Related Questions

In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.
A Velocity of circulation
B Liquor-film co-efficient
C Both A and B
D Neither A and B
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient
A Increases
B Decreases
C Is not affected
D May increase or decrease; depends on the feed
__________ liquor is best handled in a long tube vertical evaporator.
A Foamy
B Scaling
C Viscous
D Salting
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator
A Is economical in operation
B Employs high velocity, high heat transfer rate and less heating surface requirement
C Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
D Both B & C
Increasing the liquor level in the evaporator results in the
A Decreased capacity
B Increase in liquor film co-efficient
C Decreased effect of hydrostatic head
D Increased true temperature drop
In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?
A Long tube vertical evaporator
B Short tube vertical evaporator
C Horizontal tube evaporator
D None of these
Black liquor is converted into white liquor by
A Evaporation and burning the concentrate followed by causticisation of products
B Multi-effect evaporation only
C Selective liquid extraction
D Extractive distillation
In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of
A Concrete
B Wood
C Steel
D Porcelain
In a vertical short tube evaporator (Calendria type), the
A Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used
B Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
C Liquor is inside the tube while the steam is outside the tube
D All of the above
In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.
A Less than
B 1.25-1.50 times
C 2.5 times
D One-fourth of

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