119-126 Flashcards
(165 cards)
1
Q
Water flows at 0.50 m/s through a 20mm tube lined with β-ethanol. What is the mass transfer coefficient if the Schimdt number is 2330?
A. 1.1E-5 m/s
B. 1.1E-6 m/s
C. 5e-5 m/s
D. 3.5E-6 m/s
A
C. 5e-5 m/s
2
Q
A wetted column 2-in in I.D. contains air and CO2 flowing at 3ft/sec. At one point in the column, the CO2 concentration in the air is 0.1 mole
fraction. At the same point in the column, the concentration of CO2 in the water at the air-water interface is 0.005 mole fraction. The column
operated at 10 atm and 25°C. Calculate the mass transfer coefficient in ft3/hr.
A. 20
B. 40
C. 80
D. 10
A
D. 100
3
Q
A wetted column 2-in in I.D. contains air and CO2 flowing at 3ft/sec. At one point in the column, the CO2 concentration in the air is 0.1
mole fraction. At the same point in the column, the concentration of CO2 in the water at the air-water interface is 0.005 mole fraction. The
column operated at 10 atm and 25°C. Calculate the mass flux at this point of consideration in lbmoles/dr-ft2.
A. 120.4
B. 0.005
C. 1.84
D. 20.5
A
C. 1.84
4
Q
100 m3/hr of air at 60°C and 20% RH is needed for a chemical reactor. This will be obtained from a process air at 60°C and 10%RH by
humidifying adiabatically the process air followed by heating to its original temperature. The wattage of the heater at 80% efficiency is
A. 5280
B. 8490
C. 10050
D. 11570
A
D. 11570
5
Q
If the decomposition of N2O5 into N2O4 and O2 were to proceed to completion in a closed volume of size V. what would be the percent
increase in pressure if the starting composition is 50 percent N2O5 and 50% N2?
A. 25%
B. 20%
C. 15%
D.10%
A
A. 25%
6
Q
The natural abundance of U-235 in uranium is 0.79 atom %. If a sample is enriched to 3 atom% and then is stored in salt mines under the
ground, how long will it take the sample to reach the natural abundance level of U-235 (assuming no other processes for U-235; this is not
the case if U-238 is present since it can decay to form U-235)? The half-life of U-235 is 7.13E
8 years.
A. 1.4E9 yrs
B. 1.4E8 yrs
C. 1.4E7 yrs
D. 1.4E6 yrs
A
A. 1.4E9 yrs
7
Q
The turbine of a jet engine operates adiabatically and receives a steady flow of gases at 114 psia. 1340°F and 540 ft/sec. It discharges at
30.6 psia, 820°F and 1000ft/sec. Find the work output per pound gas.
A. 124 BTU/lbm
B. 258 BTU/lbm
C. 345 BTU/lbm
D. 422 BTU/lbm
A
A. 124 BTU/lbm
8
Q
The Reynold’s number of a sphere falling in air is 1E6. If the sphere’s radius is 1ft, what is its velocity? Density of air is 0.00234 slug/ft3
and
viscosity of air is 3.8E-7 lbf-sec/ft2
A. 2.5 ft/s
B. 5.1 ft/s
C. 40.6 ft/s
D. 81.2 ft/s
A
D. 81.2 ft/s
9
Q
A modern jet engine has an initial velocity of almost zero and an exhaust velocity of about 1350 ft/s. Medium-sized ones produce a thrust of
20,000 lbf. What is the air flow rate required by such an engine in kg/s?
A. 477
B. 216
C. 186
D. 98
A
B. 216
10
Q
In a packed column, operating at approximately atmospheric pressure and 295 K, a 10% ammonia-air mixture is scrubbed with water and
the concentration is reduced to 0.1%. If the whole of the resistance to mass transfer may be regarded as lying within a thin laminar film on
the gas side of the gas-liquid interface, derive from first principles an expression for the rate of absorption at any position in the column. At
some intermediate point where the ammonia concentration in the gas phase has been reduced to 5%, the partial pressure of ammonia in
equilibrium with the aqueous solution is 660 N/m2
and the diffusivity of ammonia in air is 0.24 cm2
/s?
A. 0.000043 mm
B. 0.043 mm
C. 4.3 mm
D. blank talaga
A
B. 0.043 mm
11
Q
N2O5 decomposes into NO2 and NO3 with a rate constant 1.96 x 10 14 exp [-10,660/T] s-1. At t=0, pure N2O5 is admitted into a constant
temperature and volume reactor with an initial pressure of 2 atm. After 1 min, what is the total pressure of the reactor? T= 273 K.
A. 1.44 atm
B. 2.24 atm
C. 2.98 atm
D. 3.21 atm
A
B. 2.24 atm
12
Q
A drill press machine can be purchased at P100, 000.00 and is expected to have a constant salvage value of P20, 000.00 regardless of
its age. The operating cost for the first year is expected to be P40, 000.00 and it will then increase P20, 000.00 per year as a result of
degrading efficiency. If the interest rate is 10%, determine the economic service life of the drill press machine.
A. 2 yrs
B. 3 yrs
C. 4 yrs
D. 5 yrs
A
B. 3 yrs
13
Q
To what height will 68°F ethyl alcohol rise in a 0.005 inch internal diameter glass capillary tube? The density of alcohol is 49 lb/ft3
and the
surface tension is 0.00156 lbf/ft.
A. 0.306 ft
B. 0.036 ft
C. 0.063 ft
D. 0.630 ft
A
A. 0.306 ft
14
Q
The turbine of a jet engine operates adiabatically and receives a steady state flow of gases at 114 psia, 1340°F and 540 ft/s. It discharges
at 30.6 psia, 820°F and 1000 ft/s. find the work output per pound of gas.
