AGRICULTURAL PROCESSING, STRUCTURES, ELECTRIFICATION, AND ALLIED SUBJECTS - Part 2

Fan efficiency

It is the measure of the power output of fan in relation to its power input.

Up to 18 inches

The recommended depth of grain in a shallow bed dryer is:

1/2 of the thickness of paddy grain

Recommended clearance for disk huller to achieve higher brown rice recovery with less breakage

14 m/s

Manufacturer’s prescribed peripheral velocity of disk huller is

13 m/s

Manufacturers’ recommendation for the speed of cone in a vertical abrasive whitening cone must not exceed

1000 rpm

Manufacturers’ recommendation for the speed of a horizontal abrasive whitener

Aeration

The process in which air moves through stored grains at a low rate to maintain its quality

18 - 25 sacks

Maximum allowable safe height of sack pile in bag storage.

10 bags

Recommended stacking density per cubic meter of space for palay

12 bags

Recommended stacking density per cubic meter of space for corn

15 bags

Recommended stacking density per cubic meter of space for milled rice

2592 bags

If a pile of milled rice is 8-m long, 6-m wide, and 3.6-m high, how many bags of rice can be piled?

111 sq. m

If 5000 bags of paddy is to be piled 20-bags high, how may square meters of floor space is require? Assume a bag height of 0.225 m/bag

Modified atmosphere

A storage method wherein the gas concentration in storage atmosphere is changed

Aspiration

A process of separating lower density materials from grains

Scalper

A primary cleaner which separates larger particles or performs rough cleaning of grains

0.2 - 0.25 sq. m per ton

Recommended size of scalper for paddy is

77 rpm

What is the theoretical rpm of a bucket elevator whose head pulley diameter is 0.2 m and the bucket projection is 0.1 m?

65 rpm

If the operational efficiency of the bucket elevator above is 85% of the theoretical speed, what is the operational speed of the elevator?

1.92 hp

What is the theoretical horsepower requirement of a bucket elevator whose capacity is 545 kg/min and lift of 10.7 m. The elevator is loaded down side.

Parboiling

A hydrothermal treatment of paddy before milling.

Top of the huller

In a disk huller, the stationary disk is located at:

40 - 60 kg brown rice per hour

The capacity of a compartment type separator is:

15 compartments

A rice mill has an input capacity of 1 ton per hour. If the huller of the rice mill has an efficiency of 95%, what is the size of the compartment type paddy separator would you recommend?

dockage

The amount of foreign materials in a sample of grains

Bulk storage

A storage practice in which grains are stored in loose form in a large container.

trier

A small metal probe for taking samples of paddy

Dunnage

Wooden frame used in staking bags of rice.

Godown

A warehouse used for storing paddy or rice either in bulk or in bags.

Scalping

Rough cleaning of paddy to remove most foreign materials prior to drying and storage.

113F

A drying temperature of 45°C is equal to:

65 %

Five tons of paddy milled in 6 hours produces 3950 brown rice and 3250 kg of milled rice. What is the milling recovery?

0.79

What is the hulling coefficient of the huller in item above?

487.50 kg

If the head rice recovery of paddy in item above is equal to 85 %, what is the amount of broken grains?

1000 kg

What is the amount of rice hull produced during milling in item above?

80 - 90%

The optimum relative humidity for storing fruits and vegetables is

1767.4 kg

A two-ton mechanical dryer dries paddy from 24% to 14% in 8 hours. What is the final weight of the product after drying?

250 kg/hr

What is the drying capacity of the dryer in the item above?

29.07 kg/hr

What is the moisture reduction per hour in the item above?

22 deg

The coefficient of friction of rice to a steel materials is 0.41. What is the minimum angle of hopper required for the system?

Drying front

The divisional layer between the dried and the undried products in a drying system.

One calorie

Amount of heat required to raise one gram of water one degree centigrade.

126.5 m3

What is the peak storage capacity of a 5-m diameter grain storage bin with an eave height and a minimum angle of fill of 6 m and 28 deg., respectively? [V= ((πD^2)/4) (EH) + ((πD^2)/4) (D/2 tanØ/3)]

Angle of friction

The angle whose tangent equals the coefficient of friction between surfaces of the stored materials.

Moisture wet basis

Expression of moisture content commonly used in commercial scale.

