Category: Chemical Heat Transfer

A. √(A1 . A2)
B. √(A1 + A2)
C. ½ √(A1 . A2)
D. 2 √(A1 . A2)

A. 0.35
B. 0.45
C. 0.55
D. 0.85

A. 1
B. < 1
C. > 1
D. > 5

A. In case of heat transfer by purely forced convection, GR/Re 2 ≤ 1
B. The equivalent diameter of heat transfer for a duct of square cross-section (having each side as
‘x’) is equal to 4x
C. Distillation process is not the same as evaporation
D. The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are
formed and detached from the heating surface

A. (r1 – r2)/ln(r1/r2)
B. (r1 – r2)/ln(r2/r1)
C. (r2 – r1)/ln(r1/r2)
D. (r1 – r2)/-ln(r1/r2)

A. Extremely low
B. Low
C. High
D. No

A. Economiser
B. Regenerator
C. Ceramic recuperator
D. None of these

A. Prandtl number
B. Grashoff number
C. Thermal conductivity
D. Viscosity

A. 1
B. < 1
C. > 1
D. None of these