Mass Transfer
A binary mixture of benzene and cyclohexane is separated by

Flash vaporisation
Ordinary distillation
Solvent extraction
Extractive distillation

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Mass Transfer
Blowdown in a cooling tower

All of these
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Is undesirable
Increases the scale forming tendencies of water

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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
1000
1500

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