22311 · 2019. 8. 23. · 22311 11819 3 hours / 70 marks seat no. p.t.o. instructions – (1) all...

22311118193 Hours / 70 Marks Seat No.

P.T.O.

Instructions – (1) All Questions are Compulsory.

(2) Illustrate your answers with neat sketches wherever necessary.

(3) Figures to the right indicate full marks.

(4) Assume suitable data, if necessary.

(5) Use of Non-programmable Electronic Pocket Calculator is permissible.

(6) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall.

(7) Use of Steam tables, logarithmic, Mollier’s chart is permitted.

Marks

1. Attempt any FIVE of the following: 10

a) Name the salts which causes the temporary and permanent hardness in water.

b) Define enthalpy of saturated steam.

c) Give the uses of compressed air (any four)

d) Define ton of refrigeration.

e) Give any four properties of ‘‘R-22’’.

f) Define wet bulb and dry bulb temperature.

g) Define:

(i) absolute humidity

(ii) relative humidity

22311 [ 2 ]Marks

2. Attempt any THREE of the following: 12

a) Give the reactions that take place with hard water in Hot lime soda process. (any four)

b) Sketch and explain the working of water level indicator.

c) Explain the process of getting compressed air using flow sheet.

d) Explain the working of induced draft cooling tower with neat sketch.


a) Explain the following and give methods to prevent it.

(i) Priming and foaming

(ii) Caustic embrittlement

b) Explain zeolite method for water treatment with neat sketch.

c) Sketch and explain the working of thermic fluid heater.

d) Explain duties of inspector for Boiler. (any four)


a) Explain ion exchange process for hard water treatment.

b) Draw a neat labelled diagram of Bab Cock and Wilcox boiles. State its advantages.

c) Give the use of the following:

(i) Steam trap

(ii) Economizer

(iii) Pressure reducing valve

(iv) Preheater

d) Explain the working of air compressor

e) Distinguish between compressed air, process air and instrumental air. Give the advantages of multistage compression (any two)

22311 [ 3 ]Marks

5. Attempt any TWO of the following: 12

a) Explain vapour absorption refrigeration cycle.

b) Give the classification of refrigerants. List the selection criteria for refrigerants. (any four)

c) A barometer reads 750 mm of Hg. The dry bulb temperature is 33°C and wet bulb temperature is 23°C determine:

(i) Relative humidity

(ii) Dew point temperature


a) Define coefficient of performance (COP). A refrigeration system is operated between 40°C and – 15°C. The capacity of machine is 10 tonnes. Calculate COP.

b) Explain construction and working of hot lime soda process with neat sketch.

c) Explain Indian Boiler Act regarding following points:

(i) Boiler registration

(ii) Renewal of certificate

(iii) Transfer of Boiler

(iv) Penalty

(v) Boiler repair and maintenance


P.T.O.


(2) Answer each next main Question on a new page.






(8) Use of Steam tables, logarithmic, Mollier's chart is permitted.

Marks


a) Define temporary hardness and permanent hardness.

b) Define enthalpy of dry saturated steam.

c) List out types of steam.

d) Define refrigeration and state the unit of refrigeration.

e) Draw reversed carnot cycle of refrigeration.

f) State the principle of cooling towers.

g) State the working principle of humidifier.

22311 [ 2 ]Marks


a) Differentiate between hard water and soft water. (any four)

b) 50 kg of steam at 5 bar pressure has one kg of water in suspended form. What would be the condition of steam in terms of dryness fractions. Find the enthalpy of water using steam table.

c) Explain with sketch the working of cyclone separator.

d) Compare between water tube boiler and fire tube boiler (any four).


a) A sample of hard water contains 1 mg CaCl2 and 1 mg MgCl2 per litre. Calculate the total hardness of water in terms CaCO3 present in per 10

6 parts of water.

b) In ion exchange method of water treatment. After a certain period of time the ion exchange resin bed exhausts. State and explain the remedial action in this case.

c) Explain the construction and working of thermic fluid heater with a neat sketch.

