A3 - 1 Flashcards
some efficiencies, A3 from Tambong, IloIlo Exam 1
1
Q
min. req. for drying eff. for mechanical dryer
A
75%
2
Q
min. req. for heating eff. of direct-fired biomass-fueled grain dryer
A
65%
3
Q
min. req. for heat utilization eff. of direct-fired petroleum-based fuel for mechanical dryers
A
90%
4
Q
warranty period req. for mechanical grain dryers
A
6 mos
5
Q
Refrigerant: 150.3 BTU/lb; somewhat toxic; flammable
A
methyl chloride
6
Q
Refrigerant: 141.4 BTU/lb; very toxic but non-flammable
A
sulfur dioxide
7
Q
R-134a
A
tetraflouroethane
8
Q
monochlorodifluoromethane use as primary refrigerant for air conditioner
A
R-22
9
Q
inorganic refrigerant
A
R-717
10
Q
common refrigerant
A
freon
11
Q
Refrigerant: 89.4 Btu/lb; non-toxic and flammable
A
Freon 21
12
Q
Refrigerant: 51.1Btu/hr-ft-F: Non-toxic, non-flammable, Automobile: Household
A
freon 12
13
Q
refrigerant for air condition
A
freon 22
14
Q
tetraflouroethane
A
R-134a
15
Q
oldest and widely used for large installation: 475.5 BTU/lb;
highly toxic and flammable
A
ammonia
16
Q
unit for luminous flux
A
lumen
17
Q
chemical formula for ozone
A
O3
18
Q
quantity of light output by a source is measured in
A
lumen
19
Q
unit for illuminance
A
lux
20
Q
unit of magnetomotive force
A
Ampere-turn
21
Q
intensity of light per unit area
A
illumination
22
Q
quantity of electricity transported in one second by a current one ampere
A
coulomb
23
Q
unit for magnetic flux
A
weber
24
Q
unit for luminous intensity
A
candela
25
unit for flux density
tesla
26
most toxic refrigerant
ammonia
27
unit for luminous discharge
corona
28
rate of electrical power used or consumed
Watts
29
unit for electrical enrgy
kW or W
30
unit for generator
kW or W
31
unit for electrical energy
kWh
32
unit for current (I)
A
33
unit for true power (P)
W
34
unit for battery
Amp-hr
35
Unit for apparent power (S)
Volt-Amp (VA)
36
unit for alternating current (AC)
KVA
37
unit for reactive power (Q)
VAR, Volt-Amp-Reactive
38
unit for inductance (L)
henry (H)
39
unit for AC with capacitor
KVA
40
unit for admittance (Y)
siemens
41
unit for capacitance (C)
Farad (F)
42
unit for susceptance (S)
siemens
43
unit for resistance (R)
ohm
44
unit for conductance (G)
mho, siemens
45
unit for impedance (Z)
ohm
46
reciprocal of resistance
conductance
47
unit for resonance frequency
Hertz (Hz)
48
unit for quantity of electricity
Coulomb (C)
49
unit when specifying intensity of light needed for seeing
foot-candle
50
intensity of light at a point is measured in units of
foot-candle
51
amount of light flux density
footcandle
52
units for throw-in type thresher
peg tooth
53
power system that usees morethan 1 energy sources such as solar, wind, and biogas
hybrid
54
part of aerogenerators in wind farms that converts rotational movement to AC electricity
alternator
55
application of electricity in rural areas including the home, farm, and farmstead
rural electrification
56
current rating of AWG No. 10 wire
30 amp
57
standard size of drop wire (post to building wire) for farmhouses and households
5.5 mm2
58
how many mm is AWG No. 10 wire
5.5
59
solar irradiance at the earth's surface
1000 W/m2
60
solar irradiance multiplied by its duration is called
solar insulation
61
in the phil. and most SE asia, the daily solar energy or insulation is about
5 kWh/m2
62
normal freeboard percentage for water tanks and open channels
10-20%
63
shape of a concrete canal that needs more reinforcing bars at the lower part of its wall
circular
64
for class A mix, give the bags of 40-kg cement needed per m3 of concrete
9
65
what is the proper mix class for solid concrete open channel bed and walls
class A
66
what concrete canal cross-sectional shape has its sides serving as soil retaining wall
rectangular
67
the equivalent amount paid by the world bank for carbon emission reduction projects
carbon credit value
68
best type of biogas plant for large animal farms having effluents with low volatile solids
covered lagoon
69
plastic sheet for constructing balloon and bed lining in covered lagoon biogas plant
high density polythylene (HDPE)
70
by hoe many times is methane destructive to the environment than carbon dioxide
