1.What is the most important function of a burner-control system? Describe the three types of burner-control systems. 2. Define air resistance and identify what losses are included. What is draft and...

1.What is the most important function of a burner-control system? Describe the three types of burner-control systems. 2. Define air resistance and identify what losses are included. What is draft and draft loss ? In a boiler, how is draft created? 3. A stack is 150 ft high, and the exit gas temperature is 550°F. The outside temperature is 45°F. What draft can be expected at the base of the stack when the plant is operating at the designed capacity?