Mechanical Engineering Answers

18. What are the functions of grout inside tendon ducts?

17. In the design of a simply supported skew bridge, which direction of reinforcement should be provided?

10. In a curved prestressed bridge, how should the guided bearings in piers of the curved region be oriented with respect to the fixed bearing in abutment?

Find the young modulus of the rod of diameter 50 mm and of length 400 mm which is subjected to tensile load of 90 kN, and the extension of the rod is equal to .4 mm

17. When branch pipelines are connected to main pipelines, sometimes Y-junctions or fitting branched pipelines to main pipelines by formation of holes in main pipelines are used. Which one is a better choice?

The ratio of specific heats is k=Cp/Cv=R, a constant. Combine these two expressions and show that Cv=R/(k-1) and Cp=kR/(k-1)

The weight of a piece of metal is 225 lbf at a location where gravitational acceleration is 31 ft/s2 . Find the weight of the metal in lbf and the mass of the metal in lbm if it will be placed on the surface of the moon where g is 5.5 ft/s2 .

In the case of an elastic bar fixed at

upper end and loaded by a falling weight at lower end, the shock load produced

can be decreased by

(a ) decreasing the cross-section area

of’ bar

(b) increasing the cross-section area of bar

(c) remain unaffected with cross-section area

(d) would depend upon other factors

(e) none of the above.

2. Which of the following laws is applicable

for the behavior of a perfect gas

(a) Boyle’s law  

(b) Charles’law

(c) Gay-Lussac law

(d) all of the above

(e) Joule’s law

The 8 m long cantilever beam shown in the figure below carries a uniformly distributed load of 10 kN/m over a span of 2 m, a uniformly varying load that varies linearly from zero to 20 kN/m over a span of 5 m, and a 15 kN concentrated load at the free end as shown.

1. Nearly sketch the shear force and bending moment diagrams

2. What is the maximum shear force and where does it occur?

3. What is the maximum bending moment and where does it occur?

4. Find any points of contraflexure.