d) Draw a well labeled diagram of electrostatic precipitator.


a) Describe the cause of caustic embrittlement. State and explain preventive measures to be taken to prevent caustic embrittlement.

b) State and explain the duties of boiler inspector.

c) State the type of Lancashire Boiler with respect to tube side passage of fluid. Draw its well labeled diagram.

d) State and explain the applications of process air in chemical industry.

e) State any two uses each of:

(i) Scrubber

(ii) Air dust collectors

22311 [ 3 ]Marks


a) With a well labeled block diagram explain the vapour absorption refrigeration cycle.

b) State types of thermic fluid and select relevant thermic fluid for given temperature range.

c) Assume that the outside air temperature is 32°C with a relative humidity ψ = 60%. Use psychrometric chart to determine

(i) The specific humidity (ω) (omega)

(ii) The enthalpy (h)

(iii) The wet-bulb temperature (Twb)

(iv) The dew point temperature (Tdp)

(v) The specific volume of dry air (v)


a) Represent air refrigeration cycle on PV and TS diagrams.

b) Explain the principle, construction and working of a dehumidifier. With a well labeled diagram.

c) Identify various boilers problems due to given boiler feed water, and discuss priming and foaming.


P.T.O.








Marks


a) Define Energy Policy.

b) List any four applications of solar energy.

c) Define commercial and non commercial energy sources.

d) List any four instruments used for energy Audit.

e) Define Economics.

f) List the types of market.

g) List various types of costs with example.

22312 [ 2 ]Marks


a) Explain the construction and working of solar water heater.

b) Explain importance of energy conservation in chemical industry.

c) Explain the importance of clean energy technologies.

d) Explain depreciation and list methods of depreciation.


a) Describe any four duties and responsibilities of Energy Manager.

b) State any four environmental benefits of wind energy.

c) Explain the construction and working of fixed roof bio-gas plant.

d) Classify new energy sources with their industrial applications.


a) Explain detailed energy audit.

b) Describe commercial and Non-commercial energy with example.

c) Illustrate the benefits of hydrogen energy as a future energy.

d) Explain construction and working of solar flat plate collector.

e) A fluid heater having capacity of 5 MW uses furnace oil as a fuel. Calorific value of oil is 10,500 Kcal/kg. Calculate mass flow rate of fuel oil.


a) Describe the concept of excise tax and income tax.

b) Explain law of demand and law of supply.

c) It is desired by the firm to borrow Rs. 2 lakh to make a financial obligation the money can be borrowed from a loan agency at a monthly interest rate of 3%. Determine total amount of principle plus simple interest due after 2 years if no intermediate payment are made and effective interest rate when interest is compounded monthly.

22312 [ 3 ]Marks


a) Describe the concept of cost, total cost, fixed cost, variable cost, direct cost and indirect cost.

b) Explain concept and types of interest.

c) A heat exchanger cost Rs. 50 lakhs is fabricated in India, the exchanger is estimated to have useful life of 10 years and a salvage value of Rs. 5 lakhs if the same unit is imported, it shall cost Rs. 150 lakh and would have an useful life of 20 years and a salvage value of 40 lakhs. Suggest the better option of among two options for purchase of heat exchanger. (I = 8% Pa)








Marks


a) Classify energy sources.

b) Write four application of biomass energy.

c) Write two importance of energy conservation.

d) Write the types of energy audit.

e) Define the terms:

(i) Total cost

(ii) Fixed cost

f) Describe the concept and types of market.

g) Define simple interest and compound interest.

P.T.O.

