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PART III-A > 3-MSU > Flashcards

3-MSU Flashcards

1
Q

Based on PAES 220, what shall be the minimum purity of output of a peanut sheller with blower?

a. 80%
b. 85%
c. 90%
d. 95%
e. 98%

A

d. 95%

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2
Q

Swine housing system where the sows and piglets remain in the farrowing house until the
piglets are weaned. The weanlings are transferred to a growing-finishing house.

a. One-unit system
b. Two-unit system
c. Three-unit system
d. Four-unit system
e. Five-unit system

A

b. Two-unit system

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3
Q

The minimum requirements for causing flow of current are:

a. A voltage source, a resistor, and a switch
b. A voltage source and a conductor
c. A power source and a bulb
d. A voltage source, a conductor, an ammeter, and a switch
e. None of the above

A

b. A voltage source and a conductor

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4
Q

A barangay road 6.00 meters wide and 1.5 kilometers long after base preparation requires
concreting. Find the number of bags of cement required using class “A” concrete if the slab is
designed 6 inches thick.

a. 12,150
b. 8,230
c. 10,680
d. 13,550
e. 15,660

A

a. 12,150

Vroad = (L)(W)(t)

where: L = 1.5km = 1,500m

W = 6m
t = 6in = 0.15m
Vroad = = (1,500m) (6m) (0.15m) = 1,350 cu.m.
Using Class A mixture,
Number of bags of cement = (9.0 bags/cu.m.) (1,350 cu.m.)
n = 12,150

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5
Q

What is the appropriate color of packaging material for special rice?

a. Sky blue
b. White
c. Light yellow
d. Green
e. Any color

A

a. Sky blue

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6
Q

More carbon content in a steel composition means:

a. More brittle but weaker
b. More ductile but stronger
c. More brittle but stronger
d. More ductile but weaker
e. More brittle and ductile

A

c. More brittle but stronger

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7
Q

A wind turbine is constructed to provide a certain house an electrical power of around 100W.
If the location has an estimated air speed of 8m/sec, what should be the length of the rotor?
Assume system efficiency of 19.5% and air density of 1.34 kg/m3

a. 1.24m
b. 1.38m
c. 1.85m
d. 2.50m
e. 3.25m

A

b. 1.38m

Power of the turbine:
Pturbine = (eff)(Pwind)
100 watts = (0.195)(Pwind)
Pwind = 512.82W
Rotor swept area:
Pwind= ρ×A×v3
/2
512.82W = (1.34 kg/m3

)(A)(8 m/s)3
/2

A = 1.4949 m2
Diameter (length of the rotor):
A= π(D/2)2
1.4949 m2 = (3.14)(D/2)2
D = 1.38m

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8
Q

In the fluidized bed dryer, the resistance of grain bed to airflow is dependent upon the
following factors, except:

a. Bed thickness
b. Coefficient of friction
c. Air velocity
d. Orientation of the grains
e. Type of grains

A

b. Coefficient of friction

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9
Q

A restaurant countertop bar has three appliances connected to a 220-V circuit with a 10-A
circuit breaker. These appliances are: 1000-W mini hot-cold water dispenser, 1350-W
microwave oven, and 900-W toaster. Which of these appliances can be operated
simultaneously without tripping the circuit breaker?

a. Water dispenser and oven
b. Oven and toaster
c. Water dispenser and toaster
d. All three appliances
e. None of the appliances

A

c. Water dispenser and toaster

Compute for the total amperage.
From P = IV, I = P/V
Dispenser + Oven = 1000 + 1350 = 2,350W I = 2,350W/220V = 10.68A
Dispenser + Toaster = 1000 + 900 = 1,900W I = 1,900W/220V = 8.64A <10A
Oven + Toaster = 1350 + 900 = 2,250W I = 2,250W/220V = 10.23A
All three = 1000 + 1350 + 900 = 3,250W I = 3,250W/220V = 14.77A

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10
Q

Based on PAES 216, the noise emitted by the hammer mill shall not be more than ____ db.

a. 92
b. 96
c. 100
d. 105
e. 110

A

b. 96

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11
Q

In the flow chart, this symbol is the terminator and is used to represent the start and end of a process.

a. Oval
b. Square
c. Parallelogram
d. Diamond
e. Inverted triangle

A

a. Oval

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12
Q

For the layer housing, what is the minimum space requirement for birds in cages?

a. 2.5 m2/100 birds
b. 4.0 m2/100 birds
c. 5.0 m2/100 birds
d. 6.5 m2/100 birds
e. 7.0 m2/100 birds

A

c. 5.0 m2/100 birds

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13
Q

A steel bar 50mm in diameter and 2m long is surrounded by a shell of cast iron 5mm thick.
Compute the load that will compress the bar a total of 1mm in the length of 2m. Use Esteel =200GPa and Ecast.iron = 100 GPa.

a. 200kN
b. 240kN
c. 280kN
d. 320kN
e. 360kN

A

b. 240kN

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14
Q

A cutting tool known as “katam”

a. Saw
b. Planer
c. Chisel
d. Shears
e. Axe

A

b. Planer

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15
Q

An electric motor has a nameplate rating of 1.25 horsepower, 220 volts, and 10.0 amperes. Calculate the motor efficiency assuming a motor power factor of 0.5.

