Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

Plate absorption column
McCabe-Thiele method
Enthalpy concentration method
Ponchan-Savarit method

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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
1000
2000
1500

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