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Home Q & A Board Science-Related Homework Help Physics and Astronomy Engineering
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An air stream containing 4% ammonia (by volume) is to be introduced to the bottom of a packed ...
An air stream containing 4% ammonia (by volume) is to be introduced to the bottom of a packed ...
An air stream containing 4% ammonia (by volume) is to be introduced to the bottom of a packed column, which is filled with 2-inch ceramic Berl saddles, at a molar flux of 20 lbmol/h.ft2. Pure water is fed to the top of the column at 1020 l
cloveb   51   2 Replies
A month ago
CHE 318 - A granular polymeric material is to be dried by blowing air through the material in a ...
CHE 318 - A granular polymeric material is to be dried by blowing air through the material in a ...
A granular polymeric material is to be dried by blowing air through the material in a fixed bed. The thickness of the bed is 7 cm. the bed porosity is 0.60, and the specific area of the solid particles in the bed is 185 m2/m3. The particle average di
cloveb   32   2 Replies
A month ago
Sulfur dioxide produced by the combustion of sulfur in air is absorbed in water. Pure SO2 is then ...
Sulfur dioxide produced by the combustion of sulfur in air is absorbed in water. Pure SO2 is then ...
Sulfur dioxide produced by the combustion of sulfur in air is absorbed in water. Pure SO2 is then recovered from the solution by steam stripping. Make a preliminary design for the absorption column. The feed will be 5000 kg/hr of gas containing 8 mol
cloveb   25   1 Reply
A month ago
Normal exhaust back pressure should be 2.5 PSI of more.
Normal exhaust back pressure should be 2.5 PSI of more.
True/false
Nerioed   38   1 Reply
A month ago
The diameter of a cylinder is called the ________.
The diameter of a cylinder is called the ________.
A) Stroke      B) Diameter      C) Bore      D) Radius
hungvu1997   107   1 Reply
2 months ago
Which of the following is not correct: Ethics is the study of
Which of the following is not correct: Ethics is the study of
Which of the following is not correct:  Ethics is the study of

a) Good/evil
b) Right/wrong
c) Justice and political ideals
d) Nice/not nice
e) All of the above
cloveb   116   1 Reply
2 months ago
Automotive question on chapter 11 of automotive electrical.
Automotive question on chapter 11 of automotive electrical.
Technician A says that magnetic lines of force can be seen
by placing iron filings on a piece of paper and then holding
them over a magnet. Technician B says that the effects
of magnetic lines of force can be seen using a compass.
riceman1   121   1 Reply
3 months ago
An SOHC V-8 engine has how many camshafts?
An SOHC V-8 engine has how many camshafts?
A) One      B) Three      C) Two      D) Four
hungvu1997   76   1 Reply
3 months ago
The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. ...
The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. ...
A) Combustion       B) Torque      C) Power      D) Consumption
hungvu1997   53   1 Reply
3 months ago
How many degrees of CAMSHAFT rotation are needed for a piston to travel from TDC to BDC and return ...
How many degrees of CAMSHAFT rotation are needed for a piston to travel from TDC to BDC and return ...
A) 90      B) 720      C) 180      D) 360
hungvu1997   53   1 Reply
3 months ago
How many degrees of CAMSHAFT rotation are needed to complete the four stroke combustion cycle?
How many degrees of CAMSHAFT rotation are needed to complete the four stroke combustion cycle?
A) 180      B) 720      C) 90      D) 360
hungvu1997   58   1 Reply
3 months ago
How many degrees of CRANKSHAFT rotation are required for a piston to travel from TDC to BDC and ...
How many degrees of CRANKSHAFT rotation are required for a piston to travel from TDC to BDC and ...
A) 360      B) 90      C) 720      D) 180
hungvu1997   46   1 Reply
3 months ago
How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle ...
How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle ...
A) One      B) One-fourth      C) One-half      D) Two
hungvu1997   53   1 Reply
3 months ago
The coolant flow through the radiator is controlled by the ________.
The coolant flow through the radiator is controlled by the ________.
A) Thermostat     
B) Size of the passages in the block
C) Water pump     
D) Cooling Fan(s)
hungvu1997   72   1 Reply
3 months ago
Technician A says that changing connecting rod length changes engine stroke. Technician B says that ...
Technician A says that changing connecting rod length changes engine stroke. Technician B says that ...
A) Technician A      B) Technician B      C) Both technicians      D) Neither technician
hungvu1997   71   1 Reply
3 months ago
How many degrees of CRANKSHAFT rotation are needed to complete the four stroke combustion cycle?
How many degrees of CRANKSHAFT rotation are needed to complete the four stroke combustion cycle?
A) 180      B) 90      C) 360      D) 720
hungvu1997   50   1 Reply
3 months ago
The ratio of the volume of a cylinder with the piston at BDC to the volume of the cylinder with the ...
The ratio of the volume of a cylinder with the piston at BDC to the volume of the cylinder with the ...
A) Volume ratio      B) Displacement      C) Compression ratio      D) None of these
hungvu1997   79   1 Reply
3 months ago
Which part of the four stroke cycle is illustrated in this drawing?
Which part of the four stroke cycle is illustrated in this drawing?
A) Exhaust   B) Compression   C) Power      D) Intake
hungvu1997   44   1 Reply
3 months ago
In this drawing, which item is the camshaft?
In this drawing, which item is the camshaft?
A) A      B) B      C) C      D) None of these
hungvu1997   46   1 Reply
3 months ago
Natural red hair consists of two genes. People with red hair have two dominant genes, two regressive ...
Natural red hair consists of two genes. People with red hair have two dominant genes, two regressive ...
Natural red hair consists of two genes. People with red hair have two dominant genes, two regressive genes, or one dominant and one regressive gene. A group of 1000 people was categorized as follows:

