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‣
Biochemical Engineering
‣
Sterilization
Comments
Question
The specific death rate of an organism can be expressed as
Options
A. ln 2/
D
B.
D
/ln2
C.
D
.ln2
D. 2.0.3/ln2
Correct Answer
ln 2/
D
Sterilization problems
Search Results
1. The relationship between the del factor, temperature and time is given as
Options
A. ? = A.t. e
-E/RT
B. ? = 1/(A.t. e
-E/RT
)
C. ? = A.t. e
E/RT
D. ? = A.t.T
Show Answer
Scratch Pad
Discuss
Correct Answer: ? = A.t. e
-E/RT
2. Which of the following impellers are used for wide range of viscosities?
Options
A. paddles
B. turbines
C. propellers
D. none of these
Show Answer
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Discuss
Correct Answer: turbines
3. The volume of liquid
(V
L
)
in a cylindrical reactor can be calculated from the liquid height
(H
L
)
and tank diameter
(D
t
)
using the following equation
Options
A.
V
L
= 4/3 x ? x
H
L
x
D
t
3
/8
B.
V
L
=
H
L
x ? x
D
t
2
/4
C.
V
L
=
H
L
x ? x
D
t
2
D.
V
L
= 4 x ? x
D
t
2
Show Answer
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Discuss
Correct Answer:
V
L
=
H
L
x ? x
D
t
2
/4
4. What is the ratio of diameter of impeller to the diameter of tank (
D
a
:D
t
)?
Options
A. 1 : 3
B. 2 : 1
C. 4 : 1
D. 1 : 5
Show Answer
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Discuss
Correct Answer: 1 : 3
5. Radial flow impellers
Options
A. provide high shear conditions for breaking up bubbles
B. direct flow towards the walls of the reactor
C. Both (a) and (b)
D. provide low shear conditions and are suited for use in shear sensitive procesess
Show Answer
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Discuss
Correct Answer: Both (a) and (b)
6. The radius of the filter with a depth of 14 cm required for a volumetric airflow rate of 10 m
3
/min is approximately
Options
A. 1.6 m
B. 0.6 m
C. 3
D. 6 m
Show Answer
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Discuss
Correct Answer: 0.6 m
7. The collection efficiency by interception increases with the
Options
A. increasing particle diameter
B. increasing air flow velocity
C. both (a) and (b)
D. increasing particle size
Show Answer
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Discuss
Correct Answer: increasing particle size
8. The heated medium passes through a holding section, which is usually maintained in
Options
A. adiabatic conditions
B. isothermal conditions
C. isotropic conditions
D. isobaric conditions
Show Answer
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Discuss
Correct Answer: adiabatic conditions
9. The collection efficiency by the inertial impaction mechanism is the function of
Options
A. Stokes and Reynolds number
B. Stokes and Schmidt number
C. Grashoff and Reynolds number
D. Stokes and Grashof number
Show Answer
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Discuss
Correct Answer: Stokes and Reynolds number
10. The moist heat is more effective than the dry heat because the intrinsic heat resistance of vegetative cells is greatly
Options
A. increased in a dry state
B. decreased in a dry state
C. increased in a wet state
D. decreased in a wet state
Show Answer
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Discuss
Correct Answer: increased in a dry state
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Immobilized Enzyme
Sterilization
Water Treatment