Multiple effect evaporation accounts for___________________?

Related Mcqs:

1. 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

2. 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

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. Evaporation of 1kg of water from a solution in a single effect evaporator requires about ________________ kg of steam?

   A. 0.4 – 0.6
   B. 1-1.3
   C. 1.8-2
   D. 2 – 2.4

6. Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?

   A. Dittus-Boelter equation
   B. Sieder-Tate equation
   C. Nusselt equation
   D. None of these

7. 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

8. A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________________?

   A. 6000
   B. 24000
   C. 60000
   D. 48000

9. 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

10. 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