21 times
71
flammable gas derived from anaerobic fermentation of any organic matter especially animal manure or manure-biomass mixture
biogas
72
estimated proportion of methane in biogas for digesters using 1:1 water-manure ratio
60%
73
water and manure mixture
slurry
74
color of biogas flame during daytime in outdoor areas
colorless
75
estimated proportion of carbon dioxide in biogas for digesters using 1:1 water-manure ratio
40%
76
estimated biogas produced per kg cow manure for 25-day hydraulic retention time
0.03 m3/kg
77
recommended manure-water ratio by volume for economical biogas production
1:1
78
the metal-corrosive component of biogas in small amount which smells like a rotten egg
hydrogen sulfide
79
modes of heat transfer where the transmission occurs through substance from molecule to molecule
conduction
80
heating value of coco shell
17,800 kJ/kg
81
it embodies the first agricultural engineering law in the phil
RA 3927
82
amount of heat needed to increase or decrease 1 lb of water to 1 F
specific heat
83
agent conduct heat from refrigerated coils and release outside air
refrigerant
84
contract in which the agreement of parties is inferred from their conduct
implied contract
85
basil electrical element which prevents the current from changing instantly
inductor
86
instrument simplest and reliable difference of fluid height in the tube
manometer
87
main cause of air pollution as a result of combustion of fuel
carbon dioxide
88
amount of heat added or removed to cause change of state without changing temperature
latent heat
89
standard gross heating value of gasoline
17,320 kJ/kg
90
agricultural engineering permit is an ancillary permit supplementary to building permit to be signed and sealed by a registered agricultural engineer. the documents to be signed include the ff except for:
1. farm products packing house
2. hatcheries
3. dams and spillways
4. slaughter house
3. dams and spillways
91
when resistance of a certain circuit is zero or almost zero, the circuit is called
shorted
92
heating value of rice hull
14,000 kJ/kg
93
amount of heat added or removed measured in change of temperature without changing state
sensible heat
94
amount of heat needed to increase/raise 1lb of substance to 1F
specific heat
95
metal particles blown away from the welding arc
splatter
96
states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance and directly proportional to the resistance of the circuit
ohm's law
97
based on the 2009 phil. electrical code, what is the minimum conductor size in mm2 for a voltage rating of 0-2000 V when using copper wire
2 mm2
98
aa farmhouse requires a minimum conductor size of 2 mm2 which is equivalent to AWG #
AWG # 14
99
AWG # _____ should not be used in houses, except for drop wires
AWG # 16
100
common household wires
AWG # 10, 12, 14
101
AWG # 14 has ______ conductor size
2.08 mm2
102
which electrical wire has the biggest cross-sectional area
1. AWG 16
2. AWG 14
3. AWG 8
4. AWG 6
4. AWG 6
103
which type of wire has the maximum operating temperature of 90 deg
1. THW
2. RHW
3. THHN
4. THWN
3. THHN
104
based on the phil. electrical code, what is the minimum conductor size in mm2 for a voltage rating of 2001 - 8000 V when using copper, aluminum, or copper-clad aluminum wire?
8
105
if V is voltage, I is current, and P is power, according to ohm's law, V is equal to
V = IR
106
ohm's law is applicable to
both AC and DC
107
ohm's law applies to both AC and DC circuits as long as mutual _____ of the circuit is considered
inductance
108
the resistivity of annealed copper in ohm meter at 20 deg C
1.72 x 10^ -8
109
the resistance of a certain length of wire can be obtained by multiplying its _____ with its length and dividing the resulting product by the cross-sectional area of the wire
resistivity
110
in connecting electricity from a post to a farmhouse, a ____ wire is needed
drop wire
111
minimum wire size for a farmhouse drop wire
AWG 6
112
a solar powered slaughterhouse uses electrical stunning gun to make the animals insensible to pain before the slaughter. what should be the voltage of the stunning pen?
