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Mass Transfer

Mass Transfer
NSc/NPr is called the

Psychrometric ratio
Stantan number
Sherwood number
Lewis number

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Mass Transfer
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Both A & B
Unsaturated surface
Neither A nor B
Constant rate

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

L/(FG.G)
(G.a)/FG
FG/(G.a)
F/(FG.a)

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Mass Transfer
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the

Humid heat
Latent heat
Specific heat
Sensible heat

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Mass Transfer
When the feed to a distillation column is a saturated liquid, slope of the feed line is

Unity
Infinity
Zero
None of these

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Mass Transfer
Unit of molal diffusivity is

Cm²/sec gm . mole
Gm moles/cm². sec
Gm moles/cm² . sec
Gm moles/cm. sec

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