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Chemical Engineering Interview Questions

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Heat exchangers

Asked By: abhilashchakravarty | Asked On: May 30th, 2011

What is the basis of choosing the shell side and tube side fluid?

Answered by: rakesh bodakunta on: Sep 19th, 2014

If the process fluid contains salts than the fluid in shell side. because salt decompose and forms scales on surface on the inner surface of tube if we use fluid in tube side.due to this cleaning of tubes are difficult.

Answered by: VIJAYAKUMARAN on: Jul 23rd, 2014

Which fluid through tube: •High pressure fluids should be passed through tubes because tubes, having a smaller area, will withstand relatively high pressure, whereas, special shells for an exchange...

Difference between distillation and fractionation?

Asked By: nalamnaresh | Asked On: Feb 16th, 2008

Answered by: SOMRAJ on: Sep 3rd, 2014

I think, distillation and fractionation are d same process both are separating liquids based on different boiling point of diff component..but when we simply separate the mix of liquid we called this distillation but in case refineries we say it fractional distillation

Answered by: neeru srangal on: Aug 17th, 2014

Both are used to separate the components of feed mixture based on their boiling points but the key difference is:

Distillation: Used when boiling point of chemicals in mixture are significantly different.

Fractionation: Used when boiling point of chemicals of mixture are close to one another.

Unit process and unit operations

Asked By: chemienger | Asked On: Feb 10th, 2010

What is unit process and unit operations? How they are different from one another?

Answered by: kiran kumar on: Sep 3rd, 2014

Only physical change unit operation physical and chemical change unit process

Answered by: BarotSaurabh on: Sep 28th, 2012

Correction of Bernoulli equation for fluid friction

Process development

Asked By: ragib_khan | Asked On: Aug 21st, 2009

How can a chemical production engineer improve the process with respect to yield & quality?

Answered by: SUCHARITHA on: Aug 22nd, 2014

A recycle stream is one way to improve purity/quality and yield of product.

Answered by: VIJAYAKUMARAN on: Jul 23rd, 2014

chemical process engineer should observe the changes in temperature, pressure, flow and electrical load of the units to understand the changes in the process. Fugitive emission and stack emission are ...

Can bernaulli's theorem be applied on gases?

Asked By: abhi11092451 | Asked On: Feb 25th, 2011

As bernaulli's theorem is applied on fluids, so can we apply it on gases also?

Answered by: neeru srangal on: Aug 17th, 2014

Yes, bernaullis theorem can be applied to incompressible fluids (liquids) and compressible fluids (gases) in the range of low mach number (less than 0.3).

Answered by: jitendra sharma on: Jul 29th, 2014

Because BER. EQ. is used only for in-compressible fluid and gas is com.

What is physical significance of chemical potential & fugacity?

Asked By: qisomani | Asked On: Apr 29th, 2007

Answered by: neeru srangal on: Aug 17th, 2014

Chemical Potential: Change in Gibbs free energy at const T &P
Fugacity: How much chemical potential of a phase differ from its standard state and its equal to partial pressure in case of ideal gas.

Answered by: Sumaia afroz mim on: Nov 26th, 2013

1.To calculate free energy.
2.chemical potential is 1 type of force to turn a reaction in equilibrium.
3.chemical potential is comparable to escaping tendency or fugacity,its means the tendency of reaction flow to ewuilibrium point.
4.If chemical potential is high escaping tendency will high.

How to calculate freezing point of a blend of two mixtures with known freezing points,compositions mathematically?

Asked By: dedoooo | Asked On: May 6th, 2013

Suppose I have two hydrocarbon mixtures ,each mixture has known composition & freezing point , is there any empirical formula to calculate the freezing point of a blend of those mixtures?

Answered by: neeru srangal on: Aug 17th, 2014

delta T = (Freezing point of pure solvent) - (Freezing point of solution) = kf * m
m= molal conc of solution (moles of solute/ kg of solvent)
kf = freezing point depression constant

Answered by: Debu on: Feb 7th, 2014

Antoine eq may be used for find out temp if vapor pressure is known for both substance ..then average of that may be answer .

What is the difference between unit operation and unit process

Asked By: nageswararao are | Asked On: Jun 6th, 2007

Answered by: Akshay Dhere on: Aug 11th, 2014

Unit process involves principle of chemical conversion leading to synthesis of various useful products.
Unit operation involves the physical separation of product obtained during various unit processes.

Answered by: kansagara ravi on: Aug 5th, 2014

Unit operation means physical change & unit process means chemical change.

Why the efficiency of multiple effect evaporate is less then single effect evaporater

Asked By: hemant raj patel | Asked On: Dec 9th, 2006

Answered by: Nabeel on: Aug 8th, 2014

Efficiency of an evaporator is given as : mass rate of vapors formed / mass rate of feed. Since in single stage evaporator there is greater LMTD as compared to the a multiple effect evaporator (of al...

