Mass Transfer

191.Free flowing granular materials can be best dried in a _________ drier.

1. Rotary
2. Cylinder
3. Drum
4. Freeze

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192.Freundlich equation applies to the adsorption of solute from

1. Dilute solutions, over a small concentration range
2. Gaseous solutions at high pressure
3. Concentrated solutions
4. None of these

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193.Gaseous diffusion co-efficient increases with increase in the

1. Pressure
2. Temperature
3. Both (A) & (B)
4. Neither (A) nor (B)

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194.Gaseous diffusivity at atmospheric pressure is of the order of _________ cm²/second.

1. 1
2. 1 to 5
3. 5 to 10
4. > 10

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195.H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

1. 2
2. 1.56
3. 1
4. 0.56

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196.H2S present in naphtha reformed gas is removed by absorbing with

1. Ethanolamine
2. K₂CO₃
3. HCl
4. Vacuum gas oil

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

1. Latent heat
2. Humid heat
3. Specific heat
4. Sensible heat

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198.Heat load in a cooling tower

1. Means the amount of heat thrown away (KCal/hr.) by the cooling tower
2. Is equal to the number of kg, of water circulated times the cooling range
3. Both (A) & (B)
4. Neither (A) nor (B)

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199.Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

1. Liquid extraction
2. Distillation
3. Evaporation
4. Absorption

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200.Henry's law states that the

1. Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
2. Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
3. Vapour pressure is equal to the product of the mole fraction and total pressure
4. Partial pressure is equal to the product of the mole fraction and total pressure

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