Related Questions

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
In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.
A nth
B $${\left( {\frac{1}{{\text{n}}}} \right)^{{\text{th}}}}$$
C 0.5 nth
D 1.5 nth
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 multieffect system
D Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system
For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is
A 3
B 0.33
C 1
D 1.33
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
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is
A Same
B More
C Less
D More or less depending on ambient conditions
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the
A Solution has an elevation of boiling point
B Evaporators operate under vacuum
C Evaporators opreate at atmospheric pressure
D None of these
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
Economy of a multiple effect evaporator is not influenced much by the
A Boiling point elevations
B Temperature of the feed
C Rate of heat transfer
D Ratio of the weight of the thin liquor to thick liquor
Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
A Nickel
B Copper
C Stainless steel
D Brass

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