tab3an el so2al el taklede mashro3k kan 3an eh w ersemhole w yhrek as2elh

feh ?

ya3ne eh temperature?

ersmle distilation column w el products ele btetla3 mn el distillation of

petrol ?

ya3ne eh fluids?

types of pumps w el far2 mabenhom ?

definitions : octane number,Dew point, bubble point, gross heating value,

net heating value, control loop 3la distillation column, cavitation, shut off

head,pump run out, Adsorption, types of absorption,Leaching,liquid liquid

extraction and how to choose a pump.

type of steam used in reboiler for distillation column? and why?

What is the difference between PFD & P&ID ??

The PFD shows the basic equipment and process streams and how the

process will be controlled, by indicating the required controls. As the

process diagram is further detailed, PFDs are translated to P&IDs. P&IDs

show in details the equipment, piping, valves (manual, motorized),

instrumentation, process control and emergency shutdown devices. PIDs do

not only include all lines, instruments, valves required during normal

operation, but also the ones required for maintenance, plant start-up and all

operating cases.

type of flow?? type of fluid? and what different between them? sketch

relation between flow strain and flow stress in Newtonian fluid and indicate

the relation between them? and what 's name of these relation?

what is the difference between condenser and cooler ??? what is the

difference between total condenser and partial condenser ??? what does

MSDS stand for ??? definition of weeping and entrainment in columns and

how to solve these problems ??? what does DCS stand for ??? what does

SCADA mean ??? what are the chemicals added to BFW ( boiler feed water

) ??? what is the definition of flash point ??

What is your graduation project ? explain and draw ?

Discuss & define in detail ( mention types and units if exist):

1. Temperature , pressure , vapor pressure , viscosity , flash and fire

point , pour point , octane and cetane number , TBP , ASTM Dist.

2. Ideal gas law , laws of thermodynamic , critical point , critical

temperature , critical pressure, cricondentherm & cricondenbar ,

retrograde phenomena , Dew point, bubble point, gross heating value,

net heating value

3. weeping and entrainment in columns and how to solve these problems

?

4. characterstic curve

5. Hydrates (factors affect on it) and how to prevent ?

6. Separator internals

7. Cavitation

8. Natural Gas sweetening process (with drawing)

9. Adsorption, absorption, Leaching, liquid liquid extraction

What is the functions of:

1. Separators

2. Crude oil desalter

3. fractionator , strippers , preflasher exist in Dist. units

mention the types of :

1. pumps and compressors

2. heat transfer equipments

3. valves

4. reflux , tower trays

5. separators (Draw and mention Adv. and Dis. of each)

6. fluid flow in pipelines

7. storage tanks

8. Fired heater (5 classifications)

9. fluids flow

10. steam used in stripping for distillation columns ? and why ?

what is the difference between:

1. Condenser and cooler ?

2. total condenser and partial condenser ?

3. process and operation ?

4. boiler and reboiler ?

5. Reid vapor pressure and True vapor pressure

what each of following stand for ?

1. DCS , SCADA

2. MSDS

3. PFD & P&ID

4. PIC , FIC , TI , LS , LR , LC , PRC

5. MMSCFD

6. ASTM , ASME , NACE , API Code

What is ??

1. natural gas dehydration methods

2. components of triangle of fire

3. Bernoulli equation , Darcy equation

4. pump run out , Shut off head

Complete:

1. Q = U * …. * ∆Tlm

2. API =141.5/(….) -131.5

3. Furnace efficiency =

4. Pump efficiency =

Describe & draw a main fractionation tower for crude oil showing its control

loops ?

Give some notes on process control and Instrumentation ?

Some Chemical Engineering interview questions - answers compiled here.

1. Any idea on recombinant protein expression?

2. Are carbon steel storage tanks appropriate for NaOH solutions?

3. Are fin tubes necessary for steam heating a liquid?

4. Cetane no. and sulphur required in diesel fuel for euro-IV

5. Do you have recombinant protein expression experience? Explain?

6. Explain the Deacon reaction?

7. Explain various protein purification techniques?

8. For a centrifugal pump if the pump is running and we close the

discharge valve what is the effect

9. How are plate heat exchangers used in an ammonia refrigeration

system?

10. how can we derive power factor equation p=vi cos phi? derivation?

