Describe the Diagrammatic Stress Displacement Curve and which strength should be used and when.
In: Other
In a device to produce drinking water, humid air at 32C, 90% relative humidity and 1 atm is cooled to 5C at constant pressure. If the duty on the unit is 2,200 kW of heat is removed from the humid air.
Data: Air at 32C has H = 0.204 kJ/mol and at 50C has H = -0.576 kJ/mol
H of steam can be found on the steam tables – vapor at 32C and 1 atm; vapor at 5C and liquid at 5C. Assume the volume of the humid air follows the ideal gas law.
H of water liquid at 5C = 21 kJ/kg; vapor at 5C = 2510.8 kJ/kg; H of water vapor at 32C = 2560.0 kJ/kg
What is the flow of humid air entering the system in mol/min?
What is the flow of humid air entering the system in m^3?
How much drinking water is produced by the system in lit/min?
In: Other
1.In combustion of natural gas how is the water influence the reaction(as quantity and quality)? List assumptions and conditions.
2.What happens to concentration of CO as a function of time in combustion of natural gas (as quantity and quality) ? List assumptions and conditions. (Constant Volume, Isothermal, Batch Reactor, Ambient air O2. )
In: Other
In: Other
Glass Transition Temperature and Molecular Motion
List the order of the glass transition temperatures for polyethylene, polypropylene, polyvinyl chloride, and polystyrene. PE (-80), PP (-20), PVC (85), PS (100).
Define the glass transition temperature in polymer materials. –
Describe the reason for this vast range of glass temperatures among these 4 materials.
In: Other
In general, condensation polymers have higher monomer feedstock costs but lower capital costs to synthesis. False or True.
Above the critical degree of polymerization, molecular weight largely governs the mechanical properties of the polymer. True or False.
A and B are monomers polymerized to form the following copolymer:
A-A-B-A-B-B-A-A-A-B-A-B-A-A-B-B-B-B. This is an example of a block copolymer. True or False
Engineering Thermoplastics are a class of polymers which are generally more expensive than commodity polymers. True or False.
The processes of crystallization occurs at temperatures below the Tg (glass transition) True or False.
In: Other
How does conventional oven cooking different from boiling cooking in respect of conduction, convection, and radiation of heart transfer
In: Other
Differentiate Nusselt and Biot number amidst almost the same formula.
In: Other
The Henry’s law constant for CO2 dissolved in dichloromethane (DCM) at 25 °C is 153 bar.
a) If the vapor pressure of dichloromethane at this temperature is 56.6 kPa, what is the solubility of CO2 if the total pressure is 1 bar?
b) 100 mole/s of a mixture 17 mole% CO and the rest DCM is fed to a Flash unit operating at 25 °C and 1 bar. Determine the molar flow rates of the exiting vapor and liquid streams and their compositions.
In: Other
(ii) Briefly outline methods for BNCT beam production and
their
advantages and disadvantages. Explain advantage of epithermal
neutron BNCT and the method of epithermal neutron beam production
on a reactor .
In: Other
What factors inform the choice of the economic or optimum reflux ratio within a distillation column?
In: Other
What Happens to the bottom and top products if the feed point to a distillation column is switched from the designed optimum to
1. A tray closer to the reboiler?
2. A tray closer to the condenser?
In: Other
rank the top 5 best reactor from best to less best that can deal with high temperture reaction ?
Batch, CSTR, PFR , PBR other ??
In: Other
3. As a substitute non-chlorinated solvent for dry cleaning fabrics, bromopropane (C3H7Br) demand has increased. Bromopropane can be synthesized by reacting propanol (C3H8O) with hydrogen bromide (HBr), with water as the second product. A reactor is fed 20 kg/min propanol and 20 kg/min hydrogen bromide. (a) If one of the reactants is completely consumed, what is the composition of the reactor outlet stream? (b) What is the fractional conversion of the excess reactant? (c) What is the extent of reaction? (d) If 60% of the limiting reactant is consumed, what is the yield of bromopropane?
In: Other
|
Which of the following statements explains why oil has a greater viscosity than water? |
1. Oil molecules always move slower than water molecules 2. Oil molecules have more space in between them than water molecules 3. Oil molecules have a more complicated shape than water molecules 4. Oil molecules are less dense than water molecules |
|
Which of the following statements is incorrect? |
1. A catalyst does not alter the state of equilibrium in a chemical reaction 2. A catalyst remains unchanged at the end of a chemical reaction 3. A catalyst is highly specific in its action 4. A catalyst initiates a reaction. |
|
White phosphorous is stored under water, because |
1. it does not react with water 2. it is poisonous 3. it is unstable 4. its kindling temperature in dry air is very low |
|
With increase in the number of shell passes, the value of FT(Temperature correction factor) |
1. remains same 2. remains same, only if the number of tube passes does not change. 3. decreases 4. increases |
|
Use of baffles in agitators help in minimizing the __________ tendency. |
1. both swirling and vortex 2. vortex 3. swirling 4. neither swirling nor vortex |
|
In liquid-liquid equilibrium studies, a system is called type II if |
1. the A-C pair is immiscible 2. the B-C and A-B pairs are partly miscible 3. the B-C pair is completely miscible 4. A-B miscible |
|
The cross over frequency of the process which is having the transfer function of G(s) = 5/(2s+1)4 |
1. 20 2. 0.1 3. 0.5 4. 0.05 |
|
Molecularity of an elementary reaction P + Q = R + S is |
1. 1 2. 2 3. 3 4. 4 |
|
Cavitation in centrifugal pumps is caused by |
1. High fluid velocity at suction 2.low barometric pressure 3.low suction pressure 4.high suction pressure |
|
Cavitation in centrifugal pumps may be eliminated by maintaining |
1.suction pressure higher than vapor pressure of the liquid at the suction temperature. 2. suction pressure sufficiently lower than vapor pressure of the liquid at the suction temperature. 3.liquid velocity at the suction less than 0.3 ft/s 4.suction pressure less than 1 atm. |
|
consider distribution of the solute C in two partially miscible solvents A(carrier) and B(solvent). What is the selectivity of separation at the plait point? |
1. 1 2. very large 3. Zero 4. less |
|
Cooling water fouling factors vary in the range of 0.001 to 0.003. What is the SI unit? |
1. (kcal/hr. m. °C)-1 2. (W/m2.°K)-1 3. (BTU/hr.ft2. °F)-1 4. (kcal/hr.m2.°C)-1 |
|
Industrially, the process of sedimentation is conducted on a large scale in equipment called |
1.sorting classifiers 2.cyclones 3.thickeners 4.filters |
|
The Schedule number is an indication of |
1.material density 2.pipe wall thickness 3.pipe size 4.pipe roughness |
Answer all the MCQs correctly with proper explanation.
In: Other