7071. The operating cost of a distillation column at minimum reflux ratio is
Minimum
Maximum
Infinite
Zero
✅ The correct answer is option A.
Chemical Engineering
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7073. The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)
Kc = Kp = Km
Kc = Kp/RT = Km . RT/P
Kc = Kp . RT = Km . RT/p
None of these
✅ The correct answer is option C.
7074. Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.
Agitated vessel
Sieve tray column
Bubble cap column
Packed tower
✅ The correct answer is option A.
7075. The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.
Composition
Temperature
Total pressure
All of the above
✅ The correct answer is option B.
7076. Very tall packed towers are divided into series of beds to
Reduce the overall pressure drop
Avoid channelling
Reduce liquid hold-up
Avoid flooding
✅ The correct answer is option B.
7077. Steam distillation is used to
Reduce the number of plates
Avoid thermal decomposition of a component
Increase the efficiency of separation
Increase the total pressure of distillation
✅ The correct answer is option B.
7078. McCabe-Thiele method
Uses molal units for material and energy balance
Uses weight fractions to express liquid and vapour composition
Can use any type of units
Is more accurate than Ponchan-Savarit method
✅ The correct answer is option A.
7079. In liquid-liquid extraction, the number of phases at plait point is
1
2
3
4
✅ The correct answer is option A.
7080. Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?
Grid tray tower
Perforated tray tower
Wetted wall tower
Bubble cap tower
✅ The correct answer is option D.