w w w. s t u p i d s i d. c o m

Size: px

Start display at page:

Download "w w w. s t u p i d s i d. c o m"

Diane Bethanie Norris
5 years ago
Views:

'l'olal No. ol Questions-121 [Tol,al No. of Printed Pages-8+4 t37621-174 S.E. (Chem.

1 'l'olal No. ol Questions-121 [Tol,al No. of Printed Pages-8+4 t S.E. (Chem.) (First Semester) EXAMINATION, 20f0 CH EMICAL PROCESS CALCUI"ATION (2008 coilrse) Tirne : Three Hours Maximum Marks : 100 N.B. z- (l) Answers to the.two Sections should be written in separate answer books. rit) TTca ^f l^oorirh*i. tohlac eliula r"la Mallial charts, electronic (ili) pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION I f. (a) Ii the tbllowing equation is dimensionally homogeneous, find the units of heat transfer coefficient fr, in CGS and SI units.oa h.d n n a.u.t. \- - -;;= v.vzal- cp. p )" "" rer. 1L "( I l--;. I \p/ \ ia,/ (b) Calculate the available nitrogen in the following : (l) Commercial ammonium sulphate (96Vo pure) rii) Prrra cnrlium njflsfg. t81 P.T.O.. \

$t L^\ The strength of a phosphoric acid sample is found trj be 354. I p^f)-,hw nacc) Find ^"1 fha rrrtnrl.nncaniretion ol H^PO, ( " "_' ' :'^- -'^_o_ -+ DI mass) in the acid.$

2 t L^\ The strength of a phosphoric acid sample is found trj be 354. I p^f)-,hw nacc) Find ^"1 fha rrrtnrl.nncaniretion ol H^PO, ( " "_' ' :'^- -'^_o_ -+ DI mass) in the acid. t8l (6) Oxygen is mixed with air to prod,uce oxygen rich air containing 60 mole Vo oxygen. In what ratio oxygen and air is to be mixed? Solve it on weight basis as well as volumetric basis. t8l (a) Soyabean seeds are extracted with hexane in batch extractors. The flaked seeds contain l8.6vo otl, 69Vo solids and 124Vo maisbre. At the end of the extraction process, deoiled cake (DOC) is separated frorn the hexane-oil mixbne. 96.6Va of oil is recovered.. If DOC contains moisture, determine the 7o of oil in T\nrl t8l 2

$(b) tr'eed water 1000 kg/hr 3.17o Sall 4. \a) (,) (id (iii) 137621-L7:4 Brine recycle UT osmosis cell that is t10l Brine waste B 5.$

3 (b) tr'eed water 1000 kg/hr 3.17o Sall 4. \a) (,) (id (iii) L7:4 Brine recycle UT osmosis cell that is t10l Brine waste B 5.25o/o salt A spent lye sample obtained from a soap making unit contains 9.6Vo glycerol and l0.3va salt (NaCl)' It is concentrated at the P.T.O.

D. (b) (a) rate of 10,000 kg/j:rr in a double effect evaporator until the final' solution contain 80Vo glycerol and 6alo salt. Assume that about 4.5Vo glycerol is lost by entrainrnent.

4 D. (b) (a) rate of 10,000 kg/j:rr in a double effect evaporator until the final' solution contain 80Vo glycerol and 6alo salt. Assume that about 4.5Vo glycerol is lost by entrainrnent. Al1 percentages are by mass. Find : 0 The evaporation taken place in the system and (ii) The amount of salt crystallized out jn the salt box of the evaporator The average molar mass of a flue gas sample is calculated by. two different engineers. One enfineer use the correct molar mass of 28 for N2 and determines the average molar mass to be The other engineer; using an incorreet value of J.4, calculates the avcrage molar mass to be Calculate the volume o/o of N2 in the flue gases. What will be the composition of gases obtained by burning pure FeS2 with 60Eo excess a\r? The reaction 1S 4FeS Fe2O3 +-8SO2 I8l t8l

5 Or [16] P.T.O.

r A heat exchanger for cooling of hot hydrocarbon liquid uses'10,000. kg/hr ol cooling water, which enters the exchanger at 21"C. The hot oil at the rate of.5000 kg/}r en'ters at 150"C and leaves at.

