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
For grains, the air conveying
capacity required for pneumatic
conveyor is ___.
a. 15 to 50 ft3
/lb
b. 55 to 100 ft3/lb
c. 105 to 250 ft3
/lb
d. None of the above
15 to 50 ft3
/lb
The static pressure for fan design
in a pneumatic conveyor system is
___ times of the air pressure
requirement.
a. 1.2 to 1.3
b. 2.2 to 2.3
c. 3.2 to 3.3
d. None of the above
1.2 to 1.3
The design grain-to-air weight ratio
for pneumatic conveyor is ___.
a. 1:1.2 to 1:3.7
b. 1:3.8 to 1:4.5
c. 1:4.6 to 1:5.5
d. None of the above
1:1.2 to 1:3.7
The recommended depth of grains
in a shallow-bed dryer.
a. Up to 12 inches
b. Up to 18 inches
c. Up to 24 inches
d. All of the above
Up to 18 inches
The approximate airflow for large
recirculating-bin dryer.
a. 23-50 m3/min-ton
b. 60-80 m3
/min-ton
c. 70-100 m3
/min-ton
d. None of the above
70-100 m3
/min-ton
The approximate airflow for small
continuous-flow dryer.
a. 85-115 m3
/min-ton
b. 70-100 m3
/min-ton
c. 60-80 m3
/min-ton
d. None of the above
85-115 m3
/min-ton
The bulk density of rice and ear corn
is ___, respectively.
a. 26 and 28 lb/ft3
b. 36 and 28 lb/ft3
c. 38 and 48 lb/ft3
d. None of the above
36 and 28 lb/ft3
The bulk density of peanut and
soybean is ___, respectively.
a. 14-17 and 48 lb/ft3
b. 19-26 and 48 lb/ft3
c. 26-45 and 45 lb/ft3
d. None of the above
14-17 and 48 lb/ft3
The minimum drying efficiency
requirement based on the standard
performance criteria for mechanical dryers.
a. 90%
b. 75%
c. 50%
d. None of the above
75%
The minimum heating efficiency
requirement for a direct-fired biomassfueled grain dryer.
a. 75%
b. 65%
c. 50%
d. None of the above
65%
Power requirement of a 6-ton flat-bed
dryer.
a. 7-hp electric motor
b. 5-hp electric motor
c. 3-hp electric motor
d. None of the above
5 hp em
The suggested drying temperature for
paddy for seeds is ___.
a. 45°C
b. 50°C
c. 66°C
d. None of the above
45°C
The suggested drying temperature for
corn with over 25% moisture content
intended for seed is ___.
a. 60°-70°C
b. 43°-50°C
c. 32°-43°C
d. none of the above
32°-43°C
The suggested drying temperature for
commercial corn intended for wet milling is
___.
a. 43°-50°C
b. 55°-57°C
c. 60°-70°C
d. None of the above
55°-57°C
The minimum heat utilization
efficiency requirement for a direct-fired
petroleum-based fuel mechanical dryer,
based on the standard performance
criteria .
a. 90%
b. 80%
c. 70%
d. None of the above
90%
The suggested drying temperature for
sliced fruits as well as for split and whole
fish is ___, respectively.
a. 43°-50°C and 60°-70°C
b. 55°-57°C and 60°-70°C
c. 60°-70°C and 60°-70°C
d. None of the above
60°-70°C and 60°-70°C
The recommended drying rate for a
re-circulating dryer is ___.
a. 1-2% per hour
b. 2-3% per hour
c. 3-4% per hour
d. None of the above
1-2% per hour
The recommended drying rate for a
conduction-type rotary dryer is ___.
a. up to 8% per pass
b. up to 10% per pass
c. up to 15% per pass
d. None of the above
up to 10% per pass
A conventional 6-ton capacity flatbed
dryer basically consists of ___ sheets of
1.2 m x 2.4 m perforated sheets as drying
floor.
a. 5
b. 7
c. 9
d. None of the above
9
Typical fuel consumption rate of a 12-
hp diesel engine used in a 6-ton flatbed
dryer.
a. 0.9 liter per hour
b. 1.0 liter per hour
c. 1.2 liters per hour
d. None of the above
1.2 liters per hour
Minimum drying efficiency required
for heated-air mechanical grain dryers.
a. 50%
b. 75%
c. 95%
d. All of the above
75%
Minimum heating system efficiency
for direct-fired petroleum-based heatedair mechanical dryers.