Answered by: Debu on: Feb 7th, 2014

Efficiency = amount of water evaporated per unit heat supply ...when we use multiple h.e ,content of water in exchanger is continuously decrease so efficiency decrease :) 

Explain the designing of distillation column

Asked By: narender sharma | Asked On: Sep 14th, 2007

Answered by: Rupesh mandloi on: Jun 30th, 2014

Design of distillation column job is very difficult to other work, in the designing of distillation column first find out vapour velocity ( vapour velocity V=1.2/(density of mixture)^0.5 then find molecular wt of gas and then find column dia. by D=0.0164(V)^0.5(Mol.wt of gas/molar density)^0.25

Answered by: Chemical Engineering Galaxy on Facebook on: May 10th, 2014

design of distillation column have the following steps... 1.specifying the feed and product specification. 2.choice of operating conditions like pressure or temp 3.choice of column whether it is pack...

What is valency?

Asked By: Kishan Busa | Asked On: Apr 4th, 2012

Answered by: Abdelgawad on: Mar 31st, 2014

A property of atoms or groups, equal to the number of atoms of hydrogen that the atom or group could combine with or displace in forming compounds

Answered by: ravi on: May 5th, 2013

The free electrons present in the last orbital of an element.

Law of thermodynamics

Asked By: azeemravian | Asked On: Mar 12th, 2009

What is 3rd law of thermodynamics?

Answered by: jitendra patil on: Feb 15th, 2014

Value of absolute entropy

Answered by: priyasharay on: Jun 8th, 2012

If 2 systems A & B are in equilibrium with one another , and if B and C are in equilibrium , then it can be concluded A and C are also in equilibrium with one another

Activity vs. Partial pressure

Asked By: n.s.suresh | Asked On: Sep 4th, 2008

Why activity is so useful than considering partial pressure in thermodynamics point of view?

Answered by: sekhar reddy on: Apr 1st, 2013

A=f/p,activity coefficient describes the deviation in ideal behavior of any liquid when it a non ideal mixtures ,which is dimensionless

Answered by: nandha.rajesh on: Feb 19th, 2010

I think activity means activity coefficient if it is that then it it is very easy to answer your question. Generally partial pressure term is used when there is mixture means more than one compund is ...

Heat transfer

Asked By: anuragdhupiya | Asked On: Mar 15th, 2009

You have two layer of material to provide insulation. They have heat transfer co-efficient (k1>k2).How will you obtain better insulation?

Answered by: E Smardy on: Mar 22nd, 2013

I dont think you can generalise this problem - at least not for flat plane and cylindrical co-ordinates. It really depends on how much bigger k2 is relative to k1 and how big the pipe thickness is relative to the diameter.

Answered by: Affwan Hassan on: Jul 8th, 2011

I do have a question here, If the material of lower insulation be bounded to the first system, doesn't that result in heat loss?

How to conduct the vapor-liquid equilibrium (vle) experiment at atmopheric pressure?

Asked By: Emma89 | Asked On: Nov 16th, 2012

Anyone can help me to explain how to conduct the vle experiment for propane and heptane compostion? It is possible to use normal stirring extraction method for the experiment? And how much amount of heptane and propane that should I use if I choose the temperature range of 0-60 degree celcius?

Answered by: Deepak on: Feb 22nd, 2013

The vapor liquid equilibrium can be determined by their relative volatility and the X-Y values and with these values we make a graph curve on between these two values the vapor liquid equilibrium is achieved.

How to conduct the vle experiment at atmospheric pressure?

Asked By: Emma89 | Asked On: Nov 16th, 2012

Anyone can help me to explain how to conduct the vle experiment for propane and heptane composition? It is possible to use normal stirring extraction method for the experiment? And how much amount of heptane and propane that should I use if I choose the temperature range of 0-60 degree celsius?

How to conduct vapor liquid equilibrium experiment?

Asked By: Emma89 | Asked On: Nov 16th, 2012

Can I know how to conduct vapor-liquid equilibrium (vle) experiment for propane-heptane? How many ml of propane and heptane that I should use to perform vle graph? And it is possible to use normal stirring extraction method to obtain the vle graph? anyone can help me to describe the whole experiment...

Use of dyes to differentiate chemicals

Asked By: alr296 | Asked On: Oct 12th, 2012

Are there any volatile, no residue dyes that can be mixed in acetone, denatured alcohol, or isopropyl alcohol to serve as a quick GLace indicator of what the chemical is? For example, blue could be associated with acetone, red-denatured, and green isopropyl.

How to design distillation column?What is the role of chemical engg. In technology transfer in pharma company.

Asked By: sachin d. chaudhari | Asked On: Jul 25th, 2007

Answered by: srinivas on: Aug 30th, 2012

Scale up the product as per our plant capacity, check for utility requirement, check for availability of equipments, PFD, P&ID preparation, hazard study

Why it takes more time to distill out water than toluene?

Asked By: satya | Asked On: Nov 13th, 2011

Answered by: rajeev on: Jul 26th, 2012

In case of azeotrope only alternative is through azeotropic distillation ... extractive distillation s used when relative volatility is close to 1 and no of tray reqd r high

Answered by: priyasharay on: Jun 8th, 2012

B.p of water is 100C b.p of toluene is 110C , they will form azetropes , so i would go for azetropic distillation or maybe extraction

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