# Rate of heat transfer by conduction into circular fin - Heat Transfer

**Q. Consider that heat transfer is taking place through a fin having circular cross-sectional area, one dimensionally as shown in figure.**

The rate of heat transfer by conduction into a section at x is equal to

*- Published on 12 Aug 15***a.** sum of rate of heat transfer by convection out of the element (x+dx) and heat transfer by convection from the surface between x to (x+dx)

**b.** sum of rate of heat transfer by conduction out of the element (x+dx) and heat transfer by conduction from the surface between x to (x+dx)

**c.** sum of rate of heat transfer by conduction out of the element (x+dx) and heat transfer by convection from the surface between x to (x+dx)

**d.** none of the above

**ANSWER: sum of rate of heat transfer by conduction out of the element (x+dx) and heat transfer by convection from the surface between x to (x+dx)**