22312 [ 2 ]Marks


a) Explain the energy policy for a chemical plant.

b) Describe the concept of solar energy with a neat sketch.

c) Explain energy conservation methods for the industrial application.

d) Describe the advantages and disadvantages of pay out period method.


a) Explain the construction and working of any one type of biogas plant.

b) Define depreciation. Explain concept of depreciation and write the factors affecting depreciation.

c) Describe the duties and responsibilities of energy manager.

d) Distinguish between solid fuel and liquid fuels with example.


a) Explain gross calorific value (G.C.V) and net calorific value (N.C.V).

b) Write the benefits of solar energy and Biomass energy.

c) Describe environmental benefits and problems of wind energy

d) Classify energy audit based on procedure and explain walk through audit.

e) Distinguish between commercial and non commercial energy.


a) Describe the concept of different type of taxes (any three).

b) Write the applications of:

(i) Coal

(ii) Petroleum product

(iii) Natural gas (any six applications).

c) Write any type of a balance sheet. Explain how it is prepared.

22312 [ 3 ]Marks


a) Describe:

(i) Law of demand and supply

(ii) Methods of measurement for demand and supply.

b) Write different methods of calculation of depreciation. Explain any one of them.

c) Describe different factors affecting cost estimation and their effect on it.

22313

[1 of 3] P.T.O.

11819 3 Hours / 70 Marks Seat No.

Instructions : (1) All Questions are compulsory.

(2) Illustrate your answers with neat sketches wherever

necessary.



(5) Use of Non-programmable Electronic Pocket Calculator is

permissible.

(6) Mobile Phone, Pager and any other Electronic

Communication devices are not permissible in

Examination Hall.

Marks

1. Attempt any FIVE of the following : 10

(a) Define sphericity. State its equations with all terms.

(b) Give the statement of Kicks law with its equation.

(c) Define capacity & mesh number.

(d) Define the terminal settling velocity of a solid particle.

(e) Give the principle working of fabric filter.

(f) State the importance of transportation in industry.

(g) List the different types of mixing equipments.

22313 [2 of 3]

2. Attempt any THREE of the following : 12

(a) Explain the construction and working of smooth roll crusher.

(b) Explain the construction and working of magnetic drum separator.

(c) Draw a neat sketch of Basket Centrifuge and write its construction.

(d) Explain the working of wet scrubber.


(a) Draw a neat labelled diagram of Blake Jaw Crusher.

(b) Derive the equation for effectiveness of screen.

(c) Explain the working of electrostatic precipitator.

(d) What rotational speed in rpm would you recommend for a ball mill

that is 1000 mm in diameter charged with 70 mm balls ?


(a) Derive an expression for the critical speed of ball mill.

(b) Differentiate between differential and cumulative screening

operations.

(c) Explain 1-2-3-2-1-2-3-2...... filtration system.

(d) With the help of a neat diagram, explain the construction of rotary

vacuum drum filter.

(e) Explain the working of cyclone separator with neat sketch.

5. Attempt any TWO of the following : 12

(a) With neat sketch explain the construction and working of fabric

filter.

22313 [3 of 3]

P.T.O.

(b) Explain the construction and working of sigma mixer with neat

sketch.

(c) With neat sketch explain the construction and working of belt

conveyor.


(a) Write any two industrial applications of

(i) Cyclone separator

(ii) Electrostatic separator

(iii) Wet scrubber

(b) Describe the laboratory scale Batch Sedimentation test.

(c) Describe the principle, construction and working of pneumatic

conveyor.

_______________









Marks


a) Give the names of any four size reduction equipments.

b) Define size reduction.

c) List the name of different screening equipments.

d) Give the working principle of Basket Centrifuge.

e) List the names of different equipments used for gas-solid separation.

f) Give any two applications of conveyers in industry.

g) Names the different types of agitators used in mixing.

P.T.O.

22313 [ 2 ]Marks


a) Draw neat and labeled diagram of ball mill and give its working principles.

b) Explain the construction and working of vibrating screen.

c) Draw a neat diagram of rotary drum filter and explain its working.

d) Describe the working of cyclone separator with a neat sketch.


a) State kicks law in size reduction with mathematical equation.

b) Explain in brief Hammer mill with a neat sketch.

c) Describe the working of froth flotation cell and give its any two industrial application.

d) Explain the construction and working of a belt conveyor.


a) Calculate the operating speed of ball mill if operating speed is 55% of critical speed. Data:

(i) Diameter of Ball mill = 800 mm.