a. 70%
b. 80%
c. 90%
d. All of the above
90%
Minimum heating system efficiency
for indirect-fired biomass-fuelled heatedair mechanical dryers.
a. 50%
b. 60%
c. 70%
d. All of the above
50%
Typical size of engine used in a 6-ton
flatbed dryer in the Philippines.
a. 10 hp diesel engine
b. 12 hp diesel engine
c. 14 hp diesel engine
d. None of the above
12 hp diesel engine
Typical fuel consumption rate of a 12-
hp diesel engine used in a 6-ton flatbed
dryer.
a. 0.9 liter per hour
b. 1.0 liter per hour
c. 1.2 liters per hour
d. None of the above
1.2 liters per hour
Overall size of an electric motor used
for a 6ton-capacity recirculating- type
paddy dryer in the Philippines.
a. 8 kW
b. 10 kW
c. 12 kW
d. None of the above
8 kW
Power consumption of a 10-kW
electric motor in drying 6 tons of
paddy in a recirculating-type paddy
dryer.
a. 11.6 to 15.0 kW-hour/ton
b. 15.1 to 19.0 kW-hour/ton
c. 19.1 to 24.0 kW-hour/ton
d. None of the above
11.6 to 15.0 kW-hour/ton
The minimum hulling efficiency
requirement for rice mills based on
standard performance criterion.
a. 90%
b. 80%
c. 70%
d. None of the above
90%
The maximum percentage of
milling recovery from rice mills.
a. 69%
b. 75%
c. 80%
d. None of the above
69%
The husking ratio of a rubber-roll
huller is about ___.
a. 60-70 %
b. 80-90 %
c. 95-98 %
d. None of the above
80-90 %
The recommended peripheral
speed for rubber huller is ___.
a. 12 m/s
b. 14 m/s
c. 16 m/s
d. None of the above
14 m/s
In a rubber-roll husker, one roll
moves slower than the other by ___.
a. 25%
b. 50%
c. 75%
d. None of the above
25%
The recommended peripheral
speed for disk huller is 14 m/s at a
clearance of ___ the thickness of
paddy.
a. ¼
b. ½
c. ¾
d. None of the above
½
The manufacturer’s prescribed
peripheral velocity of a disk huller is
___.
a. 10m/s
b. 14m/s
c. 18m/s
d. None of the above
14m/s
The capacity of a compartmenttype separator is ___.
a. 20-30kg. brown rice per hour
b. 40-60kg. brown rice per hour
c. 70-80kg. brown rice per hour
d. None of the above
40-60kg. brown rice per hour
The trays in the tray-type paddy
separator are all attached to an
oscillating frame about ___ apart.
a. 5 cm
b. 10 cm
c. 15 cm
d. None of the above
5 cm
The clearance between the cone
of a vertical-abrasive whitener is
adjusted at ___ by raising and lowering
the cone.
a. 10 mm
b. 20 mm
c. 30 mm
d. None of the above
10 mm
The normal setting speed of a
horizontal-abrasive whitener.
a. 800 rpm
b. 1000 rpm
c. 1200 rpm
d. None of the above
1000 rpm
adjustment clearance for rubber brakes
in a vertical-abrasive whitening cone is ___
from cone coating.
a. 1 to 2 mm
b. 2 to 3 mm
c. 3 to 4 mm
d. None of the above
2 to 3 mm
The maximum speed requirement for a
vertical-abrasive whitening cone machine.
a. 13 m/s
b. 14 m/s
c. 15 m/s
d. All of the above
13 m/s
The overall system efficiency of the
water pump with new electric motor as
drive is ___.
a. 60%
b. 80%
c. 95%
d. None of the above
95%
The water requirement of corn is ___.
a. 3.75 mm/day
b. 5.33 mm/day
c. 6.15 mm/day
d. None of the above
6.15 mm/day
The water requirement of cabbage is
___.
a. 3.75 mm/day
b. 4.35 mm/day
c. 5.33 mm/day
d. None of the above
3.75 mm/day
The daily water requirement of a
minimum household-size averages at ___.
a. 0.068 m3/day
b. 0.045 m3
/day
c. 0.567 m3
/day
d. None of the above
0.567 m3
/day
The water requirement of mungbean
and soybean is ___, respectively.