11. how can we measure entropy?

12. how FOULING effectd the heat transfer rate

13. How much experience you are having in commercial software for

protein design?

14. how much maximum power can be generated by 320v, 10kg-cm

synchronus motor if shaft is roteted mechanically at 50 to 60 rpm?

15. how to calculat suction head in centrifugal pump?

16. How to calculate the release flowrates from pressurized gas systems?

17. How to calculate the sonic velocity of a gas stream?

18. How to determine the particle size distribution for a given bulk solid?

19. How to estimate the efficiency of a pump?

20. Is it possible to compare the resistance to chloride attack of several

materials of construction?

21. Is petroleum a mixture of hydrocarbon?

22. Name of the fraction at which benzene xylene and toulene is obtained

during coal tar distillation

23. Thyristor related applications

24. What are some good estimates for heat transfer coefficients for coils

in tanks?

25. What are the affinity laws associated with dynamics pumps?

26. What are the effects of oils on the properties of Polyolefins?

27. what are the precautions u are taking while starting HT motors?

28. What are the steps involved in w.ine making?

29. What can cause bulk solids to stop flowing from a bin?

30. What compounds are responsible for the odours that come from

wastewater treatment plants?

31. What does the catalystic converter on an automobile do?

32. What is a good estimate for the absolute roughness for epoxy lined

carbon steel pipe?

33. What is are the main terms in Unit Operations? and what is its

charecteristics?

34. What is difference between Overall heat transfer coeficient &

individual heat transfer coefficient

35. what is load and what are the types of load?

36. what is meaning of pid how it is useing controlers

37. What is microstir?

38. What is Pinch Technology?

39. what is the apt definitions for apparent power ,active power and

reactive power?and explanation about different types of lamps?

40. what is the differance between Horizental and vertical heat

exchanger?

41. what is the discharge pressure formula, for calculating discharge

pressure?

42. What is the ignition temp. of Alluminium,Coper & Iron.

43. What is the ignititon temprecher of Diesel,Petrol & Carosion oil.

44. What is the Import Procurement Cycle ? and what are the

customization steps in SAP ?

45. what is the meaning of flaring

46. What is the most common cause of solid size segregation in bulk solid

systems?

47. what is the purpose of capacitor? and capacitor load means what? how

does it connect?

48. What is the reason for removing silicon from aluminum?

49. What is the speed of a rotary drier

50. What is the symbol of sodium ?

51. What is the various utilities of the process plant?

52. What is unit operation?

53. What regulates, or gives a substance the viscosity it has?

54. What steps can be taken to avoid stress corrosion cracking (SCC) in

steel vessels used for storing anhydrous ammonia?

55. Which is more effective , a single extraction with a large volume of

solvent or several small volume extractions? Explain.

56. Which reformer efficiencywise best?

57. Which thing is responsible for making petroleum?

58. Why is post-weld heat treatment sometimes necessary for welded

vessels?

59. Why is steam added into the cracker in thermal cracking?

1. For a given bulk solid how can the particle size distribution be

determined?

In order to determine the particle size distribution the simplest method is to

make use of a sieve stack. In this method a stack is created of with different

mesh sizes at each stack level. The structure is such that the biggest mesh

size is at the top and the smallest at the bottom. Once this setup is created the

before beginning the weight and other values of the solid is noted down.

Once this is done the solid is placed at the topmost cylinder and the entire

setup is exposed to a combination of vertical and horizontal movements.

This will make the solid pass through different mesh sizes in the process

separating the different particles according to their sizes. There are other

more advanced methods of determining the particle size distribution as well

such as video imaging and laser diffraction as well.

2. What are the different characteristics that can affect the flow of

bulk solids and how?

The main characteristics that can affect the flow of bulk solids are as

follows:

> Moisture Content: when the moisture content is high the bulk solids

become sticky in nature. This moisture can sometimes be absorbed from the

atmosphere by some solids.

> Temperature: The flow of the bulk solids can be sometimes affected by the

temperature and also the period for which it is exposed to a particular

temperature.

> Particle size: More cohesive particles are generally found in bulk solids

that are finer. Round particles are handled easily in comparison to odd,

unsymmetrical shapes.

> Time at rest: Many times the flow of certain bulk solids is affected by the

time for which it has been kept stagnant or at rest. The more it is kept at rest

the more slow the bulk solid flows.