(ii) Diameter of Ball = 60 mm.

b) Draw the diagram of magnetic drum separator and give any two industrial applications.

c) Explain the construction and working of gravity settling tank used in sedimentation.

d) Describe methods to prevent vortexing

e) Explain the working of basket centrifuge with a neat sketch.

22313 [ 3 ]Marks


a) Explain the construction and working of electrostatic precipitator with a neat sketch.

b) With neat sketch, explain construction of muller mixer.

c) Give the principle of bucket elevator and explain its working with a neat sketch.


a) Explain any two types of agitators with suitable diagrams.

b) Describe plate and frame filter press.

c) Explain the chain conveyor with a neat sketch.

22314

[1 of 2] P.T.O.


Instructions : (1) All Questions are compulsory. (2) Illustrate your answers with neat sketches wherever

necessary. (3) Figures to the right indicate full marks. (4) Assume suitable data, if necessary. (5) Use of Non-programmable Electronic Pocket Calculator is

permissible.

Marks 1. Attempt any FIVE of the following : 10 (a) Write the principle in the manufacturing of oxygen and nitrogen. (b) Write the significance of calcinations for cement process. (c) Write any two properties and any two applications of caustic soda. (d) Define red and yellow phosphorus. (e) List the industrial applications of ammonium nitrate. (f) Write the reaction involved in manufacturing of sulphuric acid. (g) Give any two properties of area and also raw materials used for

urea.

2. Attempt any THREE of the following : 12 (a) Explain the manufacturing process of nitric acid. (b) Draw the process flow diagram for manufacturing of ammonium

nitrate. (c) Distinguish between single and triple superphosphate with respect

to raw material and uses. (d) Draw process flow diagram of manufacturing of soda ash.

22314 [2 of 2]

3. Attempt any THREE of the following : 12 (a) Classify the cement on the basis of constituents. (b) Draw a flow sheet diagram of manufacturing of producer gas and

explain its working. (c) Draw a process flow diagram for manufacturing of sulphuric acid. (d) Write the industrial applications of (i) Urea (ii) Ammonia.

4. Attempt any THREE of the following : 12 (a) Explain how yellow phosphorous is converted into red phosphorus. (b) Describe the manufacturing process of potassium fertilizer. (c) Describe the various types of refractivity. (d) Explain manufacturing of water gas with the help of process flow

diagram. (e) Describe the importance of mixed fertilizer in agriculture sector.

5. Attempt any TWO of the following : 12 (a) Explain the manufacturing process of phosphoric acid with

chemical reaction and process flow diagram. (b) Give the raw materials, chemical reaction and industrial

application for manufacturing of ammonium sulphate. (c) Explain the manufacturing of Di-ammonium phosphate with a

process flow diagram.

6. Attempt any TWO of the following : 12 (a) Describe the manufacturing process of caustic soda with process

flow diagram. (b) Explain the concept of absorption for the manufacturing of carbon

dioxide. (c) Write down the industrial application of following : (i) Hydrochloric acid (ii) Sulphuric acid (iii) Nitric acid

_______________

22314

[1 of 2] P.T.O.








(7) Mobile Phone, Pager and any other Electronic Communication

devices are not permissible in Examination Hall.

Marks


(a) List the industrial application of ‘water gas’ and ‘producer gas’.

(b) Define ‘Refractory’. Give it’s type.

(c) Enlist raw material for the manufacturing of Soda Ash.

(d) Define red and yellow phosphorous.

(e) State industrial use of Ammonium Sulphate.

(f) Enlist the reactions involved in manufacturing of Nitric Acid.

(g) Enlist the raw material required in manufacturing of Ammonium Nitrate.


(a) Draw the process flow diagram for manufacturing of Hydrochloric acid (HCl)

(b) Explain the manufacturing process of ‘urea’.

(c) Explain the manufacturing process of Di-Ammonium Phosphate.

(d) Discuss about Economics and manufacturing industries of potassium

fertilizer.

