Question is ⇒ The mechanical means of accomplishing sterilization of fermentation media/equipment is, Options are ⇒ (A) ultrasonic, (B) radiation, (C) chemical agents, (D) none of these, (E) , Leave your comments or Download question paper.

Question is ⇒ The mechanical means of accomplishing sterilization of fermentation media/equipment is, Options are ⇒ (A) ultrasonic, (B) radiation, (C) chemical agents, (D) none of these, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The mechanical means of accomplishing sterilization of fermentation media/equipment is
A.	ultrasonic [Correct Answer]
B.	radiation [Wrong Answer]
C.	chemical agents [Wrong Answer]
D.	none of these [Wrong Answer]
View Answer 2 -4 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ The mechanism of air filtration in fibrous filter is
electrostatic attraction
impaction
interception
all of these

⇒ The destruction of microorganisms by steam may be described as
first order chemical reaction
zero order chemical reaction
second order chemical reaction
none of these

⇒ The X₉₀ value for a filtration system is
the time required to reduce microbial population by 90%
the time required to traverse survivor curve by one log cycle.
the depth required to reduce population by 90%
the depth of the filter required to reduce population by 99%

⇒ Sterilization can be carried out by
heat
radiation
chemical agents
all of these

⇒ The value of K
increases with increase in air velocity
decreases with increase in air velocity
increases to an optimum with increase in air velocity and decreases on further increase of air velocity
none of these

⇒ The highest temperature which appears to be feasible for batch sterilization is
121°C
100°C
105°C
130°C

⇒ For the turbulent flow, the dispersion coefficient is correlated as a function of
Reynolds number
Sherwood number
Schmidt number
Grashof number

⇒ Typical aeration rates for aerobic fermentation are
0 - 0.5 vvm
0.5 - 1.0 vvm
1.0 - 1.5 vvm
1.5 - 2.0 vvm

⇒ The filter material used for air filtration system is/are
glass wool
glass fibre
norite
all of the above

⇒ The specific death rate of an organism can be expressed as
ln 2/D
D/ln2
D.ln2
2.0.3/ln2

⇒ The radius of the filter with a depth of 14 cm required for a volumetric airflow rate of 10 m³/min is approximately
1.6 m
0.6 m
3
6 m

⇒ The collection efficiency by the inertial impaction mechanism is the function of
Stokes and Reynolds number
Stokes and Schmidt number
Grashoff and Reynolds number
Stokes and Grashof number

⇒ The collection efficiency by interception increases with the
increasing particle diameter
increasing air flow velocity
both (a) and (b)
increasing particle size

⇒ The heat conduction in dry air is
less rapid than in steam
more rapid than in steam
similar to steam
none of these

⇒ For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is
0.5
0.75
0.87
0.37

⇒ The interception efficiency can be expressed as (where d_p is the particle diameter and D_c cylindrical collection diameter)
d_p/D_c
d_p x D_c
d_p/D_c x 100
d_pD_c/100

⇒ In sterilization process, spore of which of the following organism is considered as control?
Bacillus subtilis
Clostridium botulinum
Bacillus stearothermophilus
Aspergillus niger

⇒ The typical size of particles collected by diffusion mechanism is
<0.25μm
<0.5μm
<0.75μm
<1μm

⇒ Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where N_St is the Stokes number)
η_imp = 0.075N_St^1.2
η_imp= 0.75N_St^1.2
η_imp = 0.25N_St^1.2
η_imp = 0.025N_St^1.2

⇒ The K used in the equation for X₁₀=2.303/K depends upon
nature of the filter material
linear velocity of the air passing through filter
both (a) and (b)
thickness of the filter

⇒ The reduction of number of cells from 10¹⁰ to one will result into the del factor (Δ) of
1
10
23
10³

⇒ The deviation from ideal plug flow due to axial mixing can be described by the
dispersion model
Langmuir model
Friedlander model
Pasceri model

⇒ If the packing density (α) is defined as the volume of the fiber unit volume of filter bed, the velocity within the filter void space is equal to (where V is velocity in fluid void space and V₀ is undisturbed fluid velocity)
V = V₀/(1-α)
V-V₀ = 1 - α
V = V₀(1 - α)
V = V₀/(1 + α)

⇒ The collection efficiency by diffusion increases with
decreasing particle size
decreasing air velocity
both (a) and (b)
increasing particle size

⇒ The relationship between the del factor, temperature and time is given as
Δ = A.t. e^-E/RT
Δ = 1/(A.t. e^-E/RT)
Δ = A.t. e^E/RT
Δ = A.t.T

⇒ The efficiency of fibrous filter by combined mechanism is given by(where η_imp,η_int,η_dif are the efficiencies by impaction, interception and diffusion respectively)
1 - η_impη_intη_dif
1 - (1 - η_imp)(1 - η_int)( 1 - η_dif)
1 - ( η_impη_int/η_dif)
None of the above

⇒ For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its
larger heat transfer area
smaller heat transfer area
lesser cost
more number of plates

⇒ Glass fibers are favorable as a filter medium because they give a
lower pressure drop and are less liable to wetting or combustion
more pressure drop and are less liable to wetting or combustion
lower pressure drop and are more liable to wetting or combustion
more pressure drop and are more liable to wetting or combustion

⇒ The moist heat is more effective than the dry heat because the intrinsic heat resistance of vegetative cells is greatly
increased in a dry state
decreased in a dry state
increased in a wet state
decreased in a wet state

⇒ The heated medium passes through a holding section, which is usually maintained in
adiabatic conditions
isothermal conditions
isotropic conditions
isobaric conditions