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
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
A. Graetz number
B. Eckert number
C. Grashoff number
D. Bond number
A. Parallel
B. Counter
C. Cross
D. None of these
A. Decreased capacity
B. Increase in liquor film co-efficient
C. Decreased effect of hydrostatic head
D. Increased true temperature drop
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
A. Zero
B. Unity
C. Same for all wavelengths
D. Different for all wavelengths