Fqra cold viscous feed, backward feed gives _____________ than forward feed?

Related Mcqs:

1. A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?

   A. Higher economy
   B. Lower capacity
   C. Both A. & B.
   D. Lower economy

2. For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in_____________________?

   A. Increased economy
   B. Decreased economy
   C. Lower capacity
   D. No effect on economy

3. The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?

   A. Heat sensitive material can be handled
   B. There is no additional cost of pumping
   C. Most concentrated liquid is at highest temperature
   D. Equal heat transfer co-efficients exist in various effects

4. For hot feed, forward feeding as compared to backward feeding results in ______________ economy?

   A. Increased
   B. Decreased
   C. No effect on
   D. None of these

5. In a backward feed multiple effect evaporator ___________________ ?

   A. Feed is introduced in the first effect
   B. Feed flows from low pressure to high pressure
   C. No pumps are required between successive effects
   D. None of these

6. In a forward feed multiple effect evaporator, the pressure is ____________________?

   A. Highest in last effect
   B. Lowest in last effect
   C. Same in all effects
   D. Dependent on the number of effects

7. In a forward feed multiple effect evaporator unit__________________?

   A. Viscosity of liquid is highest in first effect
   B. Transfer from effect to effect is done by pumps
   C. No pump is required to withdraw the product from the last effect
   D. None of these

8. In a forward feed multiple effect, the pressure build up will be____________________?

   A. Least at the inlet of the first effect
   B. Least at the outlet of the last effect
   C. Highest at the inlet of the last effect
   D. Highest at the outlet of the last effect

9. Viscous & heat sensitive liquids are concentrated in _____________ evaporators?

   A. Open pan
   B. Long tube
   C. Agitated film
   D. None of these

10. For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?

    A. Forward
    B. Backward
    C. Parallel
    D. None of these