GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019
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Subject Code: 2130504 Date: 07/06/2019Subject Name: Process Calculation
Time: 02:30 PM TO 05:30 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- Atomic weights: C:12, O:16, S:32, Cl:35.5, Na:23, N:14, Mg:24, B:11, Si:28, Al:27, Fe:56, Zn:65, P:31
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Q.1 (a) The volumetric flow rate of kerosene in 80 mm nominal diameter pipe is 75 Imperial 03 gallons per minute. Taking the density of kerosene as 0.8 kg/dm³, find the mass flow in kg/s.
(b) The available nitrogen in an urea sample is found to be 45% (by mass). Find the actual 04 urea content in the sample.
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(c) The conductance of a fluid flow system is defined as the volumetric flow rate, referred 07 to a pressure of one torr (133.322 Pa). for an orifice, the conductance C can be computed from
C= 89.2Av(T/M) ft³/hr
Where, A= area of opening (ft²), T=temperature (°R), M= Molar mass Convert the empirical equation into SI unit.
Q.2 (a) Iron metal weighing 500 Ib occupies a volume of 29.25 L. Calculate the density of Iron 03 in kg/dm³.
(b) Define terms:-Normality, Molality, Molarity, Limiting Reactant 04
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(c) A solution of sodium chloride in water contains 20% NaCl (by mass) at 333 K. The 07 density of the solution is 1.127 kg/L. Find the molarity, normality and molality of the solution.
OR
(c) The analysis of a sample of glass yields 7.8% Na2O, 7.0% MgO, 9.7% ZnO, 2.0% 07 Al2O3, 8.5% B2O3 and 65.0% SiO2 (By mass), Convert this composition into mole %.
Q.3 (a) Find the equivalent mass of (a) PO4 radical, and (b) Na3PO4 03
(b) Using Antoine equation calculate the vapor pressure of Aniline at 380 K. 04 Data: A=6.4450 B=1731.50 C=-67.05
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(c) A multiple-effect-evaporator system has a capacity of processing one tone per day of 07 solid caustic soda when it concentrates weak liquor from 4 to 25 %( both on weight basis). When the plant is fed with 5% weak liquor and if it is concentrated to 50% (both on weight basis), find the capacity of the plant in terms of solid caustic soda, assuming water evaporating capacity to be same in both the cases.
OR
Q.3 (a) Define terms: Excess Reactant, Conversion, Yield 03
(b) Explain importance of process flow sheet in Chemical Engineering Industry with a 04 typical example.
Q.4 (a) One engineer uses the correct molar mass of 28 for N2 and determines the average molar 03 mass to be 30.08, the other engineer, using an incorrect value of 14, calculates the average molar mass to be 18.74. (i) Calculate the volume % of nitrogen in the flue gases, (ii) If the remaining components of the flue gases are CO2 and O2, Calculate the volume % each of them.
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(b) Define terms: Heat of formation, Heat of combustion, Heat of reaction. 04
(c) Discuss uses of recycling and bypassing operation. 07
OR
Q.5 (a) In the Deacon process for manufacturing chlorine, hydrochloric acid gas is oxidized 03 with air. The reaction taking place is 4HCl + O2? 2Cl2 + 2H2O If the air is used in excess of 30% of that theoretically required. Calculate the weight of air supplied per kilogram of acid.
(b) Explain the material balance of crystallizer. 04
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(c) For o-xylene, Calculate latent heat of vaporization at 298.15 K using Watson equation. 07 Latent heat of o-xylene at 417.5 K= 36819 kJ/kmol, Critical temperature of o-xylene = 630.30 K.
OR
Q.5 (a) Pure methane is heated from 303 K to 523 K at atmospheric pressure. Calculate the heat 07 added per kmol methane, using given data. a=19.2494, b=52.1135x10?³, c=11.973x10?6, d=-11.3173x10?¹²
(b) Give classification of fuel in brief. 03
(c) Define terms: Dry-Bulb Temperature, Absolute Humidity, Percentage Humidity, Wet 04 Bulb Temperature
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Q.6 (a) Obtain an expression relating the heat of reaction and the temperature of the reaction 07 SO2(g) + 0.5 O2(g) = SO3(g), Using the same expression, Calculate the heat of reaction at 775 K. ?a=-15.748, ?b=52.799x10?³, ?c=-45.438x10?6, ?d= 13.528x10?¹², ?H°r=-98910 kJ/kmol
OR
Q.6 (a) Define GCV and NCV for fuels. Give its importance. Also give the names of the 07 equipments used for measuring CV of solid, liquid and gases.
(b) Discuss Proximate and Ultimate analysis of coal. 07
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