a. 4.76 and 4.35 mm/day
b. 5.33 and 5.23 mm/day
c. 6.15 and 6.00 mm/day
d. None of the above
5.33 and 5.23 mm/day
The daily water requirement of each
milk-producing and dry cow is ___,
respectively.
a. 0.151 and 0.045 m3
/day
b. 0.151 and 0.023 m3
/day
c. 0.151 and 0.008 m3/day
d. None of the above
0.151 and 0.045 m3
/day
Fuel consumption rate of diesel
engine in pumping water for STW pump.
a. 0.4 to 0.8 liter per hour
b. 0.8 to 1 liter per hour
c. 1.0 to 1.2 liter per hour
d. None of the above
0.8 to 1 liter per hour
Fuel consumption rate of diesel
engine in pumping water for STW pump.
a. 0.4 to 0.8 liter per hour
b. 0.8 to 1 liter per hour
c. 1.0 to 1.2 liter per hour
d. None of the above
0.8 to 1 liter per hour
The size of a diesel engine commonly
used for 4-in. STW pump.
a. 8 hp
b. 12 hp
c. 16 hp
d. None of the above
8 hp
Throughput capacity of an STW
pump in rice irrigation.
a. 5 lps for 24 hours per ha
b. 10 lps for 24 hours per ha
c. 15 lps for 24 hours per ha
d. None of the above
10 lps for 24 hours per ha
The transmission ratio of a power
tiller ranges from___.
a. 1:2 to 1:4
b. 1:7 to 1:10
c. 1:12 to 1:16
d. All of the above
1:12 to 1:16
The optimum axle speed for
puddling-type floating tiller.
a. 100 rpm
b. 250 rpm
c. 340 rpm
d. None of the above
250 rpm
The standard length-of-stroke of
hydraulic remote-controlled cylinders for
trailing-type agricultural implement is
___.
a. 6 to 12 inches
b. 8 to 16 inches
c. 10 to 20 inches
d. None of the above
8 to 16 inches
The recommended minimum width,
length and thickness of an axle hub for
Type-1 walking-type agricultural tractor.
a. 27 mm W x 150 mm L x 3 mm T
b. 34 mm W x 150 mm L x 5 mm T
c. 45 mm W x 150 mm L x 7 mm T
d. None of the above
27 mm W x 150 mm L x 3 mm T
The recommended minimum width
and length of an axle hub for Type-2
walking-type agricultural tractor.
a. 27 mm W x 150 mm L x 3 mm T
b. 34 mm W x 150 mm L x 5 mm T
c. 45 mm W x 150 mm L x 7 mm T
d. None of the above
34 mm W x 150 mm L x 5 mm T
The recommended dimension for a
hexagonal axle for Type-1 walking-type
agricultural tractor.
a. 25mm W x 500 mm L
b. 32 mm W x 500 mm L
c. 43 mm W x 500 mm L
d. None of the above
25mm W x 500 mm L
The recommended dimension for a
hexagonal-axle for Type-2 walking-type
agricultural tractor.
a. 25mm W x 500 mm L
b. 32 mm W x 500 mm L
c. 43 mm W x 500 mm L
d. None of the above
32 mm W x 500 mm L
The maximum allowable width
and length of the platform for
agricultural trailer which is attached
to a four-wheel tractor.
a. 1.7 m W by 2.0 m L
b. 2.0 m W by 4.0 m L
c. 2.5 m W by 6.0 m L
d. None of the abov
2.5 m W by 6.0 m L
The minimum thrust per
drawbar horsepower of a hydraulic
remote-controlled cylinder for a
trailing-type agricultural
implements.
a. 68 kg
b. 78 kg
c. 88 kg
d. None of the above
68 kg
The maximum allowable width
and length of the platform for
agricultural trailer which is attached
to a two-wheel tractor.
a. 1.7 m W by 2.0 m L
b. 2.0 m W by 4.0 m L
c. 2.5 m W by 6.0 m L
d. None of the above
1.7 m W by 2.0 m L
The maximum tire inflation
pressure for agricultural
implements.
a. 40 psi
b. 60 psi
c. 100 psi
d. None of the above
60 psi
When the power transmitted
ranges from 0.764 to 18.64 kW, the
recommended type of single v-belt
is _____.
a. Type A
b. Type B
c. Type
d. None of the above
Type B
Required deep of tilling rice paddy soil.
a. 10 to 15 cm
b. 15 to 20 cm
c. 20 to 25 cm
d. All of the above
e. None of the above
20 to 25 cm
