Mass Transfer

121.Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

1. Mass transfer co-efficient
2. Thermal diffusivity
3. Kinematic viscosity
4. Volumetric diffusivity

View answer

122.Diffusion in concentrated solutions differs from that in dilute solutions, because of the change in the _________ with the concentration of the solution.

1. Degree of ideality
2. Viscosity
3. Both 'a ' & 'b'
4. Neither 'a' nor 'b'

View answer

123.Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in

1. Viscosity with concentration
2. Degree of ideality of the solution
3. Both (A) and (B)
4. Neither (A) nor (B)

View answer

124.Dimension of mass diffusivity is the same as that of

1. Kinematic viscosity
2. Dynamic viscosity
3. Surface tension
4. Pressure

View answer

125.Dorr thickener is an equipment used for

1. Classification
2. Sedimentation
3. Clarification
4. Leaching

View answer

126.Dried finished product sampled from various parts of a _________ dryer exhibits nonuniformity in the moisture content.

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

View answer

127.Drift in a cooling tower is

1. The water entrained by the circulating air
2. Dependent on the water lost by evaporation
3. Desirable
4. All (A), (B) & (C)

View answer

128.Dry bulb temperature of the gas is _________ the wet bulb temperature.

1. Less than
2. More than
3. Equal to
4. None of these

View answer

129.Dry bulb temperature of unsaturated air is more than its _________ temperature.

1. Dew point
2. Wet bulb
3. Both 'a' & 'b'
4. Neither 'a' nor 'b'

View answer

130.Dryer widely used in a textile industry is _________ dryer.

1. Festoon
2. Cylinder
3. Conveyor
4. Tunnel

View answer