Mass Transfer

171.For absorbing a sparingly soluble gas in a liquid, the

1. Gas side co-efficient should be increased
2. Liquid side coefficient should be increased
3. Gas side co-efficient should be decreased
4. Liquid side co-efficient should be decreased

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172.For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of _________ microns (1 mm = 1000 microns).

1. 43952
2. 22190
3. 200-300
4. > 500

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173.For an absorber, both equilibrium and operating line will be straight for

1. Concentrated solution and non-isothermal operation
2. Dilute solution and non-isothermal operation
3. Dilute solution and isothermal operation
4. Concentrated solution and isothermal operation

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174.For contacting a highly soluble gas with a liquid

1. Bubble the gas through liquid
2. Spray the liquid on gas stream
3. Either (A) or (B) would suffice
4. None of these

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175.For continuous drying of granular or crystalline material, the dryer used is the _________ dryer.

1. Tunnel
2. Tray
3. Rotary
4. None of these

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176.For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause _________ plate requirement.

1. No change in theoretical
2. Marginal decrease in the number of
3. Major decrease in the number of
4. None of these

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177.For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

1. Calculated
2. Unknown
3. Known
4. Not required

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178.For gas absorption, low viscosity solvents are preferred, because of their

1. Better flow characteristics
2. Low pumping pressure drop
3. Rapid absorption rates
4. All (A), (B) and (C)

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179.For stripping of a gas in a counter current stripper, the operating line

1. Lies above the equilibrium curve
2. Lies below the equilibrium curve
3. Can lie above or below the equilibrium curve
4. Is always parallel to the equilibrium curve

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180.For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

1. Water has a high latent heat of evaporation
2. Lewis number is close to unity
3. They are always equal under all circumstances
4. Solubility of the components of air in water is very small

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