A) ASME Section I – Power Boilers Question 3 – Combustion (Efficiency) A natural gas boiler operates with 15% excess air. The flue gas O₂ reading is 3.2%. Is this consistent? Show why or why not.
B) Prevent caustic gouging and acid phosphate corrosion Question 6 – Draft Systems (Fan Laws) A forced draft fan delivers 50 m³/s at 2.5 kPa static pressure and 1450 RPM. If the speed is reduced to 1200 RPM, what is the new flow and pressure? Fan laws: ( Q_2 = Q_1 \times \fracN_2N_1 ) ( P_2 = P_1 \times \left(\fracN_2N_1\right)^2 ) power engineering 3b1 exam questions
| Topic | Approx. % | |-------|-----------| | Boiler design, types, and construction | 20% | | Boiler fittings and accessories | 15% | | Combustion and fuel systems | 15% | | Thermodynamics (steam properties, cycles) | 15% | | Materials and welding | 10% | | Water treatment | 10% | | Draft systems and fans | 8% | | Safety and ASME/CSA codes | 7% | Question 1 – Boiler Design (Metallurgy) A firetube boiler shell is subject to internal pressure. The maximum allowable stress for the shell material at 200°C is 120 MPa. The shell inside diameter is 1.5 m, and the required thickness is 18 mm. Calculate the maximum allowable working pressure (MAWP) using the thin-shell formula for a cylinder. A) ASME Section I – Power Boilers Question