A. 89 BTU/lb
B. 98 BTU/lb
C. 107 BTU/lb
D. 124 BTU/lb
A
D. 124 BTU/lb
15
Q
A quantity of air at 180°F originally occupies 20 ft3
at 30 psig. The gas is compressed reversibly and adiabatically to 180 psig. What is the
heat flow?
A. 120 Btu
B. 80 Btu
C. 40 Btu
D. 0
A
D. 0
16
Q
1000 gal/min of water is cascading down a height of 100 ft from a reservoir. If half of the energy generated is converted to electrical
energy, how many 100-watts bulb can be lighted in 30 seconds.
A. 84
B. 86
C. 94
D. 90
A
C. 94
17
Q
If 9 m3 of an ideal gas at 24°C and 150 kPa is compressed to 2m3, what is the resulting pressure assuming isothermal conditions?
A. 675 kPa abs
B. 688 kPa abs
C. 710 kPa abs
D. 725 kPa abs
A
A. 675 kPa abs
18
Q
From the data in problem #1, what would have been the pressure and temperature if the process is isentropic? Use k=1.3.
A. 1060 kPa abs, 193°C
C. 980 kPa abs, 460°C
B. 1060 kPa abs, 466°C
D. 980 kPa abs, 720°C
A
A. 1060 kPa abs, 193°C
19
Q
Estimate the height to which water will rise in a capillary tube of diameter 3 mm. Use surface tension is 0.0728 N/m and specific weight of
9810N/m3
A. 1.2 mm
B. 9.9 mm
C. 17.5 mm
D. 24.2 mm
A
B. 9.9 mm
20
Q
A vertical cylindrical tank with a diameter of 12m and a depth of 4m is filled with water to the top with water at 20°C and 50°C is 9.79 kN/m3
and 9.69 kN/m3
, respectively.
A. 4.7 m3
B. 5.2 m3
C. 5.8 m3
D. 6.7 m3
A
A. 4.7 m3
21
Q
Assuming normal barometric pressure, how deep in the ocean is the point where an air bubble, upon reaching the surface, has six times its
volume than it had at the bottom?
A. 30 m
B. 40 m
C. 50 m
D. 60 m
A
C. 50 m
22
Q
An iceberg having a specific gravity of 0.92 is floating on salt water of sp. Gr. 1.03. If the volume of ice above the water surface is 1000 m 3 ,what is the total volume of the ice?
A. 9364 m3
B. 9024 m3
C. 8945 m3
D. 8874 m3
A
A. 9364 m3
23
Q
A stone weighs 460 N in air. When submerged in water, it weighs 300 N. Find the specific weight of the stone.
A. 28.2 kN/m3
B. 32.1 kN/m3
C. 34.7 kN/m3
D. 38.8 kN/m3
A
A. 28.2 kN/m3
24
Q
A block of wood 0.20 m thick is floating in sea water. The specific gravity of wood is 0.65 while that of sea water is 1.03. Find the minimum
area of block which will support a man weighing 80kg.
A. 0.45 m2
B. 1.05 m2
C.1.98 m2
D. 2.44 m2
A
B. 1.05 m2
25
A spherical balloon, 9 m in diameter is filled with helium gas pressurized to 111 kPa at a temperature of 20°C and anchored by a rope to
the ground. Neglecting the dead weight of the balloon, determine the tension in the rope.
A. 2450.8 N
B. 2980.2 N
C. 3210.8 N
D. 3806.7 N
D. 3806.7 N
26
A block of wood requires a force of 40 N to keep it immersed in water and a force of 100 N to keep it immersed in glycerin (sp. gr. -1.8).
Find the specific gravity of the wood.
A. 0.6
B. 0.7
C. 0.8
D. 0.9
C. 0.8
27
A wooden spherical ball with specific gravity of 0.42 and a diameter of 300 mm is dropped from a height of 4.3 m above the surface of a water in a pool of unknown depth. The ball barely touched the bottom of the pool before it begin to float. Determine the depth of the pool.
A. 1.22 m
B. 2.18 m
C. 2.55 m
D. 3.11 m
D. 3.11 m
28
A cylindrical bucket 150 mm in diameter and 200 mm high contains 150 mm of water. A boy swings the bucket on a vertical plane so that
the bottom of the bucket describes a circle of radius 1 m. How fast should it be rotated so that no water will be spilled?
A. 24.22 rpm
B. 31.13 rpm
C. 38.88 rpm
D. 45.12 rpm
B. 31.13 rpm
29
Neglecting air resistance, determine the height a vertical jet of water will rise if projected with velocity of 21 m/s.
A. 12.4 m
B. 15.6 m
C. 22.5 m
D. 28.4 m
C. 22.5 m
30
RA 9297 is also known as
A. Chemical Engineering Law of 2004
C. RA 318
B. Revised Chemical Engineering Law
D. Chemical Engineering Law of 2005
A. Chemical Engineering Law of 2004
31
It is also known as the Toxic Substances and Hazardous Nuclear Wastes Control Act of 1990 is also known as __.
A. RA 6969
B. RA 9669
C. RA 9696
D. RA 6996
A. RA 6969
32
The Chemical Engineering Law (RA 9297) was signed on ___.
A. May 13, 2004
B. May 11, 2004
C. May 10, 2004
A. May 13, 2004
33
Also known as The Clean Air Act of the Philippines of 1999.
A. RA 8749
B. PD 984
C. RA 6969
D. PD 600
A. RA 8749
34
Ecological Solid Waste Management Act.