          &nbs
cloveb   558   1 Reply
Hard
3 months ago
At Pa=0.5, what is the numerical probability of finding one Branch unit connected to another by a ...
At Pa=0.5, what is the numerical probability of finding one Branch unit connected to another by a ...
A step-growth polymerization is started with the following initial composition:

A3      1 mol
AA      1 mol
B        1 mol
BB      2 mol

At Pa=0.5,
cloveb   105   2 Replies
Hard
3 months ago
A container in the shape of a right circular cylinder with no top has surface area 3 pi ...
A container in the shape of a right circular cylinder with no top has surface area 3 pi ...
A container in the shape of a right circular cylinder with no top has surface area 3 pi ft2. What height h and base radius r will maximize the volume of cylinder? Apply Matlab optimization toolbox.


CHE 425   Process and Eng
cloveb   234   2 Replies
3 months ago
The hoop stress, Qh, at the outer surface of a pipe with internal pressure, P, outside diameter d1, ...
The hoop stress, Qh, at the outer surface of a pipe with internal pressure, P, outside diameter d1, ...
The hoop stress, Qh, at the outer surface of a pipe with internal pressure, P, outside diameter d1, and inside diameter d2 is

Qh=(2Pd22)/(d12-d22)

A well-made PVC pipe has o
cloveb   101   2 Replies
Hard
4 months ago
The stress relaxation behavior of a particular grade of polymer under constant strain is given by ...
The stress relaxation behavior of a particular grade of polymer under constant strain is given by ...
The stress relaxation behavior of a particular grade of polymer under constant strain is given by the following expression:

T(t)= Gyoe-t/A + To

Where G is constant, yo is th
cloveb   82   1 Reply
Hard
4 months ago
Describe how TLC could be used to confirm whether a compound was pure or not. Were all of the ...
Describe how TLC could be used to confirm whether a compound was pure or not. Were all of the ...
Describe how TLC could be used to confirm whether a compound was pure or not. Were all of the standard analgesic solutions provided for you in this experiment pure?
cloveb   108   1 Reply
4 months ago
Alculate the fraction of crystallinity of polythylene samples with densities at 20oC of 926, 940 and ...
Alculate the fraction of crystallinity of polythylene samples with densities at 20oC of 926, 940 and ...
a) Calculate the fraction of crystallinity of polythylene samples with densities at 20oC of 926, 940 and 955 kg/m3. Take the specific volume of crystalline polyethylene as 0.989 x 10-3 m3/kg and that of amo
cloveb   83   1 Reply
Hard
4 months ago
Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within ...
Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within ...
1. A vehicle's oil pressure warning light is on. Technician A says that the pressure-sending unit should be replaced and the vehicle re-checked. Technician B says that a mechanical oil pressure gauge should be used to check the oil pressure befo
gerska   551   1 Reply
4 months ago
Technician A says that most experts recommend replacing all drum brake hardware including the ...
Technician A says that most experts recommend replacing all drum brake hardware including the ...
Technician A says that most experts recommend replacing all drum brake hardware including the springs every time the brake linings are replaced. Technician B says that the starwheel adjuster must be cleaned and lubricated to assure proper operation.
Chris70324   141   1 Reply
4 months ago
What is the partition coefficient for 3-nitroaniline between diethyl ether and water (at room ...
What is the partition coefficient for 3-nitroaniline between diethyl ether and water (at room ...
Use information available in the Merck Index, and show your calculations to answer the following questions:

