Question 52 - The half-life for first order reaction could be described in the differential equation dC / dt = -kC where k is a constant, C is concentration and t is time. (a) Find the equation of C as a function of t. (b) Find the half life for such reaction or the time required to reduce 50 % of the initial concentration, where k = 0.139 per minute. (c) When the initial concentration Co is 16 mol / cubic metre, how long does the reaction required to achieve the final concentration of 1 mol / cubic metre?

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Under what circumstances are vortex flowmeters the most accurate?

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Explain how can one estimate how the friction factor changes in heat exchanger tubes with a change in temperature?

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What are the applications of screen analysis in the chemical industry?

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Explain some of the consequences of an undersized kettle type reboiler?

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Explain what are the problems that are associated with the expansion joints?

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Explain how can I evaluate the thermal relief requirements for double block-in of 98% sulfuric acid?

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if the length of a pipe doubled what will be the effect on Pressure in line?

7 Answers   ISRO,

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In engineering economy, the future value of first year is FV = PV (1 i). For second year it is FV = PV (1 i) (1 i). For third year it is FV = PV (1 i) (1 i)(1 i) where FV = future value, PV = present value, i = interest rate per period, n = the number of compounding periods. By induction, what is the future value of $1000 for 5 years at the interest rate of 6%?

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Explain global warming from a common man's and an engineer's perspective?

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ACCOUNTING AND FINANCIAL ENGINEERING - EXAMPLE 34.32 : In the calculation of the total cost of production of an engineering material, a linear equation Y = MX + C could be applied. Let T = total cost, F = fixed cost, V = variable cost, Q = quantity produced, W = variable cost per unit produced. Form a linear equation that relates : (a) T, F and V; (b) V, Q and W.

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all subject of chemical engg

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