In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

A Temperature is less
B Total pressure is less
C Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
D Saturated steam is used for steam distillation

Correct Answer: Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition

Bissoy MCQ
#Chemical Engineering #Mass Transfer

Related Questions

The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
A Raising the temperature
B Lowering the total pressure
C Both A & B
D Neither A nor B
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will
A Increase
B Decrease
C Remains same
D Depend on saturated boiling point; may increase or decrease
Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method
A Is more accurate in finding the number of equilibrium stages
B Accounts for the enthalpy changes in the process
C Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method
D All of the above
If the amount of the steam used in steam distillation is increased, the temperature of distillation
A Increases
B Decreases
C Remains unchanged
D Depends on relative volatility
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed
A q > 1
B q
C q = 1
D q = 0
In a vapour compression system, the condition of refrigerant is dry saturated vapour
A Before entering the compressor
B After leaving the compressor
C Before entering the condenser
D After leaving the condenser
In vapour compression cycle the condition off refrigerant is dry saturated vapour
A After passing through the condenser
B Before passing through the condenser
C After passing through the expansion or throttle valve
D Before entering the compressor
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in
A Greater degree of separation with a fixed number of trays
B Increased reboiler load
C Increased reflux ratio
D None of these

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