A. RA 6969
B. RA 8749
C. RA 9003
D. PD 984
C. RA 9003
35
The Board of Chemical Engineering may inspect the facilities, faculty, equipment and other aspect related to chemical engineering
program of educational institutions in coordination with
A. DOST
B. DOE
C. DECS
D. CHED
D. CHED
36
The design of the dry seal that is required of chemical engineers in order to practice the profession must be authorized by
A. PIChE
B. DOST
C. PRC
D. Board of Chemical Engineering
D. Board of Chemical Engineering
37
Potential members of the ChE Regulatory Board are nominated by this body.
A. PIChE
B. CHED
C. DECS
D. PRC
A. PIChE
38
What government agency supervises the Bureau of Patents, Trademarks and Technology transfer?
A. DOST
B. DTI
C. DSWD
D. DPWH
B. DTI
39
The PRC accredited professionals Organization for Chemical Engineers is the
A. Chemical Society
B. Philippine Institute of Chemical Engineers
C. Philippine Society of Chemical Engineers
D. Integrated Association of Chemists and Chemical Engineers
B. Philippine Institute of Chemical Engineers
40
The Board of Chemical Engineering shall complete correction of examination papers within ___ days from the last day of examination.
A. 20 B. 15 C. 10 D. 5
A. 20
41
Who in the Philippine Senate was the main proponent of the Chemical Engineering Law of 2004/
A. Ramon Magsaysay B. Aquilino Pimentel C. Franklin Drilon
D. Loren Legarda
C. Franklin Drilon
42
The commissioner of the Professional Regulation Commission must have executive of managerial of _____ years.
A. 10 B. 8 C. 6 D. 5
A. 10
43
How many person compost The Board of Chemical Engineering?
A. 3 B. 5 C. 7 D. 9
A. 3
44
The moral right of the copyrighted work belong to the
A. owner B. publisher C. author D. assigns
C. author
45
. The period of duration of a copyright begins with the creation of the work until ___ years after the death of the author.
A. 10 B.30 C. 20 D. 50
D. 50
46
The person who uses an invention for profit without the permission of the inventor is known as the
A. impostor
B. infringer
C. infrator
D. perpetrator
B. infringer
47
Who is the chairman of PRC?
A. Leonor Tripon-Rosero
C. Maria Fortuna-Ibe
B. Teresita Manzala D. Hermogenes Pobre
B. Teresita Manzala
48
Who is the chairman of the Board ofChemical Engineering
A. Francisco Arellano C. Rodrigo C. Ong
B. Ofelia Bulaong
D. Rizalino Nocon Jr.
B. Ofelia Bulaong
49
The new Chemical Engineering Law of 2004 shall take effect ___ days following its publication in the Official Gazette or in any major
newspaper of general circulation.
A. 10 B. 15 C. 20 D. 30
B. 15
50
The meeting of minds between two persons whereby one binds himself with respect to the other to give something or to render some
service.
A. obligation
B. elements
C. contract
D. consent
C. contract
51
Mark used in the sale and advertising of services of one person and distinguish them from the services of others.
A. trademark
B. service mark
C. birth mark
D. thumb mark
B. service mark
52
It protects the inventor from the illegal use of his invention.
A. patent B. permit C. license D. insurance
A. patent
53
. It is copying of ones written research without acknowledging the author.
A. plagiarism
B. infringement
C. cheating
A. plagiarism
54
A juridical necessity to give, to do or not to do.
A. permit
B. obligation
C. approval
B. obligation
55
Includes individual names and surnames, firm names, devices or words used by one to identify his business, vocations or occupations.
A. trademark
B. service mark
C. trade name
D. brand name
C. trade name
56
A legally binding agreement on promise to exchange goods or services.
A. contract
B. barter
C. memorandum
D. pro-forma
B. barter
57
It serves as a collective recognition by members of a profession of its responsibilities.
A. professional organization
C. foundation
B. code of ethics
D. Corporation
B. code of ethics
58
The keystone of professional conduct is
A. honesty
B. dignity
C. integrity
D. responsibility
C. integrity
59
Sound travels fastest in
A. air
B. water
C. iron
D. vacuum
C. iron
60
Sound does not travel through
A. solids B. liquids
C. gases D. vacuum
D. vacuum
61
Which of the following describes the image of an object which is placed between the focus and the concave spherical mirror?
A. real, larger, inverted
C. virtual, smaller, not inverted
B. virtual, larger, not inverted
D. real, smaller, inverted
B. virtual, larger, not inverted
62
LASER is a device for
A. producing a beam of white light
B. producing a beam of monochromatic and coherent light
C. producing a beam of high intensity incoherent light
D. Producing highly penetrating x-rays
B. producing a beam of monochromatic and coherent light
63
Sky appears blue because
A. there is more blue color in sunlight than any other color
B. short waves are scattered more than the long waves by the atmosphere
C. the eye is more sensitive to blue
D. the atmosphere absorbs long wavelengths more than short wavelengths
B. short waves are scattered more than the long waves by the atmosphere
64
The excess of assets over liabilities
A. proprietorship
B. equities
C. sunk cost
D. annuities
A. proprietorship
65
Single payment compound amount factor is the reciprocal of ___.
A. single payment present worth factor C. sinking fund factor
B. capital recovery factor
D. uniform series compound amount factor
A. single payment present worth factor
66
Gross income less gross expense before deducting provisions for income tax is
A. net income
B. gross proceeds
C. gross profit
D. gross sales
C. gross profit
67
We wish to extract nicotine from water using kerosene. If we have 100 lb of a 2% nicotine solution extracted once with 200 lb of kerosene,
what percentage of the nicotine will be extracted?
