Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AREA 1_ Agricultural Machinery and Mechanization > HARVESTING AND THRESHING EQUIPMENT > Flashcards

HARVESTING AND THRESHING EQUIPMENT Flashcards

1
Q

– process of gathering the useful portion of the crop from the field

A

Harvesting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

process of separating the grains from the straw. Additionally, it may
include cleaning the grains

A

Threshing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Systems of harvesting and threshing of rice: _ _ use of hand tools: sickle, scythe, yatab, 80 – 160 man-hrs/ha

A

Manual harvesting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Systems of harvesting and threshing of rice: _ _Use of flails or sticks
* Hampasan
* Foot threshing
* Animal treading
* 140 – 220 man-hrs/ha

A

Manual threshing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Systems of harvesting and threshing of rice: _ _ Use of pedal thresher at 100 manhrs/ha
* Power thresher at 12 man-hrs/ha

A

Mechanized threshing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Systems of harvesting and threshing of rice: _ _ * Use of manually-operated
harvester at 50 man-hrs/ha
* Power harvester at 5 man-hrs/ha

A

Mechanical harvesting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  • 3 – 21 man-hrs/ha
  • Field losses – 1.5 – 6 %
A

Combine harvesting – both operations done by a single machine – combine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  • 3 – 21 man-hrs/ha
  • Field losses = 2 – 6 %
A

Stripping harvesting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

removal of grains from panicle without cutting the
straw - stripper

A

Stripping harvesting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Systems of harvesting and threshing of rice: if manual harvesting manual threshing are combined, field loss is

A

5-16%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Systems of harvesting and threshing of rice: if manual harvesting and mechanized threshing are combined, field loss is

A

3-10%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Systems of harvesting and threshing of rice: if mechanical harvesting and mechanical threshing are combined, field loss is

A

3-6%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Operations done by a combine and stripper: . Separating the rows
2. Cutting the standing crop
3. Conveying the cut materials into the
threshing section
4. Threshing
5. Shaking the straw to separate loose grains
from the straw
6. Cleaning the grains of chaff
7. Conveying the grains to the tank or sack

A

COMBINE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Operations done by a combine and stripper: 1. Separating the rows
2. Stripping
3. Cleaning the grains
4. Conveying the grains to the tank or sacks

A

STRIPPER

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Factors affecting the choice of system: IDENTIFY WHAT are INCLUDED

  1. Kind of crop
  2. Crop Color Preferences
  3. Timeliness of operation
  4. Topography
  5. Farm size
  6. Type of culture (row or broadcasted, upland or lowland)
  7. Moon phases
  8. Availability and cost of labor
  9. Required Labor inputs
  10. Availability of capital
A
  1. Kind of crop
  2. Timeliness of operation
  3. Topography
  4. Farm size
  5. Type of culture (row or broadcasted, upland or lowland)
  6. Availability and cost of labor
  7. Availability of capital
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

A major factor affecting choice of system is _ _ _ because it affects
field losses, time available for the next crop and grain quality

A

timeliness of operation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Field losses (%)
One week before maturity

A

0.77

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Field losses (%)
At maturity

A

3.35

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Field losses (%)
one week after maturity

A

5.63

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Field losses (%)
two weeks after maturity

A

8.64

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Field losses (%)
three weeks after maturity

A

40.70

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Field losses (%)
four weeks after maturity

A

60.46

23
Q

If the crop is harvested too early, it will have a large percentage of

A

imperfectly formed
kernels

24
Q

The field should be drained _ _ weeks before harvesting to harden the soil

A

1 – 1.5 weeks

25
Q

Harvesting equipment is classified into two categories: what are those?

A

Groupings of harvesting and Cutting mechanisms

26
Q

Harvesting equipment (Groupings of harvesters) include the sickle, scythe, yatab, lingkao and cradle

A

Hand tools

27
Q

Harvesting equipment (Groupings of harvesters)
– a machine that cuts the standing crop, conveys the cut
crop to one side, and lays them down in an orderly manner

A

Reapers-windrower

28
Q

Harvesting equipment (Groupings of harvesters)
a machine that cuts the standing crop, binds the cut crop, and
lays down the bound crop to one side

A

Reaper-binder

29
Q

Harvesting equipment (Cutting mechanisms)
– employed in hand tools

A

Slicing/tearing action

30
Q

Harvesting equipment (Cutting mechanisms)
use of sharp or dull-edged blades
moving at high velocity of 2,000 fpm to 9,000 fpm

A

High velocity, single-element, impact action

31
Q

Harvesting equipment (Cutting mechanisms)
shearing action between the moving and
stationary blades

A

Two-element, scissor type action

32
Q

Threshing Equipment is classified into three categories, what are those?

A

Methods of threshing, mechanical threshers, and, cleaning systems

33
Q

THRESHING EQUIPMENT:
* Methods of threshing: grains are detached from their panicles because of a rubbing action
as in treading by man, animal and vehicle.

A

Rubbing action

34
Q

Output of man treading is

A

14 kg/hr

35
Q

grains are accelerated faster than their panicles and are detached as
in hampasan and mechanical threshers.

A

Impact action

36
Q

grains are detached from their panicles when the straw is pulled
through a “V” configuration or a comb-like device is passed through the panicles.

A

Stripping action

37
Q

Output of hampasan is

A
38
Q

It is one of the classifications of threshers equipment that employs the impact method

A

Mechanical threshers

39
Q

Mechanical threshers are classified into 4:

A

Power source, type of feeding, direction of threshing materials, and type of cylinder teeth

40
Q

Mechanical threshers classification that manual as in pedal thresher or power thresher as in
engine-driven thresher

A

power source

41
Q

in type of feeding, – Straws do not pass through the threshing
section

A

hold-on feeding

42
Q

in type of feeding that has ❖ Low power requirement
❖ Lightweight construction
❖ Examples: Pedal thresher and Japanese combine

A

hold-on feeding

43
Q

in type of feeding it Straws pass through the threshing section

A

Throw-in feeding

44
Q

❖ High power requirement
❖ Heavyweight construction
❖ Examples: Axial-flow thresher and US combine

A

Throw-in feeding

45
Q

Materials are feed between the revolving
cylinder and stationary concave and go straight out of the
thresher tangentially.

A

Tangential-flow

46
Q

About _% of the grains pass through the concave and
the rest are separated in subsequent operations.

A

60%

47
Q

Materials are fed between the revolving cylinder and
stationary concave on one end, go around the cylinder several
times axially and discharge at the other end.

A

Axial-flow

48
Q

About _% of the grains are separated from the straw
at the cylinder.

A

90%

49
Q

type of cylinder teeth are:

A

a. Wire-loop
b. Peg-tooth
c. Rasp-bar

50
Q

Separation of the bulky straw, chaff, empty kernels and very light impurities from the
grains

A

Cleaning systems

51
Q

Light materials can be separated from the grains by

A

winnowing using natural wind or
blower.

52
Q

straws do not pass through the thresher and only the removal
of the chaff and light materials are needed using blowers and screens

A

For hold-on threshers,

53
Q

straws pass through the thresher and cleaning is done using a
straw walker, blower and screens.

A

For throw-in threshers,

AREA 1_ Agricultural Machinery and Mechanization (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions