Related Questions

The suitable evaporator for concentration of foaming liquids is a __________ evaporator.
A Long tube
B Short tube
C Vacuum
D Falling film
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
Evaporator used for concentrating tomato juice is made of
A Nickel
B Brass
C Stainless steel-glass lined
D Cast iron-rubber lined
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
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.
A Increases
B Decreases
C Remains constant
D May increase or decrease, depends on the vacuum
__________ is an ore concentrating metallurgical process involving a chemical change.
A Electromagnetic separation
B Froth floatation
C Roasting
D None of these
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
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
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
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

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