A. 64.5%
B. 55.4%
C. 42.3%
D. 36.5%
A. 64.5%
68
We must cool 2500 gallons per minute of water from 120°F to 80°F. A cooling tower at 70°F and 1 atm is to be designed to operate with
entering air of 40% relative humidity. How many cubic foot/min of entering air must be supplied?
A. 4.12E4 cfm
B. 1.61E5 cfm
C. 4.22E6 cfm
D. 5.88E3 cfm
B. 1.61E5 cfm
69
From data in problem #2, how many galloons/min of makeup water must be supplied if windage loss is 95% of the amount lost by
evaporation?
A. 110
B.115
C. 140
D. 150
D. 150
70
A solvent extraction will be performed on a solid B that contains a soluble component A (mass fractions x A = 0.25, XB = 0.75). The solvent
to be used, C, is mutually insoluble with solid B. If neglect the entrainment of B in the overflow solution and screw press the extracted solid
to be 1 lb of solution per pound of B, calculate the pounds of solute-A-free solvent C which must feed the extractor, per pound of A-B feed,
in order to obtain 95% of the solute A in the extract overflow solution.
A. 12.44 lb B. 14.75 lb C. 16.55 lb D. 19.12 lb
B. 14.75 lb
71
. From the data in problem #4, what is the concentration of A in the resulting extract overflow solution?
A. 1.67%
B. 98.33%
C. 14.55%
D. 85.45%
A. 1.67%
72
We wish to scrub acetone from an air stream containing 0.020 mole fraction acetone. If we use a counter current packed scrubber
designed so that the exit gas does not exceed 0.0002 mole fraction acetone, what is the number of overall gas phase transfer units? Base
your calculations upon the ff. data: gas rate = 1.75 lbmole/ft2
-hr-mole fraction difference; Henry's Law is valid and ye=1.75 xe (ye is the
acetone vapor in equilibrium with the mole fraction of acetone xe in the liquid).
A. 4.84
B. 6.55
C. 9.12
D. 11.52
A. 4.84
73
From the data in problem #6, what is the height of one transfer unit?
A. 0.577 ft
B. 5.442 ft
C. 1.114 ft
D. 2.557 ft
C. 1.114 ft
74
From the data in problem #6, what is the total height of packing used?
A. 15.44ft
B. 12.88 ft
C. 9.87 ft
D. 5.39 ft
D. 5.39 ft
75
An ideal mixture A and B is to be distilled continuously. If the relative volatility is constant at 1.75 and feed = saturated liquid with 50
mol% A feed rate =200 lbmol/hr
Distillation composition = 90% A bottoms composition =10% A
Find the minimum number of theoretical stages.
A. 7
B. 3
C. 10
D. 15
A. 7
76
. From the data in problem # 9, what is the minimum reflux ratio?
A. 5.12
B. 4.08
C. 1.93
D. 3.12
C. 1.93
77
The isothermal, irreversible, aqueous phase reaction A + B → E at 100°F obeys dCE/dt=rE=κCaCb, k=15 ft3
/lbmol-hr. Using a 1000 ft3
stirred tank reactor with an aqueous feed of 2000 ft2
/hr, what will be the outlet concentration of E if the inlet concentration of A and B are
both 0.25 lbmol/ft3
?
A. 0.1223 lbmol/ft3
B. 0.1885 lbmol/ft3
C. 0.2005 lbmol/ft3 D. 0.221lbmol/ft3
A. 0.1223 lbmol/ft3
78
. Forty-five pounds per min of water is heated from 60°F to 180°F in a 5/8 in 16BWG (Birmingham Wire Gage) heat exchanger tube. If the
steam condensing, at 260°F, on the outside of the tube gives an h0 of 1000 BTU/hr ft2
-°F, calculate the inside coefficient in BTU/hr ft2
-°F.
A. 2173
B.1840
C.1284
D. 852
A. 2173
79
From the data in problem 12, calculate the overall coefficient in BTU/hr-ft2
-°F.
A. 240
B. 412
C. 696
D. 886
C. 696
80
From the data in problem #12, calculate the tube length required.
A. 19.8 ft
B. 27.4 ft
C. 37.2 ft
D. 48.7 ft
B. 27.4 ft
81
From the data in problem #12, after a half year of operation, the overall heat transfer coefficient decreased by half what is the inside scale
coefficient in BTU/hr ft2
-°F?
A. 110
B. 220
C. 422
D. 696
D. 696
82
A 1 ¼ in schedule 40 steel pipe is insulated with a two inch layer of asbestos covered by a three-inch layer of 85% magnesia. If the
temperature inside the pipe wall is 300°F and the atmospheric temperature is 80°F, what is the heat loss per foot of pipe? Ksteel=26,
kasbestos=0.87, k85%=0.034 BTU/hr-ft-°F?
A. 25.4 BTU/hr
B. 39.1 BTU/hr
C. 48.7 BTU/hr
D. 58.9 BTU/hr
B. 39.1 BTU/hr
83
From the data in problem #16, what is the temperature between the two insulations?
A. 212°F
B. 200.9°F
C. 188.5°F
D. 177.5°F
A. 212°F
84
We wish to concentrate a colloidal solution from 15% to 65% solids. The specific heat of the feed, entering at 50°C is 0.93. The pressure
of the saturated steam to the evaporator is 10psia; the condenser pressure is 5-in Hg abs. The steam chest has an overall heat transfer
coefficient 200BTU/hr-ft2
-°F. Water must be evaporated at the rate of 35000lb/hr. Neglecting boiling point elevation, what must be the
heat surface required?
