Evaporator tubes are generally_____________________?
Evaporator tubes are generally_____________________?
A. Horizontal
B. Vertical
C. Inclined
D. Random
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Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?
Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?A. Scaling
B. Highly viscous
C. Corrosive
D. SaltyRadiation heat transfer rates does not depend upon the_________________?
Radiation heat transfer rates does not depend upon the_________________?A. Type of absorbing surface
B. Distance between the heat source and the object receiving the heat
C. Surface area and temperature of the heat source
D. None of theseIn case of a vertical tube evaporator, with increase in the liquor level, the ____________ is increased?
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.Which of the following is concerned with both heat and mass transfer ?
Which of the following is concerned with both heat and mass transfer ?A. Lewis relationship
B. Nusselt number
C. Kutateladze number
D. Froude numberVacuum is generally maintained in the vapour space of an evaporator mainly to__________________?
Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?A. Get economical temperature difference by using moderate pressure steam
B. Facilitate forward feeding in multiple effect evaporation
C. Concentrate heat sensitive materials
D. Achieve very high concentration of the final productThickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?A. 1
B. < 1
C. > 1
D. > 5