanation:https://iieta.org/journals/ijht/paper/10.18280/ijht.430138#:~:text=This%20drying%20system%20uses%20the,husks%20as%20the%20main%20fuel.&text=The%20combustion%20furnace%20uses%20rice,equipped%20with%20air%20heating%20pipes.&text=Centrifugal%20fan%20(blower)%20with%202,distributed%20throughout%20the%20grain%20layer.

Question 37: What consists of a flat continuous belt in tension that is positioned between rollers driven by pulleys with intermittently spaced idlers for support?

A) Pressure system

B) Exhaust air movement system

C) Suction system

D) None

Explanation:https://www.ncbi.nlm.nih.gov/books/NBK143277/#:~:text=In%20these%20cases%2C%20a%20positive,corridor%20(CDC%2C%202003).

Question 38: The band or layer of product in which most of the drying is occurring at any instant.

A) AOTA

B) Drying space

C) Drying front

D) Drying zone

Explanation:https://www.fao.org/4/s1250e/S1250E0v.htm?utm_source

Question 39: A type of micromill with milling capacity of 50 kg/hr to less than 100 kg/hr.

A) Household model

B) Village model

C) Both a and b

D) None

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/paes-226-micromill-specs.pdf?utm_source

Question 40: Refers to the return of the portion of the exhaust air to the air intake of the dryer, or to the return of underdried grain to the dryer or container from which it was removed.

A) Tempering

B) Curing

C) Recirculation

D) Conditioning

Explanation:https://www.ontario.ca/page/reducing-energy-use-grain-dryers?utm_source

Question 41: Friction type rice mill performing simultaneous hulling and whitening operations and having a milling capacity of 50-250 kg/hr.

A) Attrition mill

B) Roller mill

C) Micromill

D) AOTA

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2020/06/PNS-BAFS-PAES-270_2019-Silo.pdf

Question 42: Stacking density of palay is:

A) 15 bags per m3

B) 10 bags per m3

C) 20 bags per m3

D) 25 bags per m3

Explanation:https://amtec.uplb.edu.ph/wp-content/uploads/2019/07/PNS-PAES-419-2015-Agricultural-Structures-Warehouse-for-Bag-Type-Storage-of-Grains.pdf

Question 43:Drying method/system that employs a combination of heated air drying and aeration cooling.

A) Dryeration

B) Two-stage drying

C) Sun drying

D) None

Explanation: https://www.fao.org/4/t1838e/T1838E0x.htm#:~:text=Dryeration,for%20moisture%20removal%20during%20cooling.

Question 44: A method of determining the properties of air which measures the electrical resistance of a film of moisture-absorbing materials exposed to the gas.

A) Mechanical hygrometer

B) Dew point method

C) Electric hygrometer

D) Wet bulb method

Explanation:https://www.scribd.com/document/152524943/Methods-for-the-Determination-of-Humidity#:~:text=There%20are%20several%20methods%20for,or%20resistance%20of%20hygroscopic%20materials.

Question 45: A graphical representation of the thermodynamic properties of moist air.

A) Psychrometry

B) Psychrometric chart

C) Psychrometric table

D) Psychrometric data

Explanation:https://www.sciencedirect.com/topics/engineering/psychrometrics#:~:text=The%20psychrometric%20chart%20is%20a%20graphical%20representation,the%20thermodynamic%20properties%20which%20impact%20moist%20air.n

Question 46: What is connected to the sidewall stiffeners to provide continuous circular reinforcement around the silo?

A) Ambient Temperature

B) Dry bulb temperature

C) Wet bulb temperature

D) Dewpoint temperature

Explanation:https://pressbooks-dev.oer.hawaii.edu/atmo/chapter/chapter-4-water-vapor/#:~:text=more%20water%20vapor?-,Dew%20Point%20Temperature,humidity%20is%20less%20than%20100%25.

Question 47: A process in psychrometry wherein the ambient air is heated to a desired drying temperature at constant humidity and vapor pressure.

A) Humidifying

B) Cooling

C) Heating

D) Dehumidying

Explanation: https://www.ashrae.org/technical-resources/ashrae-handbook

Question 48: A temperature of air or a product, indicated by a thermometer, which is not affected by water vapor content of the air.

A) Wet bulb temperature

B) Dew point temperature

C) Dry bulb temperature

D) AOTA

Explanation:https://www.ashrae.org/technical-resources/ashrae-handbook

Question 49: Type of thresher where the material is fed between the revolving drum and a stationary concave on one end and goes around the cylinder axially and discharges at the other end of the machine.

A) Hold-on type

B) Throw-in type

C) Through-flow thresher

D) Axial-flow thresher

Explanation:https://www.researchgate.net/publication/337134498_Farm_Machinery_and_Power_Engineering

Question 50: The amount of moisture that is in equilibrium with the existing environment for the grain can either gain or lose moisture from or to the surrounding air.

A) AOTA

B) Moisture content, dry basis

C) Equilibrium moisture content

D) Moisture content, wet basis

Explanation:https://www.knowledgebank.irri.org/step-by-step-production/postharvest/drying/drying-basics/grain-and-air-properties#:~:text=Rice%20is%20a%20hygroscopic%20material,both%20grain%20and%20seed%20quality.

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