A. 2885 ft2
B. 3110 ft2
C. 3317 ft2
D. 3812 ft2
C. 3317 ft2
85
From the data in problem #18, what is the steam consumption?
A. 25,480 lb/hr
B. 33,575 lb/hr
C. 38,770 lb/hr
D. 40,130 lb/hr
D. 40,130 lb/hr
86
What size sharp-edge orifice was in use if a flow rate of 120gpm produced a 4-in Hg differential in a 4-in schedule 40 pipe? The fluid,
measured at 60°F, had a viscosity of 1centistoke and a specific gravity of 1.
A. 0.57 in
B. 0.98 in
C. 1.22 in
D. 2.21 in
D. 2.21 in
87
Seven hundred gallons per minute of water are being discharged by a centrifugal pump 5 ft above the pump inlet. The inlet pressure is 4-
in Hg above atmospheric and the discharge pressure is 29 psia. If the pump has an 8-in diameter inlet and a 4-in diameter discharge, find
the pump efficiency. Assume the pump input is 8 hp.
A. 55%
B. 64%
C. 73%
D. 84%
D. 84%
88
From the data in problem # 21, find the new flow rate if the pump speed is doubled.
A. 700 gpm
B. 1050 gpm
C. 1400 gpm
D. 1750 gpm
C. 1400 gpm
89
From the data in problem # 21, find the new net head if the pump speed is doubled.
A. 36 ft-lbf/lb
B. 72 ft-lbf/lb
C. 108 ft-lbf/lb
D. 148 ft-lbf/lb
D. 148 ft-lbf/lb
90
From the data in problem # 21, find the new brake horsepower if the pump speed is doubled.
A. 64 hp
B. 32 hp
C. 16 hp
D. 8 hp
A. 64 hp
91
A centrifuge with a 20-in diameter bowl 14-in deep operates at 1200 rpm giving a 2-in thick liquid layer when used with a sludge, whose
liquid has a specific gravity of 1.2 and a viscosity of 2.5 cp. The solid component of the sludge has a specific gravity of 1.7. If the cut size
of the particles is 35 microns, what is the capacity of the centrifuge in gallons per minute?
A. 843
B. 810
C. 794
D. 778
A. 843
92
A twin-cylinder, single acting compressor, working at 5 Hz, delivers air at 515 kN/m2
at the rate of 0.2 m3
/s. if the diameter of the cylinder is
20 cm, the cylinder clearance ratio is 5% and the temperature of the inlet air is 283K, calculate the length of the stroke of the piston.
A. 0.33 m
B. 0.45 m
C. 0.57 m
D. 0.62 m
B. 0.45 m
93
From the data in problem # 26, calculate the delivery temperature.
A. 300K
B. 375K
C. 425K
D. 500K
D. 500K
94
A single stage double acting compressor running at 3 Hz is used to compress air from 110 kN/m2
and 282 K to 1150 kN/ m2
. If the internal
diameter of the cylinder is 20 cm, the length of the stroke 25 cm, and the piston clearance 5%, calculate the maximum capacity of the
machine, referred to air at the initial temperature and pressure.
A. 0.047 m3/s
B. 0.104 m3/s
C. 0.224 m3/s
D. 0.358 m3/s
A. 0.047 m3/s
95
From the data in problem # 28, calculate the theoretical power requirements under isentropic conditions.
A. 17.3 kW
B. 22.1 kW
C. 27.5 kW
D. 30.2 kW
A. 17.3 kW
96
The heat of combustion of benzoic acid, measured in bomb calorimeter was found to be -770.9 kcal/mol at 25°C. Find the heat of
combustion of benzoic acid (in kcal/mol) at 25°C in a stream of oxygen, assuming complete condensation of water vapor to liquid.
A. -770.0
B. -771.2
C. -772.8
D. -774.5
B. -771.2
97
If the heats of combustion of methanol and carbon monoxide at 18°C are -173.7 kcal/mol and -67.6 kcal/mol respectively and the heat of
formation of water (liquid) is -68.4 kcal/mol, find the heat of reaction at 18°C for CO(g) + 2H2(g) → CH3OH(l)
A. -20.8 kcal
B. -24.5 kcal
C. -30.7 kcal
D. -35.8 kcal
C. -30.7 kcal
98
One cubic meter of a gas at 18°C and 735 mmHg pressure is drawn through a heat exchanger where the gas temperature is raised to
420°C at a constant pressure. If the composition of the gas mixture is 27 v/v% carbon monoxide and 73 v/v% carbon dioxide, calculate
the heat taken up by the gas.
A. 156.5 kcal
B. 280.9 kcal
C. 358.1 kcal
D. 433.6 kcal
A. 156.5 kcal
99
Find the change in entropy when 15 L of a near ideal gas, argon, at 23°C and 925 mmHg pressure (absolute) are heated in an autoclave
to 730°C.
A. 2.73 cal/K
B. 3.12 cal/K
C. 3.55 cal/K
D. 4.22 cal/K
A. 2.73 cal/K
100
125 g of carbon dioxide were sublimed at 10°C and at atmospheric pressure. Find the entropy change when this gas is heated to 470°C
(at atmospheric pressure).
A. 12.88 cal/K
B. 16.55 cal/K
C. 22.45 cal/K
D. 28.03 cal/K
D. 28.03 cal/K
101
The standard free energy change for the reaction CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) is -194.8 kcal at 25°C to -191.82 kcal at 75°C.
Calculate the heat of reaction at 25°C.
A. -187.8 kcal
B. -200.6 kcal
C. -212.6 kcal
D. -228.7 kcal
C. -212.6 kcal
102
Steam is expanded from 700°F and 200 psia to 5 psia in an 87% efficient turbine. What is the final enthalpy of the steam?