3. What do you understand by Wet bulb Globe temperature?

The wet bulb globe temperature index is used to measure the sultriness of

the environment. The sultriness is calculated on the basis of the humidity

affects, the air speed and temperature and also the sun`s radiant heating

factor. The sultriness in some cases could be fatal and hence it is very

important to keep this under consideration. The wet bulb globe temperature

index number was developed in the 1950`s and is now accepted as an

industry standard. It is comprised of three temperature readings:

> Wet bulb temperature

> Ordinary dry bulb temperature

> Black bulb globe temperature

4. In case of welded vessels why is stress relieving in the form of

post-weld treatment necessary?

When a metal is welded together the point at which the two surfaces are

joined are subjected to very high temperatures. During this time period the

metals can go through a lot of random metallurgical processes. This causes

the metal to be harder and brittle. This depends on the amount of carbon

content. In order to relieve the metal of these properties heat treatment is

done on the affected areas. By doing so the affected areas ductility increases.

In this process the heat is maintained in the affected metal according to the

thickness of the metal. The temperature of the heat is calculated from the P

number which is unique for a particular composition.

5. What significance the angle of repose holds in the chemical

industry, Explain?

The angle of repose is a property of particulate solids. A conical pile is

formed when a bulk solid is poured onto a flat surface. The angle formed

between the flat surface and the pile edge is called the angle of repose. The

angle of repose depends on the following factors:

> Density of the material

> Surface area

> Coefficient of friction of the material

A material having a low angle of repose would always create float piles as

compared to materials with a high angle of repose. This is used in the

designing of equipments which are used for particulate solids. In addition to

that this angle can be used to calculate the size of the conveyor belt that is

used to transfer the materials.

6. What are the design considerations for a piping system for the

transfer of slurries?

The following points must be considered for designing a piping system to

carry slurries:

> The design of the piping system should be able to self drain.

> At the sections of the pipe where self draining is not possible provision to

install manual draining must be installed.

> At certain points where the chances of plugging are high, rod-out or blow-

out connections must be provided to clear the lines.

> In order to make flushing possible clean-out connections should be

installed on either side of the main valves.

> For easy access all the manifolds should have flanged connections.

> T-connections are a must for access flanges.

7. 7. What are the problems that are associated with the expansion

joints?

Expansion joints are said to be weak points that are used in piping. They are

used to reduce the stress that comes in the piping while installing and

implementing it. This allows minor piping to be settled during the joining

function. Expansion joints can’t stand the stress that is being produced by

the piping forces. The problems that have been given are as follows:

>Expansion joints get dirty very easily and they tend to build up as the time

progresses.

>They include some weak points that can`t stand the stress of the piping.

>The issues can be removed if the drains are installed properly and purging

of the material is being done.

8. 8. What is the method involved in analyzing powders for

composition?

The method that is used to analyze powders for compositions called as

Fourier transform-infrared spectroscopy. This method is widely used to send

the light beams of varying wavelength passing through the sample that is

given and the light that is reflected from there will be analyzed by

spectroscopy. This method is used to find out the absorption of each

wavelength. The wavelength is measured with the laser light that is being

referenced and on the basis of that calculations will be performed. The

method is adopted to measure the compositions with accuracy.

9. 9. What are the methods involved to test helium leak testing in a

vacuum system?

The helium gets detected when it is found in the location of suction line. The

helium source is passed over the flanges and possible sources of leakage in

the vacuum system. The monitoring of the system takes place to see the

detector and the pump suction to be found for the detectable amount of

helium. The pressure can be increased or decreased according to the

environment. If the system is allowing the pressure and the vacuum at the

same time then more pressure can be applied to set the leaks. An installation

of IR unit can be done to suction the substance of the pump and the spraying

will be done on the flanges.

10. 10. What are the criteria’s involved in choosing mass balances for

components?

The mass balances are used to combine all the masses that are present in the

substance and create an overall effect when it is combined with other factors.

The equations can be set for the component to allow any of the components

used in mass balances. The criterions on which the balances are dependent

are as follows:

> Need to find out which component(s) are involved in solving the

equations, without proper information the equation can`t be solved.

> Find out about the components about which the reasonable assumptions

can be made. By doing this the process gets simplified and it will help in

making quick calculations.

