GTU 3130508 Material & Energy Balance Computation Summer 2025 Question Paper & PDF

In a double effect evaporator, the second effect is maintained under vacuum of 475 torr (mm Hg). Find the absolute pressure in kPa, bar and psi.

The flow rate of water through a pipe is reported as 20 ft³/ min. Convert the volumetric flow rate into the mass flow rate in kg/sec. Density of water is 1 gm/cc.

In the case of fluids, the local heat-transfer coefficient for long tubes and using temperature properties is expressed by the empirical equation h = 0.023 G0.8 × k 0.67 × Cp 0.33 / (D0.2 × μ0.47 ) Where, h = heat transfer coefficient, Btu/(h·ft² ·℉) G = mass velocity of fluid, lb/(ft²· s) Cp = heat capacity of fluid at constant pressure, Btu/(lb℉) k = thermal conductivity, Btu/(h· ft · ℉) D = diameter of tube, ft μ = viscosity of liquid, lb/(ft · s) convert the empirical equation into SI unit.

A sample of milliolite limestone, obtained from Porbandar, Gujarat, is found to contain 54.5% CaO (by mass). If this CaO is present as CaCO3 in the limestone, find the content of CaCO3 in the limestone.

Ethanol is present in the aqueous solution to the extent of 1200 mg/l. Find TOC and ThOD of the solution in mg/l.

An aqueous solution of acetic acid of 35% concentration (by mass) has density 1.04kg/lit at 298.15. Find the molarity, normality and molality of the solution

A solution of ethyl alcohol containing 8.6% alcohol is fed at the rate of 1000 kg/hr to a continuous distillation column. The product (distillate) is a solution containing 95.5% alcohol. The waste solution from the column carries 0.1% of alcohol. All percentages are by mass. Calculate (a) the mass flow rates of top and bottom products in kg/h and (b) the percentage loss of alcohol.

Define following with suitable examples PFD and P&ID diagram (2) Conversion and Yield

A liquid fuel is found to contain 83% C, 15% H2 and 2% Sulphur. Calculate the net calorific value (NCV) of liquid sample at 298 K. Data: Gross calorific value of fuel at 298 K is 45071 kJ/kg of liq fuel. Latent heat of water vapor at 298K =2442.5 kJ/kg.

The analysis of limestone gives 60% CaCO3, 33.5% MgCO3 and rest inerts. It is treated with 12% aqueous sulphuric acid by mass to obtain pure CO2. An excess of 15% of the acid over the stoichiometric amounts is used to ascertain that the reaction goes to completion. Based on the treatment of 500 kg limestone, calculate: (a) the amount of 100% (by mass) sulphuric acid required, (b) the amount of the residue, (c) the analysis of the residue left in the vessel, and (d) the moles of CO2 produced.

A gas mixture has the following composition on mole basis. CH4:84%, C2H6:13% and N2:3%. Calculate the energy to be added to heat the 15 kmol of gas mixture from 298 K to 523 K using heat capacity data given below. CP0 = a +bT + cT² +dT³ where Cp0 is in kJ/kmol K or J/mol K. Component a b x 10³ c x 10⁶ d x 10⁹ CH4(g) 19.25 52.11 11.97 -11.32 C2H6(g) 5.41 178.19 -67.38 8.72 N2(g) 29.59 -5.41 13.18 -4.97

Calculate the heat of reaction of the following reaction. 4NH3(g) +5O2(g) 4NO(g) +6H2O(g) Data: Component ∆HfOcal/ gmol NH3(g) -11020 NO(g) 21570 H2O(g) -57796