22314 [2 of 2]


(a) Explain the function of constituents of cement.

(b) Explain preparation of Hydrogen from water gas.

(c) Draw the process flow diagram for manufacturing of sulphuric acid.

(d) State the raw materials for manufacturing of ammonia. Write the balanced

chemical reaction also.


(a) Explain the manufacturing of Triple super phosphate with flow diagram.

(b) Describe manufacturing process of ‘Chlorine’.

(c) Summarize the properties of good ‘refractoriness’.

(d) Explain the manufacturing of ‘carbon dioxide’.

(e) State the industrial applications of mixed fertilizers.


(a) Describe manufacturing of phosphoric acid with raw material. Reactions and

flow diagram.

(b) Describe the manufacturing of Ammonium Nitrate.

(c) Identify and manufacture the phosphorous required for match box sticks.


(a) Enlist industrial application of Soda Ash.

(b) Describe the manufacturing of producer gas by using coal.

(c) Apply the principle of DCDA in manufacturing of sulfuric acid with flow

diagram.

_______________

P.T.O.

Instructions : (1) All questions are compulsory. (2) Answer each next main question on a new page. (3) Illustrate your answers with neat sketches wherever necessary. (4) Figures to the right indicate full marks. (5) Assume suitable data, if necessary. (6) Use of Non-programmable Electronic Pocket Calculator is

permissible. (7) Mobile Phone, Pager and any other Electronic Communication

devices are not permissible in Examination Hall.

Marks

1. Attempt any five of the following : (2×5=10)

a) Write any three units of temperature.

b) Write Van der Waal’s equation and give meaning of terms involved in it.

c) Definesteadystateandunsteadystateoperation.

d) Writethestoichiometriccoefficientforthegivenreaction:

4FeS2 + 11 O2→2Fe2O3 + 8SO2 e) DefineNCVandGCV.

f) List out the different forms of energy.

g) Convert3atmintokPaandmmHg.

2. Attempt any three of the following : (4×3=12)

a) WritetheSIunitofenergy,power,heatandwork.

b) Agascontainedinaclosedvesselatapressureof121.59kPagand299Kisheatedtoatemperatureof1000°C.Findthepressuretowhichaclosedvesselshouldbedesigned.

c) Thegroundnutseedscontaining45%oiland45%solidsarefedtoanexpeller,thecakecoming out of expeller is found to contain 80% solids and 5% oil. Find the % recovery of oil.

d) Ethyleneoxideisproducedbyoxidationofethylene.100kmolofethylenearefedtoreactorandtheproductisfoundtocontain80kmolethyleneoxideand10kmolCO2. Calculate:

a) % conversion of ethylene b) % yield of ethylene oxide.

223153 Hours / 70 Marks SeatNo.

*22315*

11819

22315 [2] *22315*Marks


a) Asampleofdryfluegashasthefollowingcompositionbyvolume⇒ CO2 = 13.4%, N2 = 80.5%; O2 = 6.1%. Find the % excess air supplied assuming that the fuel contained nonitrogentheN2 and O2inthefluegasmusthavecomefromair.

b) AstreamofCO2flowingatarateof100kmol/min.isheatedfrom298Kto383K.CalculatetheheatthatmustbetransferredusingCp°.

Data:Cp°=a+bT+cT2 + dT3KJ/(kmol.K)

Gas a b × 103 c × 106 d × 109

CO2 21.3655 64.2841 – 41.0506 9.7999

c) Describe recycle and bypass operation with neat diagram.

d) Calculatethedensityofaircontaining21%O279%N2byvolumeat503Kand 1519.875kPa.


a) Calculatethestandardheatofreactionat298Kofthefollowingreaction:

Na2CO3(s)+Fe2 O3(s)→Na2O. Fe2O3(s)+CO2(g)

Component ∆H°C,kJ/molat298k

Na2CO3 – 1130.68

Fe2O3 – 817.3

Na2O - Fe2O3 – 1412.2

CO2 – 393.51

b) Aproducergaswiththecompositionbyvolume27%CO,6%CO2, 1% O2and66%N2 is burntwith20%excessair.Ifthecombustionis98%complete.Calculatethecompositionbyvolumeofthefluegases.