11. 11. What are the assumptions made on conservation equation?

The conservation equation is applied to the property of the system. It can

have complicated as well as easy to solve calculations:

> Closed system: that doesn`t have flows out of the substance. It deals with

the closed mass flow. The equation to calculate this is:

Accumulation= Generation

> Open system: that allows the substance to enter or leave the system.

> Conserved state system: in which no generation of the quantities happens.

The quantities in this doesn`t get created or destroyed. These quantities are

useful to balance according to the users need.

> Steady State system: in which no accumulation of the substance is in

steady state. This system avoids having differential equations. The process

needs to be validated before it can run in any state.

12. 12. What is the procedure to estimate the friction factor involved

in heat exchanger tubes?

The following procedure is involved in determining the factors used inside

the heat exchanger tubes that are varying with the temperatures. These are as

follows:

>Determine the average of the temperature by taking the mean of all the

temperatures stored in the processing line.

>Check the condition of the fluid entering the line at around 300 Celsius and

leaving at around 280 Celsius.

>Determine the physical properties at the temperature of 290 Celsius and the

friction factors of the tubes at the same temperature.

>Use the formula to calculate the friction factor of the laminar flow in the

case where the liquid is cooling:

Mean temperature/((sum of viscosity/wall viscosity)*0.38)

Where Bulk and wall is determined at mean temperature over the length of

line.

Use the formula to calculate the friction factor of the turbulent flow in the

case where the liquid is cooling:

> (Mean temperature + bulk properties / ((sum of viscosity/wall

viscosity)*0.11))/(bulk viscosity/wall viscosity)*0.17

13. 13. What is the use of gear pumps in motor?

Gear pumps uses meshing gears that allow the pump fluid to be displaced by

the method of displacement. They are used for hydraulic fluid power

applications. They are one of the key factors involved in chemical

installation having a certain viscosity to pump fluid. This type of pumps uses

positive displacement pump having high pressure and low capacities. This

includes the ability to handle wide range of viscosities, and allow easy to

build and maintain the pumps. The gear pumps are controlled through the

motor speed. Gear pumps can’t handle high tolerances and the fluids that are

free of abrasives.

14. 14. What are the factors involved in considering the choice of dry

screw compressor?

Screw compressors are made up of a pair of meshing helical screws that is

used to compress the gases. The dry screw compressors are used to have a

flow range of 85-170 m/h and the discharge pressure is of 2070-2760 kPa.

The dry screw compressor consists of timing gears that is maintained aligned

with the rotors. The effectiveness is dependent on the clearances that exist

between the helical rotors and between the chambers used for sealing the

compression cavities. They are compact and smooth having the limited

vibration and require spring suspension as well.

15. 15. What is the process of including heat exchangers in ammonia

refrigeration system?

The heat exchangers are used in ammonia refrigeration system from a very

long time. The heat exchanger used is having smaller sizes and they are

equivalent to the tubular exchanger can. This process works best for flooded

system that require a separate liquid from the vapor. The system that is

explained consists of a vessel, a drum, and accumulator and header tank with

the heat exchanger. It works like this:

>Liquid ammonia moves from vessel to exchanger

>Vapor is returned to middle of drum

>Vapor is removed from the drum and liquid enters through exchanger as it

has lower density than others entering at the same rate in the system

16. 16. What is the method adopted to minimize shell side pressure

drop in a shell?

The method of protecting the shell from the pressure drop is very essential as

it is very critical stage, where if not taken care properly the shell has to be

replaced due to its degradation. In this rods or tube protectors are used

instead of plates in top rows. The use of these rods puts less pressure drop

and provides better distribution of the pressure on the plate. The plate that is

used causes an abrupt of 90 degree turn of shell stream and an extra pressure

drop on the whole shell. Use of the tube protectors will allow the shell to be

saved from this and maintains its longevity.

17. 17. What are the strategies acquired to cure tube vibration and

exchangers in a shell?

The strategies that can be followed are as follows:

>To cure the tube vibration uses the tubes that doesn’t allow passing of the

flow-induced vibrations through them and are longer in height than others.

Usually the tubes supported

>Are of 3-4 inch. To make the bundle stiff insert metal slats and rods

between the tubes that is used in the process.