220 Vac
113
based on PAES 419:2000, the recommended lighting intensity in lux (lumen/mm2) for fruit and vegetable processing plant are:
100 for outside bldg
200 for general indoor locations, &
___ for working tables
500
114
a poultry layer area requires a brightness of 1600 lumens. what is the wattage of a day-light color LED bulb that shall be used
100W daylight-color LED
115
in off-grid farmhouse electrification, which one has the lowest operation and maintenance cost
solar home system
116
highest operation and maintenance
diesel generator
117
in off-grid brgy electrification located 3 km from electricity grid, what is recommended
grid extension
118
what electricity source has the highest gas emission
diesel generator
119
a 950-kW cassava flour processing plant is to be powered using hydro. what electricity source shall be utilized
minihydro
120
the resistance of a human body varies from about
______ when dry, and about
______ when wet
500,000 ohms
300 ohms
121
hydropower: large scale
> 100 MW
122
hydropower: medium scale
10 MW - 100 MW
123
hydropower: small scale
< 10 MW
124
hydropower: small scale: small
1 MW - 10 MW
125
hydropower: small scale: mini
100 kW - 1 MW
126
hydropower: small scale: micro
5 kW - 100 kW
127
hydropower: small scale: pico
<5 kW
128
the board used in Arduino open-source electronics platform based on easy-to-use hardware and software which is able to read inputs like light on a sensor, temperature reading, a finger on a button, or a twitter message and can turn these inputs into outputs like activating a motor, turning on a LED, turning on a solenoid valve, or publishing something online
microcontroller
129
an arduino microcontroller is used to activate mist sprinkler system for 10 min every time the greenhouse temperature rises above a certain level. what device is best turned on by the microcontroller to start the mist sprinklers?
solenoid valve
130
the name given to arduino code files which serve as instructions to the microcontroller
sketch
131
part of solar module needed such that solar charging is continuous at slower rate when partially shaded by trees
bypass diode
132
a diode needed as protection against lighting in solar installation
blocking diode
133
the common pin, made as the pair to other pins, integrated circuits (IC)
ground
134
an integrated circuit (IC) included as an important part of electronic instrumentation for gathering speed and discharge real-time data
timer
135
integrated circuit (IC) used in instumentation and control
LM 333
136
voltage appropriate in remote instrumentation
5, 7, and 9 Vdc
137
data transmission to a remote, unelectrified, and line-of-sight point is the best done through _____
radio frequency
138
in automatic control of irrigation dam gates, what switch is useful in the instrumentation?
automation transfer switch
139
switch for automatic pump motor control of sealed water tanks in drip irrigation systems
pressure switch
140
under PAES 418:2002, washing of tomato is done by using ___ chlorox solution applied by dipping, spraying, with a damp cloth then drying the fruit before packing
1%
141
based on PAES 419:2000, the recommended optimum stack height in meters for storage of both paddy and rice grains
4.27 m
142
what standard shall be followed in constructing large-scale poultry dressing/s slaughtering plants?
PAES 422-2:2012
143
based on PAES 419:2000, the recommended optimum stack height for storage of wheat, barley, and maize grains
4.57m
144
PAES 419:2000 requires the food grains stored in a warehouse for bagged storage area in the range of 12% to ____ moisture content prior to storing
14%
145
the phil. standard for grading and classification of paddy and milled rice grains
PNS/BAFS 290:2019
146
the phil. standard for code of practice and postproduction of organic milled rice
PNS 42:2019
147
the phil. standard for maximum residue limits (MRLs) of pesticides in rice
PNS 162:2015
148
the phil. general standard for contaminants and toxins in food and feed
PNS 194:2017
149
industrial bottling of virgin coconut oil prints a batch number. what is the main purpose of this batch number?