A. 1097.2 Btu/lb
B. 1055.9 Btu/lb
C. 989.7 Btu/lb
D. 887.9 Btu/lb
A. 1097.2 Btu/lb
103
An Otto cycle with a compression ratio of 7.5 operates from the suction condition of 14.2 psia, 85°F. Find the pressure and the
temperature at the end of compression if cold air (k=1.4) is the working substance.
A. 238 psia, 759°F
B. 204 psia, 489°F
C. 187 psia, 575°F
D. 125 psia, 450°F
A. 238 psia, 759°F
104
From the data in problem #37, find the pressure and temperature at the end of compression if hot air (k=1.32) is the working substance.
A. 203 psia, 578°F
B. 187 psia, 510°F
C. 178 psia, 488°F
D. 120 psia, 345°F
A. 203 psia, 578°F
105
From the data in problem #37, solve the ideal thermal energy.
A. 55.35%
B. 47.5%
C. 43.2%
D. 38.55
B. 47.5%
106
A Carnot engine operating between 900°F and 90°F produces 80,000 ft-lb of work. Determine the heat supplied.
A. 172.6 Btu
B. 184.3 Btu
C. 190.2 Btu
D. 198.7 Btu
A. 172.6 Btu
107
From the data in problem #40, determine the change in entropy during heat rejection.
A. 0.1269 Btu/R
B. -0.1269 Btu/R
C. 0.7882 Btu/R
D. -0.7882 Btu/R
B. -0.1269 Btu/R
108
From the data in problem #40, determine the thermal efficiency of the engine.
A. 45.77%
B. 54.22%
C. 59.55%
D. 67.44
C. 59.55%
109
There are removed 500 Btu per min of heat from a body by a refrigerator operating between the limits of 440R and 550R. If the coefficient
of a performance is ¾ of that of a Carnot refrigerator working between the same temperature limits, find the heat rejected.
A. 245 Btu/min
B. 345 Btu/min
C. 498 Btu/min
D. 667 Btu/min
D. 667 Btu/min
110
From the data in problem #43, find the work input.
A. 1.87 hp B. 2.45 hp C. 3.95 hp D. 4.88 hp
C. 3.95 hp
111
The time for a system to respond to a step input and attain a response equal of the magnitude of the input.
A. response time
B. equalization time C. rise time
D. equilibrium time
C. rise time
112
The system that uses a measurement of the output and compares it with the desired output.
A. feed-forward control system
C. closed-loop feedback control system
B. adaptive control system
D. inferential control system
C. closed-loop feedback control system
113
The output signal is fed back so that it adds to the input signal.
A. positive feedback B. negative feedback C. comparator gain D. forward feedback
A. positive feedback
114
A system that exhibits the desired performance in the presence of significant plant uncertainty.
A. stable control
B. reliable control
C. automatic control D. robust control
D. robust control
115
A sensor usually made of a semiconductor that utilizes the effect of temperature on the resistance to current is called a
A. thermocouple
B. thermistor
C. resistor
D. capacitor
B. thermistor
116
A process for the production of aluminum through electrolysis of a solution of bauxite in molten cryolite.
A. Solvay process
C. Downs process
B. Lead chamber process
D. Hall-Heroult process
D. Hall-Heroult process
117
An early method for the production of sodium carbonate from sodium chloride, calcium carbonate and sulfuric acid.
A. Frasch process
B. Leblanc process C. Solvay process
D. Raschig process
B. Leblanc process
118
An industrial process for the production of steel from iron using a long horizontal furnace to which are added pig iron and limestone.
A. open hearth process
B. Bessemer process C. arc process
D. Haber-Bosch process
A. open hearth process
119
It is commonly applied to any process used to effect partial or complete demineralization of highly saline waters such as seawater (35,000
ppm of dissolved salts) or brackish waters.
A. purification
B. desalting
C. deaeration
D. electrodialysis
B. desalting
120
A type electric furnace where heat is produced by an electric arc between two or more electrodes, which are usually graphite or carbon,
between the electrodes and the furnace charge, may or may not be consumed in the operation, or between the electrodes and the
furnace charge.
A. arc furnace
B. induction furnace
C. resistance furnace
D. plasma
A. arc furnace
121
What is the reaction rate constant, k, for the third order reaction?
A. (L/mol)/s
B. (L/mol)/s2
C. (L/mol)2/s
D. (L/mol)3/s
C. (L/mol)2/s
122
The activation energy of a reaction can be obtained from the slope of
A. log k vs 1/T
B. k vs log T
C. log k vs T
D. k vs log (1/T)
A. log k vs 1/T
123
A reaction is is known to be first order in A. A straight line will be obtained by plotting
A. log CA vs time
B. log CA vs 1/T
C. CA vs T
D. 1/ CA vs T
A. log CA vs time
124
If the reaction 2A → B + C is second order, which of the following plots will give a straight line?
A. CA2 vs T
B. 1/ CA vs T
C. log CA vs time
D. CA vs T
B. 1/ CA vs T
125
Small-scale units designed to allow experiments that obtain design data for larger plants and sometimes to produce significant quantities
of a new product to permit user evaluation of it.
A. benchmark
B. pitot plants
C. model
D. replica
B. pitot plants
126
It is a grant of exclusive right to the inventor to his invention for limited period of time.
A. invention
B. copyright
C. marketable product
D. patent
D. patent
127
It is the fraction of raw material recovered as the main product.
