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
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
A. Exit-fluid temperature > wall temperature
B. Exit fluid temperature < wall temperature
C. Exit fluid temperature = wall temperature
D. Graetz number > 100
A. High vacuum in the evaporator
B. High evaporation rate
C. Foaming of the solution
D. High heat transfer rate
In case of evaporators, liquid entrainment results primarily due to_________________? Read More »
Chemical Heat Transfer A. Provide very large heat transfer co-efficient
B. Results in making part of the heating surface inactive
C. Results in abruptly increased velocity
D. None of these
Heat exchangers operating, when the asymptotic range is reached, ? Read More »
Chemical Heat Transfer A. LMTD is greater
B. Less surface area is required for a given heat transfer rate
C. Both A. and B.
D. More surface area is required for a given heat transfer rate
In counter flow compared to parallel flow, ? Read More »
Chemical Heat Transfer A. Conduction
B. Natural convection
C. Forced convection
D. None of these
A. 1
B. < 1
C. > 1
D. None of these
In a single effect evaporator, the economy is________________? Read More »
Chemical Heat Transfer A. Heat exchanger
B. Condenser
C. Multiple effect evaporator
D. Steam jacketed kettle
Small scale evaporation is done in a_________________? Read More »
Chemical Heat Transfer A. < 1
B. > 1
C. 1
D. ∞
A. Dense structure
B. High proportion of air space
C. High specific heat
D. None of these
Low thermal conductivity of heat insulating materials is due to its_________________? Read More »
Chemical Heat Transfer