Mass Transfer
Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.

Strength
Thermal conductivity
Electrical resistance
None of the listed here

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Mass Transfer
Plate efficiency

Increases due to foaming
Increases due to liquid entrainment
Is a function of the mass transfer between liquid and vapour
Increases due to weeping and dumping of liquid

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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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