A. yield
B. conversion
C. recovery
D. production
A. yield
128
A horizontal cylindrical tank with flat ends is used to store gasoline. The tank dimensions are D=2m, L=5 m. when the level in the tank is
0.5 m, the content of the tank is
A. 2.50 m3
B. 5.00 m3
C. 3.07 m3
D. 3.93 m3
C. 3.07 m3
129
The Brinell number of a material is a measure of
A. specific gravity
B. specific heat
C. density
D. hardness
D. hardness
130
Estimate the necessary wall thickness for a horizontal cylindrical pressure vessel with the diameter of 10 ft, a working pressure of 250 psig and a design tensile stress of 20,000 psig.
A. 1.90 cm
B. 2.70 cm
C. 2.30 cm
D. 2.50 cm
A. 1.90 cm
131
A chemical engineer was commissioned to design a vertical cylindrical tank with a flat bottom and a conical roof. The tank must be able to
hold a maximum of 4500 m3 of water for firefighting purposes. Ease of climbing the tank and bearing capacity allows a maximum height of
16.5 m from the bottom of the tank up to the rim of the tank cylinder. Normal working practice dictates that the maximum working capacity
of the tank is 90% of the total tank volume. The tank roof has a 10° incline. Suitable steel plates available for constructing the tank come
in size 4 ft by 8 ft sheets. The number of sheets needed is
A. 540
B. 575
C. 610
D. 525
A. 540
132
Estimate the optimum economic inside diameter of pipe when 10,000gal of a liquid having a density of 58 lb/ft3 flow through the pipe per
hour. The flow is turbulent. The approximate value for the optimum diameter of a steel pipe may be obtained from the ff dimensional
equation:
Di = 2.2w^0.45/ρ^0.32
where Di = optimum inside diameter, in.
w = mass rate, 1,000 lb/h
ρ= density of the flowing fluid, lb/ft3
A. 5.3 in
B. 3.3 in
C. 4.3 in
D. 3.7 in
C. 4.3 in
133
A pressure vessel is to be made from a cylinder of diameter X m capped with a hemisphere. The cost of the cylinder section is 1,800X 0.5
in P per meter of length and the cost for one hemispherical end is 1,400X2.4 in pesos. The vessel is to hold 40 cubic meter. Find the
optimum dimension X.
A. 2.5 m
B. 2.25 m
C. 2.0 m
D. 2.75 m
B. 2.25 m
134
A 95 tons refrigeration system has a compressor power of 90 Hp. Find the coefficient of performance, COP.
A. 3.85
B. 2.77
C. 4.77
D. 1.99
C. 4.77
135
A furnace is fired with coal containing 6% moisture, 18% VCM, 67% FC, and 9% ash. The refuse analysis shows 5% VCM, 10% M, 23%
FC and 62% ash. The higher heating value of the coal "as fired" is 14,300 BTU/lb. calculate the % of the heating value of the coal that is
lost in the refuse. The moisture in the refuse is due to "wetting down" to prevent dusting. It is not moisture from the original coal.
A. 4.68%
B. 5.75%
C. 9.08%
D. 12.92%
A. 4.68%
136
A furnace completely burns coal containing 70% C. analysis of the flue gas shows 15% CO2, 4% O2, 81% N2 and no CO. what is the %
of the net hydrogen in the coal?
A. 6.126%
B. 1.53%
C. 2.38%
D. 3.94%
D. 3.94%
137
Pure carbon is burned with theoretical air. However, only 80% of the carbon burned and of the carbon burned half formed CO2 and the
rest formed CO. what is the %CO2 in the flue gas?
A. 8.40%
B. 7.00%
C. 9.6%
D. none of these
D. none of these
138
A furnace burns coal containing 4.1% moisture, 24% VCM, 63% FC, 1.2% N. 1.8% S and 8.9% ash. The coal has a heating of 32,000
kJ/kg and the refuse was analyzed to contain 4.8% VCM, 12.6% FC, and 82.6% ash. The type combustible material present is
A. coked coal
C. uncoked coal
B. coked and uncoked coal
D. partially coked coal
C. uncoked coal
139
A furnace burns coal containing 4.1% moisture, 24% VCM, 63% FC, 1.2% N. 1.8% S and 8.9% ash. The coal has a heating of 32,000
kJ/kg and the refuse was analyzed to contain 4.8% VCM, 12.6% FC, and 82.6% ash. The % of the carbon lost in the refuse is
A. 2.16%
B. 2.97%
C. 3.02%
D. 2.98%
A. 2.16%
140
Two hundred moles of a gaseous mixture of CH4 and air contain 50 moles CH4. What is the average molecular weight of the gas?
A. 28.75
B. 25.75
C. 21.75
D. 18.50
B. 25.75
141
A type of screening equipment operated with a shaking motion, a long stoke at low frequency.
A. vibrating screens
B. reciprocating screens
C. oscillating screens
D. revolving screens
B. reciprocating screens
142
The hardness of a mineral is a criterion of its resistance to crushing. Which of the ff. is an example of a hard material?
A. talc
B. calcite
C. sapphire
D. feldspar
C. sapphire
143
Find the horse power requirement for a continuous bucket elevator with loading leg which wll lift solids at a rate of 50 tons per hour at a
vertical distance of 22 feet.
A. 2
B. 8
C. 4
D. 6
A. 2
144
Sphericity of a cubical particle when its equivalent diameter is taken as the height of the tube is
A. 0.5
B. √2
C. 1
D. √3
A. 0.5, C. 1
145
Dispersants are important for the control of slimes which sometimes interfere with the selectivity and increase reagent consumption,
another term for dispersants is
A. deflocculant
B. depressants
C. frothers
D. regulators
A. deflocculant
146
The separation of a fluid-solid mixture involving passage of most of the fluid through a porous barrier which retains most of the solid
particulates contained in the mixtures is known as
A. drying
B. filtration
C. fluid flow
D. evaporation
B. filtration
147
An ultracentrifuge is used to separate high-molecular weight fraction in polymeric or biological systems. What is the gradient for mass
transfer in the separation using this mass transfer device?
