Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Minimum trays and maximum reboiler heat load
Infinite trays and minimum reboiler heat load
Minimum trays and minimum reboiler heat load
Infinite trays and maximum reboiler heat load

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Mass Transfer
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

2500
2000
1500
1000

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Mass Transfer
Which of the following processes is not an example of adsorption applied to gaseous separations?

Decolouration of yellow glycerene
Recovery of valuable solvent vapors from dilute mixture with air and other gases
Removal of objectionable odour and impurities from industrial gases
Dehumidification of air and gas

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