An industrial waste-water stream is fed to a stirred-tank reactor continuously and the cells are recycled back to the reactor from the bottom of the sedimentation tank placed after the reactor. The following are given for the system: F = 100 l/h; S0 = 5000 mg/l; mm = 0.25 h-1 ; Ks = 200 mg/l; α (recycle ratio) = 0.6; C (cell concentration factor) = 2; Y ^M _X/S = 0.4. The effluent concentration is desired to be 100 mg/l.  Determine the required reactor volume.

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#Question id: 14485

#Section 1: Engineering Mathematics

In a race where 12 horses are running, the chance that horse A will win is 1/6, that B will win is 1/10 and that C will win is 1/8. Assuming that a dead heat is impossible the chance that one of them will win

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#Question id: 14486

#Section 1: Engineering Mathematics

There are two bags, one of which contains 5 red and 7 white balls and the other 3 red and 12 white balls. A ball is to be drawn from one or other of the two bags, find the chance of drawing a red ball.

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#Question id: 14487

#Section 1: Engineering Mathematics

What is the probability of a particular person getting 9 cards of the same suit in one hand at a game of bridge where 13 cards are dealt to a person ?

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#Question id: 14488

#Section 1: Engineering Mathematics

A man and his wife appear for an interview for two posts. The probability of the husband's selection is 1/7 and that of the wife’s selection is 1/5. The probability that only one of them will be selected is

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#Question id: 14489

#Section 1: Engineering Mathematics

There are two bags. One bag contains 4 white and 2 black balls. Second bag contains 5 white and 4 black balls. Two balls are transferred from first bag to second bag. Then one ball is taken from the second bag. The probability that it is white is

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#Question id: 14490

#Section 1: Engineering Mathematics

In a single throw of two dice find the probability that neither a doublet (same number on the both dice) nor a total of 9 will appear.