Biochemical Engineering

Question: The deviation from ideal plug flow due to axial mixing can be described by the
[A].

dispersion model

[B].

Langmuir model

[C].

Friedlander model

[D].

Pasceri model

Answer: Option A

Explanation:

No answer description available for this question.

Question: For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is
[A].

0.5

[B].

0.75

[C].

0.87

[D].

0.37

Answer: Option A

Explanation:

No answer description available for this question.

Question: The heated medium passes through a holding section, which is usually maintained in
[A].

adiabatic conditions

[B].

isothermal conditions

[C].

isotropic conditions

[D].

isobaric conditions

Answer: Option A

Explanation:

No answer description available for this question.

Question: For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its
[A].

larger heat transfer area

[B].

smaller heat transfer area

[C].

lesser cost

[D].

more number of plates

Answer: Option A

Explanation:

No answer description available for this question.

Question: The reduction of number of cells from 1010 to one will result into the del factor (Δ) of
[A].

1

[B].

10

[C].

23

[D].

103

Answer: Option C

Explanation:

No answer description available for this question.

Question: The relationship between the del factor, temperature and time is given as
[A].

Δ = A.t. e-E/RT

[B].

Δ = 1/(A.t. e-E/RT)

[C].

Δ = A.t. eE/RT

[D].

Δ = A.t.T

Answer: Option A

Explanation:

No answer description available for this question.

Question: The overall del factor (Δ) may be represented as
[A].

Δoverall = Δheating + Δholding- Δcooling

[B].

Δoverall = Δheating + Δholding+ Δcooling

[C].

Δoverall = Δheating – Δholding+ Δcooling

[D].

Δoverall = Δheating – Δholding- Δcooling

Answer: Option B

Explanation:

No answer description available for this question.

Question: The del factor (Δ) increases as the final number of cells
[A].

decreases

[B].

increases

[C].

zero

[D].

constant

Answer: Option A

Explanation:

No answer description available for this question.

Question: The highest temperature which appears to be feasible for batch sterilization is
[A].

121°C

[B].

100°C

[C].

105°C

[D].

130°C

Answer: Option A

Explanation:

No answer description available for this question.

Question: The destruction of microorganisms by steam may be described as
[A].

first order chemical reaction

[B].

zero order chemical reaction

[C].

second order chemical reaction

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.