CLASS SECTION/SCHEDULE (FRI-AM, FRI-PM, SAT-AM, SAT-PM, SUN-AM, SUN-PM)

It is the stress at which failure occurs.

A. Ultimate Stress

B. Yield Point

C. Rupture stress

D. None of the above

The steel propeller shaft ABCD carries the axial loads shown in Fig.

(a). Determine the change in the length of the shaft caused by these loads. Use E = 29×106 psi for steel.

A. Elongation = 0.014 in

B. Elongation = 0.2 in

C. Elongation = 0.88 ft

D. None of the above

The concrete post in Fig. (a) is reinforced axially with four symmetrically placed steel bars, each of cross-sectional area 900 mm2. Compute the stress in each material when the 1000-kN axial load is applied. The moduli of elasticity are 200 GPA for steel and 14 GPA for concrete.

A. σco = 9 MPa σst = 1 MPa

B. σco = 1 m2 σst = 9 m2

C. σco = 7 MPa σst = 104 MPa

D. σco = 45 MPa σst = 70 MPa

A solid steel shaft in a rolling mill transmits 20 kW of power at 2 Hz (Hertz). Determine the smallest safe diameter of the shaft if the shear stress is not to exceed 40 MPa and the angle of twist θ is limited to 6° in a length of 3 m. Use G = 83 GPa.

A. d = 58.7 mm

B. d = 58.7 in

C. d = 68.5 mm

D. d = 68.5 m

It is built into a rigid support at one end, with the other end being free. It is one of the type of beams.

A. Howe truss

B. I-Beam

C. H-Beam

D. Cantilever beam

The applied force is perpendicular to the resisting area

A. Strain

B. Ultimate stress

C. Normal Stress

D. All the above

For the truss shown in Figure, calculate the stresses in member DF. The cross-sectional area of each member is 1.8 in2. Indicate tension (T) or compression (C).

A. DF = 2000 psi (T)

B. DF = 25000 psi (C)

C. DF = 18500 psi (C)

D. None of the above

Shearing stress is also known as

A. Tangential Stress

B. Stress acting perpendicular to the area

C. All the above

D. None of the above

The members of the structure in Figur weigh 200 lb/ft. Determine the smallest diameter pin that can be used at A if the shearing stress is limited to 5000 psi. Assume single shear.

A. D = 0.0024 in

B. D = 4 in

C. D = 0.520 in

D. None of the above

Calculate the minimum wall thickness for a cylindrical vessel that is to carry a gas at a pressure of 1400 psi. The diameter of the vessel is 2 ft, and the stress is limited to 12 ksi.