Explain the different ways in which solids can be blended?

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Question 88 - In the calculation of the growth of bacteria, colony forming unit (CFU) in serial dilution is used. In a laboratory, viable count assay is used to estimate CFU. Formula applied is CFU / mL = (number of colonies x dilution) / (amount plated, in unit mL). Acceptable plate count is either between 20 and 200 or between 30 and 300 according to 2 different references. A wastewater sample of 200 ml is added to and mixed with 1.8 L of sterile water. Another 200 ml of the mixture is added to and mixed with 1.8 L of sterile water. (a) Calculate the dilution of first mixture and the dilution of the second mixture. (b) 100 microlitres of wastewater samples from the first mixture and the second mixture are placed separately on 2 different alga plates. The first plate has 250 colonies and the second plate has 23 colonies. Calculate the average CFU / mL.

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Why is post-weld heat treatment (stress relieving) sometimes necessary for welded vessels?

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What are the apt definitions for apparent power, active power and reactive power?

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To how much height the liquid willbe thrown out to atmosphere from a pump with a discharge pressure of 5bar

4 Answers   TCL,

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wha is Adsorption column chromatography?

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What is difference between Overall heat transfer coeficient & individual heat transfer coefficient

4 Answers   CVSR, NFTDC,

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Why is respiration considered as an exothermic reaction? Explain?

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How to calculate the sonic velocity of a gas stream?

1 Answers   Sony,

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Name some common problems associated with dilute phase pneumatic conveying?

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What is the average salary for chemical engineers?

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Question 102 - (a) As an approximation, let v = Zc / 137 where v is the radial velocity for 1 s electron of an element, c is the speed of light, Z is the atomic number. For gold with Z = 79, find the radial velocity of its 1 s electron, in term of c and percentage of the speed of light. (b) As an approximation, let A x A = 1 - Z x Z / 18769 where A is the ratio of the relativistic and non-relativistic Bohr radius. Find the value of A.

1 Answers  

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