Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats ?

Related Mcqs:

1. Multiple effect evaporators ar used to___________________?

   A. Increase the steam economy & decrease the capacity
   B. Increase the steam economy & the capacity
   C. Decrease the steam economy & the capacity
   D. Decrease the steam economy & increase the capacity

2. 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

3. A multiple effect evaporator as compared to a single effect evaporator of the same capacity has _________________?

   A. Lower heat transfer area
   B. Lower steam economy
   C. Higher steam economy
   D. Higher solute concentration in the product

4. In a multiple effect evaporator, the effect of boiling point elevation is to______________________?

   A. Reduce the capacity
   B. Reduce the economy
   C. Increase the economy
   D. None of these

5. Black liquor generated during paper manufacture is concentrated in a___________________?

   A. Single effect evaporator
   B. Single effect evaporator followed by a crystalliser
   C. Multiple effect evaporator
   D. Multiple effect evaporators followed by a crystalliser

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. Multiple effect evaporation accounts for___________________?

   A. Steam economy
   B. Lower operating costs
   C. Investment economy
   D. None of these

8. 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

9. Economy of a multiple effect evaporator depends upon the _____________________?

   A. Heat balance consideration
   B. Rate of heat transfer
   C. Both A. and B.
   D. Neither A. nor B.

10. Multiple effect evaporation is generally recommended, when the______________________?

    A. Large scale evaporation of liquor is needed
    B. Corrosive liquids are to be concentrated
    C. Fuel is cheaply available
    D. Evaporation on small scale is to be done