A. temperature
B. pressure
C. concentration
D. electric field
B. pressure
148
The dimensionless quantity, which for the fluid flowing inside tubes, can be regarded as the ratio of the shear stress energy (at the tube
wall) to the kinetic energy.
A. Dean number
B. Prandtl number
C. Biot number
D. Fanning friction number
D. Fanning friction number
149
The Graetz number is concerned wit h
A. mass transfer between a gas and a liquid
C. absorption with chemical reaction
B. heat transfer in turbulent flow
D. heat transfer in laminar flow
D. heat transfer in laminar flow
150
It is a unit operation which involves the mass transfer of soluble materials from the liquid phase to the gaseous phase.
A. absorption
B. drying
C. desorption
D. humidification
C. desorption
151
100 lb of saturated liquid water at 50 psia contained in a closed vessel are heated until 80% of water is vaporized. The amount of heat
added to the system is closest to
A. 90876 Btu
B. 73920 Btu
C. 65200 Btu
D. 84200 Btu
B. 73920 Btu
152
Air is bubbled through a drum G of liquid hexane at a rate of 0.1 kmol/min. the gas stream leaving the drum contains 10 mol% hexane
vapor. Air may be considered insoluble in liquid hexane. Estimate the time required to vaporize 10 m3 of the liquid.
A. 3150 min
B. 4850 min
C. 5280 min
D. 6880 min
D. 6880 min
153
Ethane reacts with pure oxygen to form water and carbon dioxide. If 3 moles of ethane and 12 moles of oxygen is mixed, and 80% of the
ethane reacts, what is the % excess of oxygen?
A. 14.3%
B. 20.5%
C. 30.2%
D. 50%
A. 14.3%
154
Ninety g of ethane and 384 g of oxygen are fed continuously to a laboratory furnace. The total combustion products collected was 16.2 gmol with no carbon monoxide. However, not all of the ethane was burned due to faulty combustion. The fraction of ethane that was
burned is equal to
A. 90%
B. 85%
C. 80%
D. 92%
C. 80%
155
A 10 N aqueous solution of sulfuric acid (30°Tw) is made to react with a 55% aqueous solution of sodium hydroxide (64°Be) to form 1350
g of sodium sulfate per L of sodium hydroxide solution. The volume ratio of the acid to the base solution is 2:1. The limiting reactant in the
reaction is
A. NaOH
B. H2SO4
C. Na2SO4
D. H20
B. H2SO4
156
The degree of completion of the above reaction is
A. 85%
B. 92%
C. 95%
D. 72%
C. 95%
157
Octane burns according to the ff. equation: 2C8H18 + 25O2 → 16CO2 + 18H2O. How many grams of CO2 are produced when 5.00g of
C8H18 are burned?
A. 40.0 g
B. 0.351 g
C. 15.4 g
D. 30.9 g
C. 15.4 g
158
At 55°C and 1 atm N2O4 is 50.3% dissociated to NO2 according to the reaction N2O4 → 2NO2. What is the density of the gas?
A. 1.02 g/L
B. 2.27 g/L
C. 1.85 g/L
D. 1.4 g/L
B. 2.27 g/L
159
A laundry can purchase soap containing 30% of water at price of $7 per 100 lb. the same manufacturer offers soap containing 5% of
water. If the freight rate is 60 cents per 100 lb., what is the maximum price that the laundry should pay the manufacturer for the soap
containing 5% of water?
A. $9.71
B. $3.90
C. $7.45
D. $10.54
A. $9.71
160
A mixing tank mixes two inlet streams containing salt. The salt concentration in the stream 1 is 5% by weight. Stream 1 flows at 25 kg/s
and stream 2 at 10 kg/s. there is only one exit stream. Find the salt concentration in the exit stream.
A. 5%
B. 8%
C. 11%
D. 13%
B. 8%
161
A solution containing 15% dissolved solids is to be concentrated to 60% dissolved solids. If the evaporator will evaporate 20,000 kg of
water per hour, what must be the feed rate in kg/hr?
A. 16803
B. 17782
C. 23333
D. 26667
D. 26667
162
We are going to purify seawater by freezing pure water out of it as ice and we want to get 200 kg/hr of pure water in the form of ice. if the
sea entering the freezing unit is 2 wt% NaCl and 98% water, how many kg of entering seawater are needed per hour if the exit liquid brine
concentration is 10 wt% NaCl and 90% water?
A. 2250
B. 2500
C. 3500
D. 4000
A. 2250
163
A clay was partially dried and then contained 50% silica, 7% water and the balance inerts. The original clay contained 12% water. What is
the % silica in the original sample?
A. 28.4%
B. 51.6%
C. 37.8%
D. 47.3
D. 47.3
164
2320 g of methanol cyclopentane is detonated in the absence of air in a 1000 L closed bomb calorimeter according to the reaction below.
C9H12N4O18 → 4CO2 + 5CO + 5H2O + H2 + 2N2. The temperature in the bomb if the pressure rises to 300 kPa is
A. 425 K
B. 365 K
C. 285 K
D. 345 K
A. 425 K
165
Paper is passing continuously through a tunnel drier. The entering paper contains 10%w H2O (dry basis) and the leaving paper contains
2%w H2O (dry basis). How many lb of water is evaporated per hour if 1000 lb/hr of paper enters the drier?
A. 90.9
B. 18.18
C. 72.72
D. 25.05
C. 72.72
