A. (r1 – r2)/ln(r1/r2)
B. (r1 – r2)/ln(r2/r1)
C. (r2 – r1)/ln(r1/r2)
D. (r1 – r2)/-ln(r1/r2)
Chemical Heat Transfer
Chemical Heat Transfer
A. 2.36
B. 4.36
C. 120.36
D. Dependent on NRe only
A. Average
B. Geometric mean
C. Product
D. Sum
A. n = 0.4 is used for heating
B. n = 0.3 is used for cooling
C. Reynolds number for the flow involved is > 10000
D. Reynolds number for the flow involved is < 2100
A. Increase pressure
B. Increase temperature
C. Remove condensate
D. None of these
A. 2000
B. 4000
C. 5000
D. 6000
A. Pe = Re.Pr
B. Pe = Re/Pr
C. Pe = Pr/Re
D. Pe = Nu.Re
A. Heat transfer co-efficient
B. Thermal diffusivity
C. Thermal conductivity
D. Stefan-Boltzmann constant
A. Free convection
B. Entry length problem in laminar forced conduction (developing thermal boundary layer)
C. Mixed convection (both free and forced)
D. Forced convection
A. J.m-2.K-1
B. J.m-1.K-1
C. W.m-2.K-1
D. W-1m2K
