what are your personal standards and how do you achive them?

2 Answers   IBM, IIT,

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For a centrifugal pump if the pump is running and we close the discharge valve what is the effect

11 Answers   Asian Paints, NFTDC, Reliance,

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Calculate the line size for a cooling water line with a volumetric flowrate of 1200m3/h of water. Density of water = 1000kg/m3

1 Answers  

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What are some guidelines for designing for liquid and gas velocities in process plant piping?

0 Answers  

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How can viscosity affect the design of a mixer?

0 Answers  

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Why Packed Bed is not preffered in seperation process while Tray column is used in Industries predominatly??

5 Answers  

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why is cross over inlet provided in a furnace?

3 Answers   Essar,

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What are the main terms in unit operations? What are its characteristics?

0 Answers  

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Are some heat transfer services more prone to tube vibration that others for a shell and tube exchanger?

0 Answers  

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Explain what are some typical applications for glass-lined reactors?

0 Answers  

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Explain can large temperature differences in vaporizers cause operational problems?

0 Answers  

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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.

1 Answers  

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