>Add a shell nozzle opposite of the inlet to cut the flow of the velocity of the

fluid in half. This solution works for non-removable bundles that can easily

be solved also by adding a distributor belt on the shell. This might be

expensive solution to adopt as it requires more man power and use of more

tubes.

18. 18. What are the factors involved in designing kettle type

reboiler?

To design the kettle type reboiler the requirements that needed to be present

are as follows:

>The size of the kettle has to be determined.

>Provide the space to slow down the vapor velocity of all the liquid droplets.

>Deciding the destination where the vapor would be deposited.

>Handling a distillation tower with the following property: large space, high

efficiency and high reflux rate.

>The height of the vapor space should be kept such that the differences in

the temperature won’t affect the kettle.

There should be high heat flux for the kettles that run on higher

temperatures.

19. 19. What are the steps taken to operate a tank-blanketing valve?

The steps taken are as follows:

>Tank blanketing valves provide a way to prevent and control the fires in

the flammable liquid storage tanks.

>The vapors that are produced cannot be ignited if there is no supply of

oxygen present at that time.

>The oxygen in most of the cases being provided by the air that is drawn

into tank from the atmosphere when the empty process is taking place.

>Install tank blanketing valves with inlet connected to the inert gas that is

kept under the pressure. And the tanks outlet is being placed in vapor space.

>The pressure drop is happening in the tank at predetermined level where

the blanketing valve allows the transfer of gas into vapor space.

20. 20. What are the steps required to design a vapor-liquid separator

or flash drum?

The steps that are required are as follows:

> The size of the vapor-liquid separator depends on the flow rate of vapor

and the liquid that is coming out of the vessel.

> Assumed from the flow rates that if they are known then the size can be

found out.

> Use vertical pressure vessel to set it up or install it at given location.

> The length to diameter ratio will be taken to provide liquid inventory

between the level of liquid and the bottom of the vessel.

> Provide a blockage mesh section at the vapor outlet to let the vapor pass

through the mesh that is taken and can successfully leave the vessel.

> Let liquid flow control the level of the valve.

21. 21. Why does catalytic converter used in an automobile?

The catalytic converter is a device that converts harmful compounds in

harmless compounds. The compounds harmful in nature are as follows:

> Hydrocarbons- this is in the form of unburned gasoline that creates

pollution and is more harmful.

> Carbon monoxide is very harmful gas formed by the combustion of

gasoline and used mainly for fuels.

> Nitrogen oxides is also one of the gases that is poisonous in nature and

produced by the release of heat from the engines. The release of nitrogen

from the engine gets mixed with the oxygen in the air.

The catalyst converter takes these harmful gases and uses the catalyst that is

coated on the ceramic honeycomb or beads and attached to the exhaust pipe.

This converts the carbon monoxide in carbon dioxide and makes it easy for

the nature to consume it. The hydrocarbon gets converted in carbon dioxide

and water. Same way the nitrogen oxides also gets converted in nitrogen and

oxygen.

22. 22. What are the different ways in which solids can be blended?

There are various ways in which solids can be blended, some of the common

methods are:

> Convective mixing: In this type of mixing the group of particles of a solid

is transferred from one place to another, vigorous repositioning takes place

in this method. This type of mixing is prevalent in the Trough mixer.

> Diffusion mixing: In this type of mixing a new interface is formed over

which the particles of a solid are distributed. A good example of diffusion

mixing is in the traditional barrel mixer, where a new interface is formed.

> Shear Mixing: In this type of mixing slipping planes are created over

which the group of particles of a solid are mixed.

23. 23. What are the different types of equipments for the conveyance

of solids?

The various types of equipments available for the conveyance of solids are

as follows:

> Gravity Chutes: This equipment relies on gravity for the solids to fall

under.

> Air Slides: In this equipment the particles are suspended in air, and flow at

an angle to the horizontal.

> Belt Conveyors: This equipments use a belt to transfer the solids.

> Screw Conveyors: The solids are moved using a rotating helical impeller.

> Bucket elevators: The solids are moved using buckets which are attached

to a belt in motion.

> Vibrating Conveyors: The solid particles are subjected to vibrations and

travel over to a table in a series of steps.

> Pneumatic/ Hydraulic Installations: The particles are transported over a

stream of air or water.

24. 24. What are the reasons of removal of particles from effluent

gas?

