• (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