A. Increases the heating area required
B. Reduces the economy
C. Both A. and B.
D. Decreases the heating area required
Related Mcqs:
- 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 - Fqra cold viscous feed, backward feed gives _____________ than forward feed?
A. A higher capacity
B. A lower capacity
C. Lower economy
D. None of these - 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 - Forced circulation evaporators are normally used for concentrating liquids having ___________________?
A. Scaling characteristics
B. High viscosity
C. Both A. & B.
D. Neither A. nor B. - Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator ?
A. Long vertical evaporator
B. Horizontal tube evaporator
C. Agitated film evaporator
D. Calandria vertical tube evaporator - It is not preferable to use superheated steam in evaporators, because of its very_________________?
A. High temperature
B. High pressure
C. Low film co-efficient
D. None of these - LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the ______________ flow?
A. Parallel
B. Mixed
C. Counter flow
D. Same in either A , B. or C. - Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats ?
A. P and Q
B. P and R
C. P and S
D. R and S - The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?
A. Steam ejector
B. Entrainment separator
C. Compressor
D. Vacuum pump - In case of evaporators, liquid entrainment results primarily due to_________________?
A. High vacuum in the evaporator
B. High evaporation rate
C. Foaming of the solution
D. High heat transfer rate
