Mechanics of Materials — Quiz 3

Questions in this quiz (10)

1. A cylindrical vessel has an inner diameter of 3 ft and a wall thickness of 1.5 in. After applying a pressure of 120 psi, the hoop stress developed in the thin-walled pressure vessel is most nearly:

   • 720 psi
   • 960 psi
   • 1,440 psi
   • 1,800 psi

2. If a torque is applied to a circular shaft, the maximum shear stress is developed at:

   • Center of shaft
   • Mid-radius
   • Outer surface of shaft
   • Uniform throughout

3. A circular shaft with inner diameter 10 in and outer diameter 12 in is subjected to a torque of 80 kip-ft. The maximum shear stress (ksi) developed in the shaft is most nearly:

   • 2.10
   • 3.25
   • 4.12
   • 5.48

4. A 3-ft circular shaft with inner diameter 10 in and outer diameter 12 in is subjected to a torque of 8,000 kip-in. The shear modulus is 11,000 ksi. The angle of twist (rad) is most nearly:

   • 0.025
   • 0.065
   • 0.130
   • 0.260

5. Which of the following statements is true for bending in beams?

   • Maximum stress occurs at neutral axis
   • Neutral axis experiences zero stress
   • Shear stress is maximum at outer fiber
   • Bending produces uniform stress

6. Which of the following statements is true?

   • Yield stress is greater than ultimate stress
   • Allowable stress is greater than yield stress
   • Allowable stress is less than yield stress
   • Poisson ratio of steel is greater than 1

7. Which of the following parameters is a factor for beam deflection?

   • Load magnitude
   • Beam span length
   • Modulus of elasticity and moment of inertia
   • All of the above

8. Lateral buckling occurs for:

   • Short-thick column
   • Long-thin column
   • Short-thin column
   • Long-thick column

9. A tensile force of 120 kN is applied on a 0.025 m diameter and 2.5 m long rod. After applying the load, the length increases to 2.512 m. The work (J) done during loading is most nearly:

   • 600
   • 720
   • 1,440
   • 2,880

10. A tensile force of 120 kN is applied on a 0.025 m diameter and 2.5 m long rod. After applying the load, the length increases to 2.512 m. The strain energy per unit volume is most nearly:

    • 0.520 MJ/m³
    • 0.720 MJ/m³
    • 0.920 MJ/m³
    • 1.120 MJ/m³