In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

In continuous distillation, the internal reflux ratio (R_i) and the external reflux ratio (R_e) are related as

A

$${{\text{R}}_{\text{i}}} = \frac{{{{\text{R}}_{\text{e}}}}}{{1 - {{\text{R}}_{\text{e}}}}}$$

B

$${{\text{R}}_{\text{i}}} = \frac{{1 - {{\text{R}}_{\text{e}}}}}{{{{\text{R}}_{\text{e}}}}}$$

C

$${{\text{R}}_{\text{i}}} = {{\text{R}}_{\text{e}}}$$

D

$${{\text{R}}_{\text{i}}} = \frac{{{{\text{R}}_{\text{e}}}}}{{1 + {{\text{R}}_{\text{e}}}}}$$

In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions:(i) Reflux stream is completely liquid and is at its bubble point.(ii) Reflux stream is below its bubble point.

A

Condenser and reboiler loads are the same in both the cases

B

Reboiler load is the same in both the cases but condenser load is higher in case (ii)

C

Condenser load is the same in both the cases but reboiler load is higher in case (ii)

D

Both condensor and reboiler loads are higher in case (ii) as compared to case (i)

In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions:
(i) Reflux stream is completely liquid and is at its bubble point.
(ii) Reflux stream is below its bubble point.

A

Condenser and reboiler loads are the same in both the cases

B

Reboiler load is the same in both the cases but condenser load is higher in case (ii)

C

Condenser load is the same in both the cases but reboiler load is higher in case (ii)

D

Both condensor and reboiler loads are higher in case (ii) as compared to case (i)

In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

A

1.1 to 1.5

B

1.6 to 2

C

2.2 to 2.6

D

2.7 to 3

A planar truss tower structure is shown in the figure. Consider the following statements about the external and internal determinacies of the truss. P. Externally determinate Q. External static indeterminacy = 1 R. External Static Indeterminacy = 2 S. Internally Determinate T. Internal Static Indeterminacy = 1 U. Internal Static Indeterminacy = 2 Which one of the following options is correct?

A

P-False; Q-True; R-False; S-False; T-False; U-True

B

P-False; Q-True; R-False; S-False; T-True; U-False

C

P-False; Q-False; R-True; S-False; T-False; U-True

D

P-True; Q-True; R-False; S-True; T-False; U-True

Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

A

(1 + Ro) = Ro/Ri

B

(1 - Ro) = Ro/Ri

C

(1 + Ri) = Ro/Ri

D

(1 - Ri) = Ro/Ri

Pick out the correct relationship. (where, R_i = internal reflux ratio R_o = external reflux ratio)

A

$$1 + {{\text{R}}_{\text{o}}} = \frac{{{{\text{R}}_{\text{o}}}}}{{{{\text{R}}_{\text{i}}}}}$$

B

$$1 - {{\text{R}}_{\text{o}}} = \frac{{{{\text{R}}_{\text{o}}}}}{{{{\text{R}}_{\text{i}}}}}$$

C

$$1 + {{\text{R}}_{\text{i}}} = \frac{{{{\text{R}}_{\text{o}}}}}{{{{\text{R}}_{\text{i}}}}}$$

D

$$1 - {{\text{R}}_{\text{i}}} = \frac{{{{\text{R}}_{\text{o}}}}}{{{{\text{R}}_{\text{i}}}}}$$

The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is

A

2

B

0.5

C

50

D

150

Consider a full binary tree with n internal nodes, internal path length i, and external path length e. The internal path length of a full binary tree is the sum, taken over all nodes of the tree, of the depth of each node. Similarly, the external path length is the sum, taken over all leaves of the tree, of the depth of each leaf. Which of the following is correct for the full binary tree?

A

e = i + n

B

e = i + 2n

C

e = 2i + n

D

e = 2ⁿ + i

Find the flow rate of liquid entering into the enriching section if the internal reflux ratio is 1.5 times min. Given minimum reflux ratio is 0.95 and the gas flow rate is 35 mol/hr.

A

49.87 mol/hr

B

22.167 mol/hr

C

55.26 mol/hr

D

None of the mentioned

In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

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