The main reasons for the removal of particles from effluent gas are:

> In order to protect and maintain the health of the workers and operators in

the plant. It is also done to protect the surrounding population. The primary

danger is due to the inhaling of the dust particles which can cause health

issues.

> It is also done to minimize the chances of explosions. Many carbonaceous

materials remain suspended in air and when mixed with finely powdered

metals can form a highly combustible mixture.

> Particles are also removed to reduce the loss of valuable materials.

> It can also be used to recycle the gas for ex in case of blast furnaces the

gas is used to fire the stoves.

25. 25. In a crusher where is the energy provided to it is used up for?

The energy fed to a crusher is utilized for the following purposes:

> To produce the elastic deformation of the particles prior to the fracture of

the particles.

> In order to produce inelastic deformation this causes the particles to reduce

in size.

> The energy is also used to cause the equipments elastic distortion.

> In the friction of the particles between themselves and between the

machine.

> The energy also gets used up in the form of heat, noise and vibration in the

plant.

> The energy also get used up in the friction losses in the plant.

Most of the energy is lost and only some of it is properly utilized. Nowadays

it is of prime importance to reduce the energy losses.

26. 26. On what basis are materials to be crushed evaluated apart

from size?

The choice of the crusher machine to be employed to crush the materials

depends on the following properties apart from the size of it:

> Hardness: The hardness affects the power consumption and the wearing of

the machine. With hard materials it is necessary to use a low speed machine

along with pressure lubrication.

> Structure: Normal granular materials can be crushed by using compression

and impact methods. On the other hand for fiber like materials compression

and impact methods don't work instead a tearing action is required.

> Moisture content: The moisture content in the materials can greatly affect

the choice of machines. In case of excess moisture the materials flow gets

hindered and it is essential to prevent them from caking together and form

balls.

> Crushing Strength: The amount of power that is required to crush a

material can be derived directly from the crushing strength of the material.

> Friability: This property indicates the tendency of a material to fracture.

> Stickiness: As the name suggests this property is used to evaluate how

sticky a material is as a very high sticky material can clog the machinery.

27. 27. What are the advantages of using a ball mill over other

conventional methods of crushing?

The advantages of using a ball mill over other conventional methods are as

follows:

> The mill can be used in multiple modes. It can be used in both wet and dry

modes. The wet mode helps in the removal of the product.

> The installation cost and the power consumption of the mill is low.

> Since the mill can be used in an inert atmosphere hence it could be used

for the crushing of explosive materials.

> It can be used for any type of hardness materials and also the grinding

medium is cheap.

> It can also be used for continuous and batch operations.

> The ball mill supports two types of grinding:

> Open circuit grinding

> Closed circuit grinding

28. 28. Mention some of the specialized grinding and crushing

methods.

Some of the specially developed grinding and crushing methods are as

follows:

> Electrohydraulic crushing: In this method an underwater discharge is

created from a high capacity capacitor.

> Ultrasonic Grinding: This type of grinding the material id placed between

a drive roll and plate both of which are ultrasonically activated. This process

is used for grinding micro sized materials.

> Cryogenic grinding: For certain materials effective grinding is not possible

by conventional means such as rubber, textiles etc. In order to cope with this

problem the material is frozen to ultra low temperatures using liquid

nitrogen. Once the material is frozen it is grounded as per requirements.

>Explosive Shattering: This type of shattering is still on experimental basis,

it involves energy to be transmitted to the particles in the form of

shockwaves from an explosion chamber.

29. 29. What are the assumptions made for Kynch Theory?

The following assumptions are made for the Kynch Theory:

> Across the horizontal layer the particle concentration is uniform

> The effects of the wall can be ignored.

> No differential settings of particles are considered due to shape, size or

composition changes or differences.

> The velocity at which particles fall depends only on the local

concentration of the particles and nothing else.

> The concentration is considered to be uniform throughout or it can be

assumed to increase towards the bottom.

> The velocity of sedimentation approaches zero as the concentration

reaches the limiting value. This limiting value corresponds to the sediment

layer at the bottom which gets deposited.

30. 30. What are the merits of using a falling film evaporator?