a) What is the partition coefficient for 3-nitroaniline between diethyl ether and water (at room temperature and pH > 8)?
cloveb   84   1 Reply
4 months ago
Draw the structure of acetanilide, phenacetin and acetaminophen, and indicate(using the standard ...
Draw the structure of acetanilide, phenacetin and acetaminophen, and indicate(using the standard ...
a) Draw the structure of acetanilide, phenacetin and acetaminophen, and indicate(using the standard symbols) all polar bonds in both molecules. Based on these structure, and intermolecular forces involved in silica gel TLC , what order would you have
cloveb   102   1 Reply
4 months ago
Onsider a single crystal of silver oriented such that a tensile stress is applied long a [001] ...
Onsider a single crystal of silver oriented such that a tensile stress is applied long a [001] ...
Consider a single crystal of silver oriented such that a tensile stress is applied long a [001] direction. If slip occurs on a (111) plane and in a [101] direction, and is initiated at an applied tensile stress of 1.1MPa (160psi), compute the
cloveb   135   N/A
4 months ago
What is the difference between crystal structure and crystal system?
What is the difference between crystal structure and crystal system?
What is the difference between crystal structure and crystal system?

CHE 307   Chemical Engineering Materials
cloveb   189   1 Reply
Hard
4 months ago
An uncold-worked brass specimen of average grain size 0.008 mm has a yield strength of 160 MPa ...
An uncold-worked brass specimen of average grain size 0.008 mm has a yield strength of 160 MPa ...
An uncold-worked brass specimen of average grain size 0.008 mm has a yield strength of 160 MPa (23,500 psi). Estimate the yield strength of this alloy after it has been heated to 600oC for 1000s, if it is known that the value of Ky is 12.0
cloveb   205   1 Reply
Hard
4 months ago
According to the code of ethics, which of the following activities would be unethical?
According to the code of ethics, which of the following activities would be unethical?
According to the code of ethics, which of the following activities would be unethical?

a) Reviewing the work of another P.Eng. with his/her consent
b) Providing consulting services
c) Signing a plan prepared by unknown persons
cloveb   115   1 Reply
Hard
4 months ago
If a mixture of 50mL of ethanol and 5 mL of benzene are distilled through a perfect fractionating ...
If a mixture of 50mL of ethanol and 5 mL of benzene are distilled through a perfect fractionating ...
If a mixture of 50 mL of ethanol and 50 mL of benzene are distilled through a perfect fractionating column, what temperature will the first vapour passing through the top of the fractionating column be? What is the mol % composition of the first frac
cloveb   123   1 Reply
Hard
4 months ago
Find x and y to maximize A=xy if 2x+y=24 (Process and Engineering Optimizatio)
Find x and y to maximize A=xy if 2x+y=24 (Process and Engineering Optimizatio)
Find x and y to maximize A=xy if 2x+y=24


CHE 425   Process and Engineering Optimization Quiz 2013
cloveb   120   1 Reply
4 months ago
Calculate the number average molecular weight Mn and the corresponding degree of polymerization of ...
Calculate the number average molecular weight Mn and the corresponding degree of polymerization of ...
Engineering - Polymer Science Problem:

Given that homopolymers formed by the following monomers (a  - e) have the following molecular mass distribution:

w1              M1
0.05 
cloveb   129   1 Reply
Hard
4 months ago
On the shelf in your lab, you find a bottle with a hand-written label: “pure ethyl acetate”
On the shelf in your lab, you find a bottle with a hand-written label: “pure ethyl acetate”
Engineering-Organic Chemistry Question

On the shelf in your lab, you find a bottle with a hand-written label: “pure ethyl acetate” and you measure its refractive index. The temperature in the lab is 28 °C (it’s a sweltering summer d
cloveb   162   1 Reply
Hard
4 months ago
Maximize Z = 3x1 + 5x2 Subject to: x1 + x2 ≥ 2 (Process and Engineering Optimization)
Maximize Z = 3x1 + 5x2 Subject to: x1 + x2 ≥ 2 (Process and Engineering Optimization)
Maximize Z = 3x1 + 5x2
Subject to: x1 + x2 ≥ 2
                3x1 + 2x2 = 18
                 − x2 ≥ −6
             &n
cloveb   154   1 Reply
Hard
4 months ago
What are some advantages of a belt drive?
What are some advantages of a belt drive?
can i have to advantages of a belt drive
AwesomChic   118   3 Replies
Hard
5 months ago
New Topic    
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