1. If you needed to reduce deflection in a loaded aluminum rectangular box beam in your structural design, which of the following variables would you INCREASE?  Which would be the MOST effective in reducing deflection?  

                                    L               W             w              H              h

2. For question 1 above, what material could you substitute for aluminum in your design to decrease the deflection? Why?  

3.   Which has the larger Area Moment of Inertia, a 2” x 2” square beam of high strength stainless steel or a 2” x 2” square beam of balsa wood? Support your answer qualitatively or quantitatively.  

4. Should the Elastic modulus of a beam change if the unsupported length of the beam is changed?  Why?

5.    What would be the percent change in deflection if a solid rectangular beam has its unsupported length changed from 30 inches to 36 inches?   SHOW YOUR CALCULATION. What does this tell you about the importance of unsupported beam length in structural design?

6.   Is the Modulus of Elasticity indicative of what the failure load of a beam would be? Why?

7.   Which has a higher resistance to deflection (that is, a smaller ratio of Dy/P), a solid square, 1”x1” beam, or a square box beam with outer dimensions of 1”x1” and inner dimensions of 0.95”x0.95”? (Assume that L and E are the same for both.) What advantages are there to using the box beam instead of the solid beam?

a reinforced T-beam is having a flange size 90cm×12cm and web size 30 cm×25 cm . if there are 6 bars of diameter 2cm, in tensile zone, find the moment of resistance of the section . if the MR has to be increased to 1.5 times the original MR . Calculate the additional reinforcement needed both in tensile as well as in compressive zone without changing the section. Assume both side cover as 5cm , c=52.5kg/cm², t= 1250kg/cm², m=20.

Determine when to use either the engineering, procurement and construction (EPC) contract model or the engineering, procurement and construction management (EPCM) contract model. When is it appropriate to use EPC and when is it appropriate to use EPCM. Provide recommendations on how to decide for civil engineering projects.

A brass pipe has an internal diameter of400mm and a metal thickness of6mm. A triple layer ofbigh tensile wire ofdiameter 3 mm is wound closely round it at a tension of500 N. Find (a) the stress in the pipe when there is no internal pressure; (b) the maximum permissible internal pressure in the pipe if the working tensile stress in the brass is 60 MNhn2 ; (c) the stress in the steel wire under condition O). Treat the pipe as a thin cylinder and neglect longitudinal stresses and strains. E, = 200GN/m2; Erl OOGN/m:

QUESTION 4

Particulate matter is one of the air pollutants. Discuss and relate with how it affects the breathing system. Explain in detail the function of human respiratory system. [20 marks

subject:enviromental enginnering

1.How does OSHA define potable water? Include the citation for the OSHA standard where you found the answer to the question.

2.When is training required for employees involved in confined space entry? Include the citation for the OSHA standard where you found the answer to the question.

An aquifer has a T = 150 m²/day, S = 0.0001, and provides a flow of 25 L/s ( 400 gal/min) to a well. Find the drawdown at two observation wells located 20 m and 50 m from the producing well after 1 day, 30 days, 1 year, and 5 years

Design a short square tied column to carry a factored axial load of 1300k and a factored moment of 550kft. Place the reinforcement uniformly around the column. Design the ties. Assume interior exposure, f’c = 4000psi, fy = 60,000psi

Design a reinforced concrete wall footing to carry a 10 in thick reinforced concrete wall. Service loads are 6 kips/ft dead load and 15 kips/ft live load. The allowable soil pressure is 2 tons per sf. Assume that the bottom of the footing is to be 8.5 feet below grade and the weight of the soil can be assume to be 110 PCF. Assume that the steel is uncoated and the soil pressuregiven is gross allowable soil pressure. Use fy = 60 ksi for the steel.

Suppose I have a rectangular building with five floors, each 10 feet high, 50 feet long in the x direction and 30 feet wide in the y direction. Suppose x is the direction perpendicular to the wind and y is the direction parallel to the wind. Suppose coordinate (0,0) is at the lower left side of the building facing the wind. If I know the wind pressures at each floor level, what would be the coordinates of the resultant wind pressures at each floor level relative to the (0,0) coordinate. No need to calculate wind pressures. Suppose wind pressures are 100 psf at floor 1, 102 psf at floor 2, 103 psf at floor 3, 104 psf at floor 4 and 105 psf at floor 5. The wind blows from north to south.

what were some of Ida B Wells significant contributions to the civil rights movement?

what was the classification of hydraulic jump with respect to Froud Number?

The common problem related to mass concrete is thermal differential which may affect the structural integrity of concrete, With the aid of sketches, discuss this phenomenon,

Topic: Construction - Engineered Wood Products

(1 paragraph minimum please include reference if using one)

Discuss the significance and relevance in modern construction means and methods, of the use of "engineered wood products".