GeekInterview.com
Series: Subject:

Chemical Engineering Interview Questions

Showing Questions 1 - 20 of 61 Questions
First | Prev | | Next | Last Page
Sort by: 
 | 

What is valency?

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

Answered by: ravi on: May 5th, 2013

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

Answered by: muralidharan on: Apr 9th, 2012

Valency is the number of free electrons present in an atom, ready to combine with other electrons in the orbit of an element. To get a more precise definition, please refer any physical chemistry books.

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: ravi on: May 5th, 2013

mass of water required to produce steam is less. steam economy is high

Answered by: anuj dev on: Feb 6th, 2013

there is two term- evaporator capacity and economy?
capacity-no. of kg of water evaporated per hour.
economy-k.g. of water evaporated per k.g. of steam feed.
both of multiple evap.(if taken for all effect) is greater than single effect. i think question is ..

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?

What is the difference between unit operation and unit process

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

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

unit operation involves in physical changes only and unit process involves in both physical and chemical changes

Answered by: ketki chaudhary on: Mar 3rd, 2013

Unit processes are hydrogenation, oxidation, nitration etc

Unit operations need to be performed in unit process like mixing, agitation, drying, quenching etc.,

Explain the designing of distillation column

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

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

the design of any distillation process involves in finding number of trays required for required separation,which is calculated by mc cabe method

Answered by: ketki chaudhary on: Mar 3rd, 2013

Distillation column separates the liquid mixtures into their components. It has two sections the upper section is called rectifying section and lower one is called stripping section. The liquid having...

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?

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: ketki chaudhary on: Mar 3rd, 2013

By using metal catalyst and using proper temperature and pressure

Answered by: rakesh kumar on: Mar 2nd, 2013

One way of increasing the Productivity / yield is to minimize the side reactions, minimizing the byproducts. This can be done by selecting proper process / catalyst if used in the process.

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.

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: BarotSaurabh on: Sep 28th, 2012

Correction of Bernoulli equation for fluid friction

Answered by: ashwakhussain on: Sep 26th, 2010

The process which involves chemical reaction is called unit process like chemical reactions, chemisorption, nitration, where as the process which involves only physical change is called as unit operation like distillation, physical adsorption etc.

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

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: Kratarth on: Aug 15th, 2012

Fluid having high specific volume must go through the shell side.High temperature and pressure stream must go to the tube side and more viscous fluid must go to the shell side.so,that the baffles impart turbulence to the viscous fluid.

Answered by: nisha on: May 15th, 2012

Fluid having more corrosive nature and higher fouling factor is passed through tube side because we can easily replace the tube after maintenance but if the shell get corroded it will be more economical to replace or maintain it.

Difference between distillation and fractionation?

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

Answered by: srinivas on: Aug 11th, 2012

if the difference between boiling points is less than 25 degrees we use fractional distillation otherwise we use distillation

Answered by: LAVANYA on: May 15th, 2012

Fractionation is used when the boiling point difference is less than 70 degree, but distillation is widely used not need this requirement..both are distillation or we can say processes of separation based on boiling point.

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

Law of thermodynamics

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

What is 3rd law of thermodynamics?

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

Answered by: adnan zafar on: Oct 4th, 2011

Absolute entropy of a perfectly crystalline solid at absolute zero temperature is zero.

Wilson equation

Asked By: Bodhisatya Das | Asked On: Feb 24th, 2009

Explain what is wilson equation?

Answered by: mohammadhosein samet on: Jun 4th, 2012

The Wilson equation was published by Grant M. Wilson as Vapor-Liquid Equilibrium. XI. A New Expression for the Excess Free Energy of Mixing

Answered by: raj kumar sitaliya on: Oct 6th, 2011

Wilson plot /equation is the graphical calculation of convective heat transfer coefficient is proportional to Uexp 0.8.

Chemical software

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

What is the role of software in process equipment design and what software should one refer to while dealing with related problems?

Answered by: kishan vadariya on: Jun 1st, 2012

Software's or u can say simulators are used mainly to get simulated results of many parameters like product composition, pressure, temperature, mole-mass fraction etc. this results will most probable ...

First | Prev | | Next | Last Page

 

 

Ads

Connect

twitter fb Linkedin GPlus RSS

Ads

Interview Question

 Ask Interview Question?

 

Latest Questions

Ads

Interview & Career Tips

Get invaluable Interview and Career Tips delivered directly to your inbox. Get your news alert set up today, Once you confirm your Email subscription, you will be able to download Job Inteview Questions Ebook . Please contact me if you there is any issue with the download.