A. Higher economy
B. Lower capacity
C. Both A. & B.
D. Lower economy
Related Mcqs:
- 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a _______________ evaporator?
A. High pressure
B. Vacuum
C. Backward feed
D. None of these - A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because__________________?
A. Total heat transfer area of all the effects is -less than that in a single effect evaporator system
B. Total amount of vapor produced per Kg of feed steam in a multiple effect system is much
higher than in a single effect
C. Boiling point elevation in a single effect system is much higher than that in any effect in a
multi-effect system
D. Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect
system
