CE 603-PSAD Quiz 2

The simple truss shown supports the two loads, each of magnitude L = 10KN. Determine the force in member CD.

• 14.17KN

• 16.17KN

• 6.46KN

• 6.01KN

A steel plate of dimensions 2.5 x 1.2 x 0.1m is hoisted by a cable sling that has a clevis at each end (see figure). The pins through the clevis are 18mm in diameter and are located 2m apart. Each half of the cable is at an angle of 32degrees to the vertical. For these conditions, determine the average bearing stress between the steel plate and the pins.

• 26.76MPa

• 7.57MPa

• 13.62MPa

• 23.10MPa

A uniform concrete slab of mass “m” is to be attached as shown in the figure, to two rods whose lower ends are initially at the same level. Determine the ratio of the areas of the rods so that the slab will remain level after it is attached to the rods.

• 1/60

• 5/60

• 7/60

• 9/60

A steel rod at B helps support a load of 50KN. The rigid bars shown in the figure are separated by a roller at C and pinned at A and D. Compute the vertical displacement of roller at point C.

• 5.8125mm

• 4.8125mm

• 3.8125mm

• 2.8125mm

A steel wire 30ft long hanging vertically supports a load of 500lbs. Neglecting the weight of wire, determine the required diameter if the stress is not to exceed 20ksi and total elongation is not to exceed 0.20in. Assume E = 29x10^6psi.

• 0.1784in

• 0.1988in

• 0.2784in

• 0.2988in

A reinforced concrete column, 5m high has a cross-section of 400mm x 400mm. It is reinforced by 4 steel bars each 20mm in diameter and carries a load of 1000KN. Young’s modulus for steel is 200,000MPa and that for concrete is 15,000MPa. Neglecting concrete displaced or concrete holes. Determine the shortening of column.

• 1.24mm

• 1.08mm

• 1.56mm

• 1.89mm

For the assembly as shown, determine the stress of the aluminum rod if the temperature rises up to 40°C after the load P= 50KN is applied. Neglect the deformation and the mass of the horizontal bar AB.

• 11.40MPa

• 133.55MPa

• 22.56MPa

• 152.44MPa

As shown in the figure, a homogeneous 50kg rigid block is suspended by the three springs whose lower ends were originally at the same level. Each steel spring has 24 turns of 10mm diameter wire on a mean diameter of 100mm and G=83 GPa. The bronze spring has 48 turns of 20mm diameter wire on a mean diameter of 150mm and G= 42GPa. Compute the maximum shearing stress in each spring.

• 5.06MPa, 10.6MPa and 38.72MPa

• 7.87MPa, 20.1MPa and 38.72MPa

• 9.93MPa, 40.3MPa and 38.72MPa

• 6.71MPa, 30.8MPa and 38.72MPa

The compound shaft known rotates at 3 rps with 30KW taken off at A, 15KW off at B, and 45KW applied at C. If G = 83GPa, determine the maximum stress.

• 54.85MPa

• 18.82MPa

• 64.85MPa

• 28.82MPa

A load P is supported by two concentric steel springs arranged as shown. The inner spring consists of 30 turns of 20mm diameter wire on a mean diameter of 150mm, the outer spring has 20 turns of 30mm wire on a mean diameter of 200mm. Compute the maximum load that will not exceed a shearing stress of 140 MPa in either spring. Use G= 83 GPa.

• 2749N

• 9055N

• 6904N

• 2151N