471 kilos

A solar dryer is used to reduce the moisture content of 4 tons of paddy from 25% to 15% wet basis. The amount of moisture removed is about:

Dryer

A device that remove excess moisture generally by forced ventilation with or without of heat.

Vertical bin dryer

A batch-type dryer with vertical holding bin and is used for deep-bed drying.

Recirculating dryer

A batch-type dryer equipped to intermittently mix grain during drying operation.

Batch dryer

A batch dryer with horizontal grain holding bin is passed continuously through a drying chamber utilizing agitator until the grain reaches the specified moisture content reduction per pass.

plenum chamber

An air chamber maintained under pressure usually connected to one or more distribution duct in a drying system

rice mill

A machine that converts paddy to milled rice

rubber roll huller, disk huller, steel-huller

An example of rice husker

fanning mill

A screen cleaner that employs air blast to assist in cleaning.

whitener

A machine used to remove bran.

tripper

It is a part of a belt conveyor that is used to discharge materials over the end of the belt by a diagonal scraper.

burr mill

It is a burr or plate mill.

fan efficiency

It is the measure of the power output of fan in relation to its power input.

plenum chamber

A dryer component that converts velocity pressure of the fan to static pressure

25%

The percentage speed difference between rubber rollers.

69%

The maximum percentage of milling recovery obtained from a rice mill is

½ of the thickness of paddy grain

Recommended clearance of disk huller to achieve higher brown rice recovery with less breakage.

It is more effective in grinding grains with higher moisture content of up to 25%

A vertical-axis hammer mill is more advantageous than the horizontal-axis hammer mill for the reason that

attrition mill

A grain milling machine consisting of two cast iron disk plate with teeth or serration on one or both faces

Attrition mill

A grain milling machine suitable for grinding grains with moisture content of up to 30%.

roller mill

A type of mill used for crushing grains by allowing it to pass through a two rotating cylinder steel one of which is smaller than the other.

450 kg/m3

The density of pig and poultry feed is approximately

250-400 rpm

The auger that is centrally located at the vertical feed mixer usually rotates at a speed of

Horizontal feed mixer has high power requirement

Horizontal feed mixer is not advantageous for feed mixing as compared with vertical feed mixer for the reason that

take-up units

A type of bearing used for tightening bucket elevator belts.

increase

When a bucket elevator is to be fed at the downside section instead of the upside section of the elevator booth, its power requirement will

flat chain feeder, auger feeders, round chain feeders

A type of conveyor feeder used for feeding birds in cages on a poultry farm

Load cell

An electrically-operated device commonly used for automatic bagging of grains or feeds

14 m/s

Manufacturers’ prescribed peripheral velocity of disc for disk huller

13 m/s

Manufacturers’ recommendation for maximum speed cone on a vertical abrasive whitening machine

1000 rpm

Manufacturers’ recommendation for the speed of horizontal abrasive whitener

Scalper

A primary cleaner which separates larger particles or rough cleaning of rough rice.

0.2 - 0.25 m2/ton

Recommended size of scalper for paddy cleaning

77 rpm

What is the theoretical rpm of a bucket elevator whose head pulley diameter is 0.2 m and the bucket projection is 0.1 m

65 rpm

It is the operational speed of the bucket elevator in an item above is 85% of the theoretical speed, what is the operational speed of the elevator?

2.19 hp

What is the theoretical horsepower requirement of a bucket elevator with a capacity of 545 kg/min and lift of 10.7 m and the elevator is loaded down side

Rubber huller

A rice mill huller which produces high milling recovery.

Top of the huller

On the disk huller, the stationary disk is located on

fans

An air moving device which produces high airflow but low head

pump

A device that is used to move oil

screw

If mixing is needed to carryout during conveying, the suitable conveyor is

to drive empty, to drive at horizontal, to drive vertical

The horsepower requirement of belt conveyors includes power

pneumatic

A conveyor with high power requirement per unit capacity

cross flow fan

An air moving device suitable for grain cleaning

increase

If the diameter of a blower is increased, the pressure will

paddy separator

A machine which separates paddy from brown rice

polisher

A machine that smoothen milled rice.

Belt conveyor

Recommended for conveying product with less damage

Blower

Air moving device commonly used for drying which produces high pressure but low airflow

magnetic separator

Recommended to remove metallic element during conveying.

Paddy separator

A machine that separates brown rice from paddy

25%

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

whitener

A machine that is used to remove the bran from the brown rice

polisher

A machine that is used to make milled rice shiny after removing the bran layer