Consider the following statements regarding waste heat boilers
1. Waste--heat boilers placed in the path of exhaust gases
2. These are fire tube boilers
3. The greater portion of the heat transfer in such boilers is due to convection
Which of the statements given above are correct?
a. 1, 2 and 3 b. 1 and 2
c. 2 and 3 d. 1 and 3