Mass Transfer

551.When the _________ the relative humidity of air decreases, despite an increase in the absolute humidity.

1. Temperature rises
2. Pressure rises
3. Temperature falls
4. Pressure falls

View answer

552.When the feed to a distillation column is a saturated liquid, slope of the feed line is

1. Zero
2. Unity
3. Infinity
4. None of these

View answer

553.When the gas to be dissolved in liquid is a/an _________ then normally co-current adsorber are used.

1. Mixture of two gases
2. Pure gas
3. Ideal gas
4. Sparingly soluble gas

View answer

554.When the liquid over a plate is of uniform concentration, then

1. Murphree efficiency > point efficiency
2. Murphree efficiency < point efficiency
3. Murphree efficiency = point efficiency
4. Murphree efficiency ≠ point efficiency

View answer

555.When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

1. Vapour pressure of component A to that of component B
2. Vapour pressure of component A to the total pressure
3. Vapour pressure of component A to the partial pressure of A
4. Partial pressure of component A to the total pressure

View answer

556.When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is _________ distillation.

1. Continuous
2. Steam
3. Azeotropic
4. None of these

View answer

557.When the psychometric ratio is _________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

1. 1
2. < 1
3. > 1
4. ∞

View answer

558.When the solvent dissolves very little of solute, then

1. Solvent of low latent heat of vaporisation should be used
2. Solvent of low freezing point should be used
3. Large quantity of solvent is required to extract the solute
4. Very small quantity of solvent is required

View answer

559.When the temperature and humidity of air is low, we usually use _________ draft cooling tower.

1. Natural
2. Forced
3. Induced
4. None of these

View answer

560.Which is not concerned directly with mass transfer?

1. Schmidt number
2. Sherwood number
3. Lewis relationship
4. Froude number

View answer