c) Describe the gas absorption operationwith block diagram andmaterial balanceequation.

d) A feed containing 60 mole % A, 30 mole % B and 10 mole % inerts enters a reactor. Theproductstreamleavingthereactorisfoundtocontain2mole%A.Reactiontakingplaceis2A+B→C.Findthe%oforiginalAgettingconvertedtoC.

e) Calculatetheheatrequiredtoraisethetemperatureof100kgwaterat40°Cto90°C

Cp=4.187 KJkgK

.

Marks*22315* [3] 22315

5. Attempt any two of the following : (6×2=12)

a) Calculatethevapourpressureofpurebutaneat20°Cifitspartialpressureis698mmHgina butane-acetone mixture. The mole fraction of acetone in the mixture is 0.577.

b) Awasteacidfromanitratingprocesscontains23%HNO3,57%H2SO4 and 20% water byweight.Thisacidistobeconcentratedtocontain27%HNO3,60%H2SO4 by the additionofconcentratedH2SO4containing93%H2SO4andconc.HNO3 containing 90% HNO3. Calculatetheamountsinkgofwasteandconc.acidsthatmustbecombinedtoobtain1000kgofdesiredmixture.

c) GaseousbenzenereactswithhydrogeninthepresenceofNicatalystasperthereaction:

C6H6(g)+3H2(g)→C6H12(g)

30%excessH2 is used above that required by the above reaction. Conversion is 50% andyieldis90%.Calculatetherequirementofbenzeneandhydrogengasfor100molesof cyclohexane.

6. Attempt any two of the following : (6×2=12)

a) Anevaporatorisfedwith15000kg/hofasolutioncontaining10%NaCl,15%NaOHandrestwater.Intheoperation,waterisevaporatedandNaCl is precipitated as crystals. Thethickliquorleavingtheevaporatorcontains45%NaOH,2%NaCl and rest water. Calculate:

a) kg/hwaterevaporated b) kg/hsaltprecipitated c) kg/hthickliquor.

b) Afeedtoacontinuousfractionatingcolumnanalysesbyweight28%benzeneand72%toluene.Theanalysisofthedistillateshows52weight%benzeneand5weight%benzenewasfoundinthebottomproduct.Calculatetheamountofdistillateandbottomproductper1000kgoffeedperhour.Alsocalculatethe%recoveryofbenzene.

c) In the production of SO3,100kmolofSO2and100kmolofO2 are fed to a reactor. If the % conversion of SO2is80.Calculatethecompositionoftheproductstreamonmolebasis.

––––––––––––––

22315

[1 of 4] P.T.O.






Marks


(a) Define sensible heat and latent heat.

(b) State Dalton’s law and Amagat’s law.

(c) Define heat capacity and give its SI unit.

(d) If evaporator operates under vacuum at 475 torr. Find the absolute pressure.

(e) Write the stoichiometric coefficient’s for the given reaction :

4HCl + O2 2Cl2 + 2H2O

(f) Define Net Calorific Value (NCV) and Gross Calorific Value (GCV).

(g) Draw a block diagram indicating material balance for distillation process.


(a) Convert a volumetric flow rate of 1000 m3/h to l/s.

(b) The ground nut seeds containing 45% oil and 45% solids are fed to an

expeller, the cake coming out of expeller is found to contain 80% solids and

5% oil, Find the percentage recovery of oil.

22315 [2 of 4]

(c) A feed containing A, B and inerts enters a reactor. The reaction taking place is

2 A + B C

The product stream leaving the reactor is having the following composition by

mole :

A = 23.08%, B = 11.54%, C = 46.15% and inerts = 19.23%. Find the analysis

of feed on mole basis.

(d) State and explain the Hess’s law of constant heat summation.


(a) A sample of coal is found to contain 63% carbon and 24% ash on a weight

basis. The analysis of refuse after combustion shows 7% carbon and rest ash.

