Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

A

Relative volatility is close to one (e.g., separation of close boiling isomers)

B

Feed is not at its bubble point

C

Number of equilibrium stages in only stripping section is to be calculated

D

Number of equilibrium stages required is likely to be very small

Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

A

Sensible heat changes for vapour & liquid are negligibly small

B

Reflux is not a saturated liquid

C

Molar latent heat of the two components are equal

D

Heat of mixing of normal liquid is assumed to be zero

In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

A

Total

B

Minimum

C

Operating

D

Maximum permissible

Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

A

Sensible heat differences are small, because the temperature changes from tray to tray is small

B

Trouton's rule is applicable

C

Liquid/vapor loading across the column remains constant

D

All of the above

Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

A

Relative volatility is reasonably constant

B

Mixture (to be separated) shows negative deviation from ideality

C

Mixture (to be separated) shows positive deviation from ideality

D

Multicomponent distillation is involved

With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

A

Fixed charges initially

B

Running cost of cooling water for condenser

C

Vapour & liquid load both

D

Running cost of steam for reboiler

Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in

A

Air

B

Oxygen

C

Either A or B

D

Either A or C without gain or loss of heat

At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.

A

Operating

B

Total

C

Minimum

D

Maximum permissible

The minimum number of theoretical plates is required for achieving a given separation in distillation column with

A

No reflux

B

Total reflux

C

Zero reflux ratio

D

Minimum reflux ratio

At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?

A

0

B

1

C

∞

Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

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