6 r A heat exchanger for cooling of hot hydrocarbon liquid uses'10,000. kg/hr ol cooling water, which enters the exchanger at 21"C. The hot oil at the rate of.5000 kg/}r en'ters at 150"C and leaves at. 65'C and has an average hea1, capacity of 2.51 kj/kgk. Calculate.the outldt temperature of water. (6) A mixture of isomeric tliphenyl-diphenyloxide is used as a thermic t74 fluid in a liquid heating system. The thermic fluid enters an indirect fired heater at 453 K and leaves at 533 K. The heat capacity of the fluid is given by where (r) ILL) Cp' = 1'436 + ln supply kj/kck heater loj per kg of the K CITOI the [10]

7 + O2(g) --> + 9O2(e) -> at oly arr rs supp[ed the combustibn of

the composition of the wel gas stream leaving the convert' er. Calculate the! heat to be added or removed per kmol of tolue'ne charged' 26.L Lt.7 N 2 29.6 4I4 coz 19.8 73'4 HzO. 32.5 008 t16l ' 9.

8 the composition of the wel gas stream leaving the convert' er. Calculate the! heat to be added or removed per kmol of tolue'ne charged' 26.L Lt.7 N I4 coz '4 HzO t16l ' 9. Oil is.to be extracted from a meal by a continuous counter-current ' o2 extractor. The unit is charged with 1000 kg/hr meal based on oil-free solids. Untreated meal contains 0 4 kg oil and kg benzene per kg of oil-free meal. A fresh solvent is benzene containing 1'

and the t161 10. (a). The dry bulb temperature and dew point of ambient air were found to be 302 K and 291 K regpectively.

9 and the t (a). The dry bulb temperature and dew point of ambient air were found to be 302 K and 291 K regpectively. The barometer reads 100 kpa absolute. Compute : (r) (ii) (iii) absolute humidity Vo RH Vo sattnatiort (iu) humid heat and (u, humid volurne. Or t101 l:3' P.T.O.

10 Mass Vo t0 Mass 7a o O

The gross calorific value = 23392 kjkg at 298.15 K. (b) UalCulate: (i) (ii) (iti) The net hydrogen in the coal The combined water in the coal GCV based oh the Dulong formula and (iu) NCV of the coal.

11 The gross calorific value = kjkg at K. (b) UalCulate: (i) (ii) (iti) The net hydrogen in the coal The combined water in the coal GCV based oh the Dulong formula and (iu) NCV of the coal. A sample of fuel oil has C/H ratio 9.33 (by mass) and contains, sulphir to the extent of 1.37o (mass). The GCV of the fuel is measured to be kj&g at K. Calculate its NCV at K. ' O r 12, (a) A fuel gas constitutes of CO2 : 3.47o, C2H4 : 3.7Vo, C5H6 :!.670,. A2 : O.!ok, CO :!7.4Vo, H2 : 36.8/o, CII4 : 24.9Vo and N2 : 12.07o (on mole basis). It is burnt with air in a firrnace. The pyrite analyzer indicated 10.0 mole 7o CO2 6n dry basis) in the flue (i) The percentage excess air used and Gil The complete Orsat analysis.. 1l t61 t101 P.T.O

12 I.f

S.E. (Chemical) (First Semester) EXAMINATION, 2012 PROCESS CALCULATIONS (2008 PATTERN) Time : Three Hours Maximum Marks : 100

Total No. of Questions 12] [Total No. of Printed Pages 8 Seat No. [4162]-185 S.E. (Chemical) (First Semester) EXAMINATION, 2012 PROCESS CALCULATIONS (2008 PATTERN) Time : Three Hours Maximum Marks : 100