Chemical Engineering MCQs

6108 MCQs  (Page 212 of 611)

What is the reflux ratio at total reflux ?
A. Zero
B. Infinity
C. Unity
D. Data insufficient
Which of the following is the most suitable for extraction in a system having very low density difference ?
A. Mixer-settler extractor
B. Centrifugal extractor
C. Pulsed extractor
D. Packed extraction tower
At minimum reflux ratio for a given separation__________________?
A. Number of plates is zero
B. Number of plates is infinity
C. Minimum number of the theoretical plates is required
D. Separation is most efficient
The dimension of diffusivity is same as that of the__________________?
The dimension of diffusivity is same as that of the
A. Density
B. Molal concentration
C. Kinematic viscosity
When the liquid over a plate is of uniform concentration, then ______________________?
A. Murphree efficiency > point efficiency
B. Murphree efficiency < point efficiency
C. Murphree efficiency = point efficiency
D. Murphree efficiency ≠ point efficiency
The term “cooling range” in a cooling tower refers to the difference in the temperature of____________________?
A. Cold water leaving the tower and the wet bulb temperature of the surrounding air
B. Hot water entering the tower and the wet bulb temperature of the surrounding air
C. Hot water entering the tower and the cooled water leaving the tower
D. None of these
Rate of leaching increases with increasing______________________?
A. Temperature
B. Viscosity of solvent
C. Pressure
D. Size of the solid