DESIGN REQ. OF AG. MACHINES Flashcards
The power requirement of a rotary
tiller for primary tillage.
a. 50 kW/m
b. 30 kW/m
c. 70 kW/m
d. All of the above
30 kW/m
The optimum puddler speed for
puddling-type floating tiller is ___.
a. 100-150 rpm
b. 200-250 rpm
c. 300-350 rpm
d. None of the above
200-250 rpm
The minimum peak transmission
efficiency for power tillers.
a. 75 percent
b. 85 percent
c. 95 percent
d. None of the above
85 percent
The disk angle that gives the
minimum draft for a disk plow for a
given width of cut.
a. 30-35 deg.
b. 40-45 deg.
c. 45-50 deg.
d. None of the above
40-45 deg.
What are the plant spacing and row
spacing required for rice?
a. 20-25 cm & 45-60 cm
b. 15-20 cm & 20-30 cm
c. 10-15 cm & 30-45 cm
d. None of the above
15-20 cm & 20-30 cm
What are the plant spacing and row
spacing required for soybean?
a. 4-7 cm & 20-60 cm
b. 5-10 cm & 22-60 cm
c. 3-5 cm & 15-22 cm
d. None of the above
4-7 cm & 20-60 cm
The approximate pressure used in
spraying weedicide.
a. 10-25 psi
b. 25-40 psi
c. 40-60 psi
d. None of the above
25-40 psi
The capacity and the nozzle operating
pressure of a knapsack sprayer are___.
a. 7.5 to 15 liters & 3.5 kg/cm2
b. 17 liters & 3.8 to 4.0 kg/cm2
c. 22.5 liters & 4.2 to 5.4 kg/cm2
d. None of the above
22.5 liters & 4.2 to 5.4 kg/cm2
The power sprayer usually operates at a
pressure ___.
a. under 40 kg/cm2
b. at 40 kg/cm2
c. above 40 kg/cm2
d. None of the above
under 40 kg/cm2
The minimum volumetric efficiency
requirement for Lever Operated Knapsack
Sprayer (LOKS).
a. 80%
b. 88%
c. 95%
d. None of the above
80%
The minimum capacity requirement for
LOKS.
a. 10 liters
b. 15 liters
c. 20 liters
d. None of the above
10 liters
The maximum pumping rate
requirement for LOKS.
a. 20 strokes per minute
b. 40 strokes per minute
c. 60 strokes per minute
d. None of the above
40 strokes per minute
The maximum weight required for LOKS
at full load.
a. 12 kg
b. 22 kg
c. 32 kg
d. None of the above
22 kg
The flow rate requirement for LOKS at
300 kPa mean pressure.
a. 0.3 to 1.4 lpm
b. 1.4 to 2.0 lpm
c. 2.0 to 2.9 lpm
d. None of the above
0.3 to 1.4 lpm
The ratio of the knife velocity to the
forward velocity of a rice reaper.
a. 1.35:1
b. 1.55:2
c. 1.55:0
d. None of the above
1.35:1
Based on field data, percent efficiency
of reaping/binding is ___.
a. 60-80
b. 50-75
c. 40-70
d. None of the above
60-80
Percent efficiency of combining is ___.
a. 50-75
b. 50-80
c. 60-85
d. None of the above
50-75
Based on field data, operating speed
when reaping/binding ranges from ___.
a. 1.6-3.5 kph
b. 2.4-5.0 kph
c. 3.0-5.0 kph
d. None of the above
1.6-3.5 kph
The operating speed when combining
ranges from ___.
a. 1.6-3.5 kph
b. 1.6-4.8 kph
c. 2.4-5.0 kph
d. None of the above
1.6-4.8 kph
The specific draft and power
requirement for reaping/binding and
combining are ___, respectively.
a. 0.5-0.8 and 0.2-0.6 hp/ft
b. 1-3 hp/ton and 1-3 hp/ton
c. 1-2 and 2-4 kg/row
d. None of the above
1-2 and 2-4 kg/row
The grain-straw ratio requirement for
testing a rice thresher ranges from ___.
