Extracted text: PROBLEM: A rectangular reinforced concrete beam has a width of 310 mm and an effective depth of 490 mm. Concrete compressive strength (fc') is 21 MPa, and steel yield strength (fy) is 345 MPa. Use USD Method. DETERMINE: 1. Ultimate moment capacity if the beam is reinforced with 4– 25 mm diameter tension steel. 2. Ultimate moment capacity if the beam is reinforced with 5 – 25 mm diameter tension steel. 3. Ultimate moment capacity if the beam is reinforced with 6 – 25 mm diameter tension steel. 4. Ultimate moment capacity if the beam is reinforced with 8 – 25 mm diameter tension steel. 5. Ultimate moment capacity if the beam is reinforced with 10 – 25 mm diameter tension steel.