product recall
150
a feed mixer tested to have mixing coefficient of variation of 10% - 15% is rated as ____
good
151
as a standard, stripping efficiency of the mechanized stripping machine shall be at least
80%
152
as prescribed is PAES 419:2000, in constructing walls of a warehouse for bagged storage of grains, the wall should use _____mm thick concrete hollow blocks with 12 mm diameter reinforcing bars at horizontal and vertical spacing of 600 mm
150 mm
153
known as the national building code of the phil
PD 1096
154
type of building that is made of steel, iron, concrete, or masonry construction
type IV
155
type of building that shall be of masonry and wood construction
type III
156
type of building that shall be four-hour fire-resistive throughout and the structural elements shall be of steel, iron, concrete, or masonry construction
type V
157
type of building that is made of wood construction with protective fire-resistant materials and one-hour fire-resistive throughout
type II
158
type of building that is made of wood construction. the structural elements may be any of the materials permitted by the code
type I
159
PAES 419:2000 requires that a normal-temperature warehouse intended for storage of bagged grains shall have a minimum interior height between the beam and floor of ___ meters
6m
160
under PAES 4218:2002, in constructing a primary processing plant for fresh fruit and vegetable, the windowsill shall be at least ____m from the finished floor line
1m
161
under PAES 418:2002, in constructing a primary processing plant for fresh fruit and vegetable, the doors shall have a minimum width of _____
1.5 m
162
habitable rooms provided with artificial ventilation shall have ceiling heights of not less than ___m measured from the floor to the ceiling (PD 1096)
2.4 m
163
smallest dimension in cm of concrete hollow blocks in the phil.
10 x 20 x 40
164
for buildings of more than 1-storey, the minimum ceiling height of the first-storey shall be ___m and that for the second-storey 2.40 meters and succeeding storeys shall have an unobstructed typical head-room clearance of not less than 2.10 meters above the finished
2.7 meters
165
all buildings located in a reas where there is no sanitary sewerage system shall dispose their sewage to imhoff tank or ______ and subsurface absorption field (PS 1096)
septic tank
166
a tank for sewage consisting of an upper or sedimentation chamber with sloping floor leading to slots through which the solids settle to the lower sludge-digestion chamber
imhoff tank
167
based on the building code, when excavating near adjoining buildings the owners of adjoining buildings shall be notified in writing at least how many days before excavation?
10 days
168
as provided in the building code, when occuring concrete made from ordinary portland cement, the concrete be maintained above 10 deg C and in moist condition for the first how many days at least?
7 days
169
when curing concrete made from high strength portland cement, what is the minimum curing time in days as provided in the building code
3 days
170
what percentage of concret strength is reached at the end of the first week
70%
171
the initial setting of concrete starts in the first how many hours after concrete mixing?
2-3 hours
172
when using 0.75 inch nominal maximum size of coarse aggregate, what is the estimate percentage of air content by volume in concrete?
4-8 %
173
when made of normal weight aggregate, what should be the maximum water-cement ratio of concrete that is intended to be watertight when exposed to fresh water?
0.48
174
for concrete agricultural structure made from normal weight aggregate and in contact with sea water, what should be the maximum water-cement ratio for it to be watertight?
0.44
175
the cross-sectional area in mm of standard 16 mm diameter reinforcing bar
113.1 mm2
176
in a wall footing, the horizontal steel reinforcing is said to be normally adequate if steel cross-sectional area relative to concrete cross-sectional area is ___
0.2% - 0.3%
177
what is the least number of longitudinal bars in a tied concrete column
4
178
what is the maximum diameter of longitudinal bars in a tied concrete column
16 mm
179
based on ACI code, what is the minimum diameter of lateral ties in a tied concrete column for 32 mm or smaller longitudinal bars?
10 mm
180
based on ACI code, what is the minimum diameter of lateral ties in a tied concrete column for 36 to 57 mm and bundled longitudinal bars
12 mm
181
based on ACI code, the maximum spacing of lateral ties in a tied concrete column should not be more than ____ times the diameter of the longitudinal bars
16 times
182
based on ACI code, the maximum spacing lateral tie in a tied concrete column should not be more than ___ times the diameter of the lateral ties
48 times
183
if an additional resistance is added to a series RL circuit, the overall power factor of the circuit will ______
increase
184
For the same illumination, what lamp has lower wattage and power consumption?
LED
185
In photovoltaic systems, what is the component used to regulate the main electricity flow?
Battery Control Unit
186
What is the standard system voltage for solar home systems?
12 V
187
Name the electrical device used to transform DC to AC electricity.
converter
188
In biogas-fired electricity generators, what is device used in tandem with the generator for efficient burning of excess biogas to reduce greenhouse gas emission?
Flare
189
