Quiz 4 - a

Question 1

In a chemostat, the _________ is kept constant by setting the inlet and outlet flow rates equal

Answer 1

liquid volume

Question 2

In steady state condition, where all concentrations within the vessels are ______ of time

Answer 2

independent

Question 3

At steady state to the limiting substrate, the rate of generation is ________.

Answer 3

zero

Question 4

In cultures where product synthesis is only indirectly coupled to energy metabolism, the rate of substrate consumption is a function of three factors namely:

Answer 4

growth rate, rate of product formation, and the rate of substrate uptake for maintenance

Question 5

The rate of biomass production in a CSTR is ______ to the rate at which cells leave the reactor

Answer 5

equal

Question 6

a type of reactor that do not consider temperature or concentration gradient

Answer 6

Continuous Stirred Tank Reactor (CSTR

Question 7

In a PFTR, the fluid velocity is

Answer 7

constant

Question 8

Microbial death is a probabilistic event with _______ kinetics

Answer 8

first-order

Question 9

__________ is the time of exposure to heat during which the original number of viable microbes is reduced by one tenth

Answer 9

Del factor

Question 10

measure of fractional reduction in living organisms count over the initial number present

Answer 10

Del factor

Question 11

rapid transfer of heat to the medium via direct or indirect heating

Answer 11

radiation

Question 12

Dimensionless number that correlates axial dispersion and bulk fluid flow in pipes

Answer 12

Peclet number

Question 13

Refers to the process through which air circulates through, mixed with, or dissolves in liquid or substance

Answer 13

aeration

Question 14

Other term for packed bed reactor

Answer 14

fixed bed reactors

Question 15

Process wherein the catalyst surface adsorbs the reactant molecules and attaches to the active site.

Answer 15

Contact catalysis

Question 16

A dimensionless number that correlates film transport rate characteristics to intraparticle diffusion rate characteristic

Answer 16

Sherwood number

Question 17

Compared with stirred-tank immobilized cell reactors, the shear at the particle surface is much ________ in a fluidized bed

Answer 17

less*/lower

Question 18

The ________ is the only parameter that the fluidized bed reactor designer is free to choose

Answer 18

density*

Question 19

Fluidized bed are inherently ___ reactors

Answer 19

CSTRs*

Question 20

The constant motion of the particles in fluidized bed prevents ______ and _______ allowing air to be delivered directly into the column

Answer 20

channeling; clogging of the bed

Question 21

Reactor where the upward gas velocity and powder catalyst rate of settling are balanced; the gas input is situated at the bottom center of the mixing zone

Answer 21

Fluidized Bed Reactor

Question 22

A type of reactor with three-phase systems with flowing gas and liquid phases as well asa packed bed of heterogenous catalyst

Answer 22

Trickle bed reactors

Question 23

Use to increase the yield of the desired product while decreasing the production of undesirable associated products

Answer 23

catalysts

Question 24

Measure of the fractional reduction in viable organism count products by a certain heat and time hegime

Answer 24

Del factor

Question 25

Highest temperature feasible for batch sterilization

Answer 25

121

Question 26

A sterilization failure is commensurate with Nt being equal to _____ of a viable cell.

Answer 26

1*

Question 27

Typical value of E in nutrient destruction is

Answer 27

250-290 kJ/gmol

Question 28

The most suitable indirect heat exchangers is

Answer 28

STHE

Question 29

Disc turbine is also known as

Answer 29

Tesla turbine

Question 30

Microoganism used as Baker’s yeast

Answer 30

S. cerevisiae

Question 31

Insulin was first extracted in

Answer 31

dog’s pancreas

Question 32

As of today, penicillin is extract in what microorganism

Answer 32

Penicillium fungi/mold