PAES 204:2000

Question 1

This standard is a revision of the PNS 143:1988 “Specification for Mechanical Paddy
Thresher”

Answer 1

PAES 204:2000

Question 2

throw-in type of thresher which allows the cut plants to move in a helical manner around the
threshing cylinder with a net effect of moving the material axially between the feeding and
discharge outlets

Answer 2

axial flow thresher

Question 3

ratio of the weight of grains blown with the chaff by the thresher fan, to the weight of the
total grain input of the thresher, expressed in percent

Answer 3

blower loss

Question 4

empty grains and crushed straw being discharged from the threshing chamber

Answer 4

chaff

Question 5

concave component
iron grill frame partially or fully surrounding the cylinder on which the threshing elements
rubs, shear and/or impact the cut plants

Answer 5

concave grate

Question 6

grains which show signs of fissures or fractures or splinters

Answer 6

cracked grains

Question 7

grain content
ratio of the weight of the grains present in the panicles, to the total weight of the grain and
straw in the same sample

Answer 7

grain-straw ratio

Question 8

type of thresher wherein the panicles of the cut plants are fed into the threshing chamber
while the stalks are mechanically or manually held during the threshing operation

Answer 8

hold-on thresher

Question 9

grains that were broken and/or dehulled (partially or fully) as a result of threshing operation

Answer 9

mechanically damaged grain

Question 10

machine used to detach and separate the palay from the panicles

Answer 10

mechanical rice thresher

Question 11

amount of moisture in the grain expressed as percentage of the total weight of the sample
(wet basis)

Answer 11

moisture content

Question 12

paddy
rice
rough rice
unhulled grain of Oryza sativa L., that is, grain with the hull/husk

Answer 12

palay

Question 13

type of threshing cylinder wherein spikes or pegs are attached on the periphery of the
cylinder in tandem or in helical arrangements

Answer 13

peg-tooth cylinder

Question 14

ratio of the weight of clean grains, to the total weight of unclean grains sample, expressed in
percent

Answer 14

purity

Question 15

type of threshing cylinder wherein threshing is done between bar-like protrusions in parallel
orientation laid on the periphery of the cylinder and stationary bars built into or attached to
the concave grate

Answer 15

rasp-bar cylinder

Question 16

engine speed indicated in revolutions per minute (rpm) of the engine shaft as specified by the
engine manufacturer for operation at nominal continuous load

Answer 16

rated engine speed

Question 17

ratio of the weight of grains that fell out from the machine during threshing operation, to the
weight of the total grain input of the thresher, expressed in percent

Answer 17

scattering loss

Question 18

ratio of the weight of grains that come out of the threshing chamber with the straw, to the
weight of total grain input of the thresher, expressed in percent

Answer 18

separation loss

Question 19

cut plants length measured from the point of cut to the tip of the panicle

Answer 19

straw length

Question 20

grains that are detached from the panicles by the thresher inclusive of mature, immature, and
damaged grains

Answer 20

threshed grain

Question 21

threshing chamber
part of the thresher where the grains are detached and separated from the panicles

Answer 21

threshing unit

Question 22

threshing drum
part of the threshing unit that rotates about an axis and it is equipped with either pegs, rasp
bars, or wire loops on its periphery

Answer 22

threshing cylinder

Question 23

ratio of the weight of the threshed grains collected at all outlets, to the total grain input of the
thresher, expressed in percent

Answer 23

threshing efficiency

Question 24

attachments of the threshing cylinder such as pegtooth, wire-loop and rasp-bar that detaches
the grains from the panicles

Answer 24

threshing element

Question 25

ratio of the weight of the threshed grains collected at the main grain outlet, to the weight of
the total grain input of the thresher, expressed in percent

Answer 25

threshing recovery

Question 26

throw-in type of thresher wherein cut plants are fed between the rotating cylinder and
stationary concave and the threshed materials/straws are discharged out of the threshing
chamber tangentially

Answer 26

through flow thresher

Question 27

type of thresher which detaches the grains by feeding the cut plants into the machine

Answer 27

throw-in thresher

Question 28

sum of the weights of collected threshed grains and all grains loss during threshing

Answer 28

total grain input

Question 29

ratio of the weight of grains that remained in the panicles of the plants fed into the threshing
chamber, to the weight of total grain input of the thresher, expressed in percent

Answer 29

unthreshed loss

Question 30

type of threshing cylinder wherein wires of the same arc and size are attached on the
periphery of the cylinder in tandem arrangement with or without the threshing concave

Answer 30

wire-loop cylinder