a. 0.85
b. 0.80
c. 0.75
d. 0.70
e. 0.90

A

a. 0.85

POWER FACTOR= MOTOR POWER/POWER INPUT

0.5=MOTOR POWER/(220 V X 10 A)
Motor Power= 1100 W

Motor Efficiency= rating/motor power
= (1.25 hp)(746 w/1 hp)/1100W
motor effficiency= 0.85

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16
Q

Rice with 80% or more of whole milled rice kernels having a length of 6.4 to 7.4 mm.

a. Very short
b. Short
c. Medium
d. Long
e. Very long

A

d. Long

17
Q

A concrete column is 7.00 meters high with a cross-sectional dimension of 20x24 inches.
Determine the quantity of sand if there are 8 columns in the row using class “A” concrete.

a. 8.4 cu.m.
b. 7.2 cu.m.
c. 12.5 cu.m.
d. 18.4 cu.m.
e. 16.8 cu.m.

A

a. 8.4 cu.m.

Vcolumn = (h)(w1)(w2) h = 7.00m
w1 = 20in = 0.50m
w1 = 24in = 0.60m

Vcolumn = (7.00m)(0.50m)(0.60m)
Vcolumn = 2.10m3
For the eight columns: Vcolumn = (8)(2.10m3
) = 16.8m3

Quantity of sand = (0.50m3
/m3
)(16.8m3
)

Quantity of sand = 8.4m3

18
Q

Which of the following describes the minimum fiber quality extracted from pineapple?

a. The fiber is almost free from scales, epidermal layers and pulps.
b. The color ranges from light straw or light greenish to light yellowish ivory.
c. The fiber shall be free from any shade of purple, red, and greenish streaks.
d. It is completely free from bark, sticks, or foreign matter.
e. Any of the above

A

a. The fiber is almost free from scales, epidermal layers and pulps

19
Q

Estimate the daily biogas production rate of a biogas plant with the following specifications
and utilization:
Number of swine (36-55 kg): 50
Manure production per head: 5.22 kg/day
Gas production per 1 kg of manure: 0.058 m3
Retention time: 30 days

a. 261 m3/day
b. 5.1338 m3/day
c. 58.313 m3/day
d. 15.138 m3/day
e. 54.322 m3/day

A

d. 15.138 m3/day

Manure production = (50 heads)(5.22 kg/day per head) = 261 kg/day
Biogas production rate = (261 kg/day)(0.058 m3/day) = 15.138 m3/day

20
Q

Part of the vapor compression system that meters the amount of liquid refrigerant entering
the evaporator.

a. Compressor
b. Suction line
c. Liquid line
d. Back pressure valve
e. Discharge line

A

d. Back pressure valve

21
Q

If the floor of the cattle feedlot is earth lot, it shall have a slope of:
a. 2-4%
b. 3-6%
c. 4-7%
d. 5-8%
e. 6-9%

A

c. 4-7%

22
Q

Heat transfer take place according to which of the following law?
a. First law of thermodynamics
b. Second law of thermodynamics
c. Zeroeth law of thermodynamics
d. Newton’s law of cooling
e. Newton’s second law of motion

A

b. Second law of thermodynamics

23
Q

Pure metals generally have:

a. High conductivity and low temperature coefficient
b. High conductivity and large temperature coefficient
c. Low conductivity and zero temperature coefficient
d. Low conductivity and high temperature coefficient
e. High conductivity only

A

b. High conductivity and large temperature coefficient

24
Q

It refers to adding or introducing anaerobic bacteria to the digester.

a. Seeding
b. Scum
c. Backfilling
d. Priming
e. Loading

A

a. Seeding

25
Q

How much energy is required to heat 100 cfm of air at 25^0F DB and 20^0F WB to 70^0F DB and 50^0F WB? Take specific volume of dry air at initial condition as 12.25 ft3/ lb. Enthalpy at initial condition is h1 = 7.1 Btu/lb, while at the final condition, it is 20.22 Btu/lb.

a. 6,126.42 Btu/hr
b. 4,261.26 Btu/hr
c. 1,264.26 Btu/hr
d. 6,426.12 Btu/hr
e. 2,612.64 Btu/hr

A

d. 6,426.12 Btu/hr
Q = m(Δh)

At: DB1 = 25^0F WB1 = 20^0F h1 = 7.1 Btu/lbda
At: DB2 = 70^0F WB1 = 50^0F h2 = 20.22 Btu/lbda

Mda=pV=V/v=100/12.25=8.16

Q = m(Δh) = (8.16 lbda/min) (20.22 – 7.1 Btu/lbda) (60min/ 1hr)
Q = 6,426.12 Btu/hr

26
Q

A fuse protects an electric circuit by which of the following?

a. Overloading
b. Transforming one form of energy into another
c. Current sport
d. Current uptake
e. All of the above

A

a. Overloading

27
Q

Which condition is not desirable for biogas production?

a. C:N ratio of around 30:1
b. Absence of oxygen
c. Acidic condition
d. Stirring
e. Thermophilic condition

A

c. Acidic condition

28
Q

In testing the biomass furnace, the required maximum moisture content of corn cobs used as
biomass fuel shall be:

a. 5%
b. 7%
c. 10%
d. 13%
e. 15%

A

c. 10%

29
Q
A

PART III-A (6 decks)

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