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Biochemical Engineering
‣
Sterilization
Comments
Question
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
Correct Answer
adiabatic conditions
Sterilization problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: increasing particle size
2. 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
Scratch Pad
Discuss
Correct Answer: 0.6 m
3. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: ln 2/
D
4. 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
5. 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
Scratch Pad
Discuss
Correct Answer: turbines
6. 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
Scratch Pad
Discuss
Correct Answer: Stokes and Reynolds number
7. 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
Scratch Pad
Discuss
Correct Answer: increased in a dry state
8. The value of K
Options
A. increases with increase in air velocity
B. decreases with increase in air velocity
C. increases to an optimum with increase in air velocity and decreases on further increase of air velocity
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: increases to an optimum with increase in air velocity and decreases on further increase of air velocity
9. The collection efficiency by impaction increases with
Options
A. increasing particle diameter
B. increasing air flow velocity
C. both (a) and (b)
D. increasing particle size
Show Answer
Scratch Pad
Discuss
Correct Answer: both (a) and (b)
10. The efficiency of fibrous filter by combined mechanism is given by(where ?
imp
,?
int
,?
dif
are the efficiencies by impaction, interception and diffusion respectively)
Options
A. 1 - ?
imp
?
int
?
dif
B. 1 - (1 - ?
imp
)(1 - ?
int
)( 1 - ?
dif
)
C. 1 - ( ?
imp
?
int
/?
dif
)
D. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 1 - ?
imp
?
int
?
dif
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