A. No reflux
B. Total reflux
C. Zero reflux ratio
D. Minimum reflux ratio
Correct Answer: Total reflux ✔
Last Updated: February 18, 2019
Related MCQs
- The drying time between fixed moisture contents within the ‘constant rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
- Sticky material can be dried in a __________ dryer ?
- Drying operation under vacuum is carried out to __________?
- In case of absorption with exothermic reaction, for fluids having __________?
- At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is__________?
- In a counter-current extractor, as the axial mixing increases, the extraction efficiency__________?
- In saturated gas, the__________?
- Which of the following remains constant during sensible cooling process ?
- For contacting a highly soluble gas with a liquid __________?
- The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________?
- Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in __________?
- The binary diffusivity in gases does not depend upon the __________?
- The Knudsen diffusivity is dependent on the __________?
- Overall efficiency of the distillation column is __________?
- For a binary mixture with low relative volatility, continuous rectification to get pure products will require__________?
- Critical humidity of a solid salt means the humidity__________?
- CO2 can be absorbed by__________?
- The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is__________?
- Solvent used in extractive distillation__________?
- Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is__________?
- Which of the following remains constant during evaporative cooling process with recirculated water supply ?
- If a two phase system is in physical equilibrium; then it means that, the__________?
- In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor?
- If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement ?
- Percentage saturation is __________ the relative saturation?
- In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be__________?
- Water-ethyl alcohol solution can be concentrated (in respect of alcohol concentration) by __________ distillation?
- When the temperature and humidity of air is low, we usually use __________ draft cooling tower?
- In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the__________?
- Leaching of sugar from sugar beets is done by__________?
- In an absorber, HETP does not vary with the__________?
- Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air ?
- Which of the following quantities need not be fixed before starting the design of a cocurrent absorber ?
- During drying operation, it is easier to remove the __________ moisture ?
- In extractive distillation, solvent is__________?
- At a fixed total pressure, humidity depends only on the __________?
- The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________?
- The diffusivity D. in a binary gas mixture is related to the temperature (T) as__________?
- The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or “outgassed” adsorbent to from a definite concentration of adsorbate is called its__________?
- An Azeotropic mixture is a __________ mixture?
- Inside the distillation columns, the __________?
- Total reflux in a distillation operation requires minimum__________?
- Boiling point diagram is not affected by the ambient__________?
- Dry bulb temperature of unsaturated air is more than its __________ temperature?
- Inside the distillation column, the__________?
- A mixture of 10% C6H6 vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C?
- Chemisorption (chemical adsorption) is__________?
- The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line) ?
- When the feed to a distillation column is a saturated liquid, slope of the feed line is__________?
- Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for__________?
- Solvent used in extractive distillation__________?