a. 0.35 to 0.50
b. 0.50 to 0.65
c. 0.65 to 0.80
d. All of the above
0.50 to 0.65
In terms of rasp bar rear clearance, the
recommended cylinder setting for rice is
___.
a. 3 – 6 mm
b. 10 – 18mm
c. 15 – 20 mm
d. None of the above
3 – 6 mm
The recommended rpm for the rice
thresher cylinder.
a. 400-600 rpm
b. 800-1200 rpm
c. 2000-3000 rpm
d. None of the above
800-1200 rpm
The power requirement of an axialflow rice thresher.
a. 25-hp diesel engine
b. 16-hp gasoline engine
c. 8-hp diesel engine
d. All of the above
16-hp gasoline engine
Based on the typical conventional rasp
bar cylinder settings for various crops, rice
has ___ peripheral speed.
a. 10 – 20 m/s
b. 20 – 30 m,s
c. 25 – 35 m/s
d. None of the above
20 – 30 m/s
The recommended front rasp bar
clearance for maize is ___.
a. 12 – 20 mm
b. 20 – 30 mm
c. 25 – 30 mm
d. None of the above
25 – 30 mm
The recommended size of scalper for
paddy is ___.
a. 0.2-0.25sq.m. per ton
b. 0.3-0.35sq.m. per ton
c. 0.4-0.45sq.m. per ton
d. None of the above
0.2-0.25sq.m. per ton
Efficiency of ordinary cyclone ranges
from ___.
a. 80 to 90%
b. 95 to 98%
c. 98 to 99%
d. None of the above
80 to 90%
The energy requirement of a
hammer mill in grinding shelled corn.
a. 7.4 kw-hr/ton
b. 5.8 kw-hr/ton
c. 2.3 kw-hr/ton
d. None of the above
7.4 kw-hr/ton
The operating speed of burr mills.
a. Less than 1200 rpm
b. 1200 to 2400 rpm
c. 2400 to 3200 rpm
d. None of the above
Less than 1200 rpm
The speed of hammer mills.
a. 200 to 1000 rpm
b. 1500 to 4000 rpm
c. 4500 to 6000 rpm
d. None of the above
1500 to 4000 rpm
The auger that is centrally located in
a vertical feed mixer and usually rotates
at ___ speed.
a. 100-250 rpm
b. 250-400 rpm
c. 400-650 rpm
d. None of the above
250-400 rpm
The ratio between the discharge
pressure to the suction pressure of a fan.
a. Pressure ratio
b. Head ratio
c. Specific ratio
d. None of the above
specific ratio
The specific ratio of fan.
a. Below to 1.11
b. 1.11 to 1.20
c. 1.20 and above
d. None of the above
Below to 1.11
The specific ratio of blower.
a. Below to 1.11
b. 1.11 to 1.20
c. 1.20 and above
d. None of the above
1.11 to 1.20
The specific ratio of compressor.
a. Below to 1.11
b. 1.11 to 1.20
c. 1.20 and above
d. None of the above
1.11 to 1.20
The actual horsepower requirement of
bucket elevators is ___ higher than the
theoretical value due to friction, power
transmission and drive losses.
a. 5 to 10%
b. 10 to 15%
c. 15 to 20%
d. None of the above
10 to 15%
Speed range of the head pulley of a
bucket elevator in a feed milling plant.
a. 40 to 70 rpm
b. 70 to 100 rpm
c. 100 to 250 rpm
d. None of the above
70 to 100 rpm
Carrying capacity of a single
bucket in a bucket elevator is usually
calculated by design engineers
considering a ___ of the rated
capacity.
a. 60 to 75%
b. 85 to 90%
c. 95 to 100%
d. None of the above
85 to 90%
The angle of inclination of belt
conveyors for conveying paddy and
most grains.
a. 9 to 12 degrees
b. 16 to 17 degrees
c. 20 to 24 degrees
d. None of the above
16 to 17 degrees
The standard screw pitch for
screw conveyors.
a. 1/2 of the diameter
b. 1 of the diameter
c. 1-1/2 of the diameter
d. None of the above
1 of the diameter
The trough angle for belt
conveyors used for paddy and grains.
a. 10 degrees
b. 20 degrees
c. 45 degrees
d. None of the above
20 deg