The advantages of using falling film evaporators are as follows:

> These types of evaporators have very high heat transfer coefficients

ranging from 2000-5000 W/m(square) for water and 500 to 1000 for organic

liquids

> The residence times are short in case of heated surfaces, 5-10 seconds

without recirculation

> They have very low pressure drops, 0.2-0.5 kN/m(square) ,

> These evaporators are well suited for vacuum operations as well.

> The evaporation ratios are very high. 70 per cent without and 95 per cent

with recirculation,

> They have a very wide operating range, they can provide as much as 400%

of the minimum throughput,

> In addition to the above advantages they have a low cost of operation and

are less susceptible to fouling

1. Do you have any idea on recombinant protein expression?

2. Do you have recombinant protein expression experience? Explain?

3. Explain the Deacon reaction?

4. Explain various protein purification techniques?

5. For a centrifugal pump if the pump is running and we close the discharge

valve what is the effect?

6. How is plate heat exchangers used in an ammonia refrigeration system?

7. How can we derive power factor equation p=vi cos phi?

8. How can we measure entropy?

9. How FOULING effected the heat transfer rate?

10. How much experience you are having in commercial software for

protein design?

11. How much maximum power can be generated by 320v, 10kg-cm

synchronous motor if shaft is rotated mechanically at 50 to 60 rpm?

12. Is it possible to compare the resistance to chloride attack of several

materials of construction?

13. Is petroleum a mixture of hydrocarbon?

14. What are some good estimates for heat transfer coefficients for coils in

tanks?

15. What are the affinity laws associated with dynamics pumps?

16. What are the effects of oils on the properties of polyolefin’s?

17. What are the precautions u are taking while starting HT motors?

18. What are the steps involved in wine making?

19. What can cause bulk solids to stop flowing from a bin?

20. What does the catalytic converter on an automobile do?

21. What is a good estimate for the absolute roughness for epoxy lined

carbon steel pipe?

22. What are the main terms in Unit Operations? What are its

characteristics?

23. What is difference between overall heat transfer coefficient & individual

heat transfer coefficient?

24. What is load and what are the types of load?

25. What are the apt definitions for apparent power, active power and

reactive power? Explain about different types of lamps?

26. What is the difference between horizontal and vertical heat exchanger?

27. What is the discharge pressure formula, for calculating discharge

pressure?

28. What is the Import Procurement Cycle? What are the customization

steps in SAP?

29. What is the meaning of flaring?

30. What is the most common cause of solid size segregation in bulk solid

systems?

31. What is the purpose of capacitor? What does capacitor load means? How

does it connect?

32. What is the speed of a rotary drier?

33. What is the symbol of sodium?

34. What are the various utilities of the process plant?

35. What is unit operation?

36. What regulates, or gives a substance the viscosity it has?

37. What steps can be taken to avoid stress corrosion cracking (SCC) in steel

vessels used for storing anhydrous ammonia?

38. Which is more effective, a single extraction with a large volume of

solvent or several small volume extractions? Explain.

39. Which reformer efficiency wise best?

40. Which thing is responsible for making petroleum?

41. Why is post-weld heat treatment sometimes necessary for welded

vessels?

42. What is happening when paint dries?

43. What is an additive?

44. What is a good source of information for the design of pressure vessels?

45. What are some of the consequences of an undersized kettle type re

boiler?

46. Explain the functioning of a three-way catalytic converter.

47. How does a tank-blanketing valve operate?

48. What does the catalytic converter on an automobile really do?

49. What is a common failure mechanism for above ground atmospheric

storage tanks?

50. What are some common precipitating agents used to remove metals from

aqueous waste streams?

51. Are there any methods of preventing cracking of carbon steel welds in

refining environments?

52. What type of flow measurement devices is best for slurries?

53. What chemical is used to expand air bags in such a short amount of

time?

What is the best way to configure a bypass line in slurry services?

من التجميعة هذه فى ساهم من لكل بالغيب الدعاء نسألكم الكيميائية الهندسة مجال فى متخصصة امتحانات و اسئلة

Get a job ISA (Chemical Engineer)

https://www.facebook.com/groups/103176979789396/ I am a Chemical Engineer

https://www.facebook.com/IamCheEng فى عمل فرصة باى الوظائف جروب فى المشاركة نرجو

البعض بعضنا لمساعدة التخصصقلبى فأطمئن غيرى يأخذه لن رزقى ان علمت