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# Jaypee Institute of Information Technology (JIIT) 2008 B.E Test 3 : Process Engineering - Question Paper

Tuesday, 02 April 2013 12:10Web

JAYPEE UNIVERSITY OF INFORMATION TECHNOLOGY WAKNAGHAT TEST 3

V SEMESTER 2008

Course Name: Process Engineering    Time: I hr 30 min

Course Code. 07B31BT108_Max. Marks: 30

AU Questions are compulsory'

QI. a) What limits the height of the bubble column bioreactor?

b)    Which one is preferred design - downcomer inside draft tube or downcomer outside draft tube?

c)    What arc the operating considerations for batch and continuous bioreactors?

1+1+3)

Q2. Recycic biorcacior can be operated at dilution rates higher than specific growth rate. Support your answer showing derivation.    (5)

Q3. Prove that PER is a batch reactor working in continuous mode. <5)

Q4. Prove that at the steady state for CSTR.

X- DY (So*S>'(KY>n)

Vk here - n XY - - n XT - KX Y: Y** aid Y* apparent yield.    (5)

Q5. Inachemostat with cell recycle the feed flow rate & culture volumes arc F=l00ml/h and Y=1000ml respectively. The system is operated under the glucose limitation & the maximum yield is 0 5 gdw cells per gm substrate. Glucose concentration in the feed is 10 gm/l, umax * 0.2 h'1 and Ks=l g/1, C=1.5, a=0.7. The system is at steady state.

a)    Find the substrate conc. in recycle stream

b)Find    pnet of the organism

c)    Fmd the cell conc. in the recycle stream    (5 = 2+1+2)

06, A strain of mold was grown in a batch culture.

 h) 10 9 16 30 . 34 36 1 40 X(6'l) 1 1.25 2.45 5.1 22 i 33 ,37.5 1 41 S Cel> 1 100 97 90.4 48.1 120.6 I 9.38 1 0.63

a)    Calculate the maximum net sp. growth rate

b)    Calculate the apparent growth yield

c)    What maximum ccll conc. could one expect if 150 gm of glucose were used with the same size inoculum?    (5)

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