An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is___________________?
A. 4000
B. 9000
C. 4600
D. 3000
A. 4000
B. 9000
C. 4600
D. 3000
A. There is no internal heat generation
B. Boundary surfaces are isothermal
C. Material is anisotropic
D. Constant temperature gradient exists
A. Increasing temperature
B. Decreasing temperature
C. Decreasing Reynolds number
D. None of these
Heat transfer co-efficient (h1) for liquids increases with__________________? Read More »
Chemical Heat Transfer A. Increase the steam economy & decrease the capacity
B. Increase the steam economy & the capacity
C. Decrease the steam economy & the capacity
D. Decrease the steam economy & increase the capacity
Multiple effect evaporators ar used to___________________? Read More »
Chemical Heat Transfer A. Graetz number
B. Eckert number
C. Grashoff number
D. Bond number
A. Parallel
B. Counter
C. Cross
D. None of these
Correction is applied to LMTD for __________ flow? Read More »
Chemical Heat Transfer A. Decreased capacity
B. Increase in liquor film co-efficient
C. Decreased effect of hydrostatic head
D. Increased true temperature drop
Increasing the liquor level in the evaporator results in the_______________? Read More »
Chemical Heat Transfer A. D/5 and D
B. D/2 and 2 D
C. D/4 and 2 D
D. D and 2 D
A. When heat transfer area required is very high
B. When heat transfer area required is very low, i.e. (100-200 ft2).
C. Because it occupies less floor area
D. Because it is less costly
Double pipe heat exchangers are used__________________? Read More »
Chemical Heat Transfer A. Zero
B. Unity
C. Same for all wavelengths
D. Different for all wavelengths
A body is called grey if the monochromatic emissivity of the body is___________________? Read More »
Chemical Heat Transfer