151.Fenske equation for determining the minimum number of theoretical stages in distillation column holds good, when the
Relative volatility is reasonably constant
Mixture (to be separated) shows negative deviation from ideality
Mixture (to be separated) shows positive deviation from ideality
Multi-component distillation is involved
Correct answer: (A) Relative volatility is reasonably constant
152.Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for
Constant molal overflow
Total reflux
Constant relative volatility
All (A), (B) and (C)
Correct answer: (D) All (A), (B) and (C)
153.Flash distillation is
Same as differential distillation
Used for multi-component systems like crude refining
Same as simple distillation
Most useful for handling binary systems
Correct answer: (B) Used for multi-component systems like crude refining
154.Flash distillation is suitable for separating the constituents of a binary system, which
Form minimum boiling azeotrope
Have very wide boiling points
Have very close boiling points
Form constant boiling azeotrope
Correct answer: (B) Have very wide boiling points
155.Flash distillation is suitable for the separation of components
Having very close boiling points
Which form maximum boiling azeotrope
Having very wide boiling points
Which form minimum boiling azeotrope
Correct answer: (C)
Having very wide boiling points
156.Flights in a rotary dryer are provided to
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Reduce the residence time of solid
Increase the residence time of the solid
None of these
Correct answer: (A) Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
157.Flooding in a column results due to
High pressure drop
Low pressure drop
Low velocity of the liquid
High temperature
Correct answer: (A) High pressure drop
158.Flooding in a distillation column is detected by a sharp
Increase in Murphree plate efficiency
Decrease in pressure drop
Decrease in liquid hold up in the column
Increase in pressure drop
Correct answer: (D) Increase in pressure drop
159.Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is _________ the liquid head available in the downcomer.