Calculate the % of the original carbon unburnt in the refuse.

(b) A dryer handle 1000 kg/hr of wet solids containing 50% solid to be dried to

20% moisture. Calculate percentage of original moisture removed.

(c) Ethylene oxide is produced by oxidation of ethylene. 100 kmol of ethylene are

fed to a reactor and the product is found to contain 80 kmol ethylene oxide

and 10 kmol CO2. Calculate (i) the % conversion of ethylene and (ii) the %

yield of ethylene oxide.

(d) Calculate the heat needed to raise the temperature of 1 kmol of ammonia from

311 K to 422 K using the following mean molal heat capacity data :

Cpm of NH3 between 311 & 298 K = 35.86 kJ/(mol.K)

Cpm of NH3 between 422 & 298 K = 37.70 kJ/(mol.K)


(a) A mixture of CH4 & C2H6 has the average molecular weight of 22.4. Find

mole % CH4 and C2H6 in the mixture.

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P.T.O.

(b) It is desired to have a mixed acid containing 40% HNO3, 43% H2SO4 and

17% H2O by weight. Sulphuric acid of 98% by weight is readily available.

Calculate

(i) the strength of nitric acid and

(ii) the weight ratio of sulphuric acid to nitric acid.

(c) A combustion reactor is fed with 50 kmol/h of butane and 2100 kmol/h of air.

Calculate the % excess air used.

(d) A sample of dry flue gas has the following composition by volume :

CO2 = 13.4%, N2 = 80.5%, O2 = 6.1%

Find the % excess air supplied assuming that the fuel contained no nitrogen,

the nitrogen and oxygen in flue gas must have come from air.

(e) A force equal to 19.65 kgf is applied on a piston with a diameter of 5 cm.

Calculate the pressure exerted on the piston in kPa.


(a) In the manufacture of nitric acid initially ammonia and air are mixed at

810.325 kPa and 923 K the composition of the mixture (on vol. basis) is as

follows : N2 = 70.5%, O2 = 18.8%, H2O = 1.2%, NH3 = 9.5%

Calculate the density of the gas mixture using ideal gas law.

(b) The average molecular weight of a flue gas sample is calculated by two

different engineers. One engineer uses the correct molecular weight of 28 for

N2 and determines the average molecular weight to be 30.08, the other

engineer uses an incorrect value of 14, and calculates the average molecular

weight to be 18.74. Calculate

(i) the volume % of N2 in the flue gases.

(ii) if the remaining components of the flue gases are CO2 and O2.

Find the volume % of each of them.

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(c) A gas mixture containing 15 mole % A and 85 mole % inerts is fed to an

absorption tower where it is contacted with liquid solvent ‘B’ which absorbs

‘A’. The mole ratio of solvent to gas entering tower is 2 : 1. The gas leaving

the absorber contains 2.5% A, 1.5% B and rest inerts (on mole basis). Find

(i) the % recovery of solute ‘A’ and

(ii) the fraction of solvent (B) fed to the column lost in gas leaving the

tower.


(a) In a oxidation process during production of chlorine gas by oxidation of

hydrochloric acid gas. Air is used 30% in excess of that theoretically required,

based on 4 kmol HCl, if oxidation is 80% complete. Find the composition of

product stream on mole basis.

(b) A feed containing 60 mole % A, 30 mole % B and 10 mole % inerts a reactor.

The product stream leaving the reactor is found to contain 2 mole % A.

Reaction taking place is 2A + B C.

Find the percentage of original ‘A’ getting converted to C.

(c) Calculate the heat of formation of phenol crystals at 298.15 k from its

elements using the following data :

Standard heat of formation of CO2 = – 393.51 kJ/mole.

Standard heat of formation of H2O = – 285.83 kJ/mole.

Heat of combustion of phenol at 298.15 k = –3053.25 kJ/mole.

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22311 · 2019. 8. 23. · 22311 11819 3 hours / 70 marks seat no. p.t.o. instructions – (1) all...

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