1621. In a forward feed multiple effect evaporator, the pressure is
Highest in last effect
Lowest in last effect
Same in all effects
Dependent on the number of effects
✅ The correct answer is option B.
Chemical Engineering
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1622. Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.
Oct-50
100-500
1000-1500
5000-15000
✅ The correct answer is option D.
1623. Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is
0.72
4.364
18
83
✅ The correct answer is option B.
1624. A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides
Higher economy
Lower capacity
Both A & B
Lower economy
✅ The correct answer is option A.
1625. In forced circulation, the heating element is injected
Internally
Externally
Both A and B
Neither A nor B
✅ The correct answer is option A.
1627. Stefan-Boltzman law applies to __________ body.
Black
White
Grey
Any colour
✅ The correct answer is option A.
1628. For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is
Forward
Backward
Parallel
None of these
✅ The correct answer is option B.
1629. Which of the following is generally considered as opaque surface towards radiations?
Gases
Solids
Liquids
Both B and C
✅ The correct answer is option D.
1630. Rate of crystallisation does not depend upon the
Extent of supersaturation
Turbulence within the solution
Number and active surface area of the crystals
None of these
✅ The correct answer is option D.