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Consider a refrigeration system using refrigerant- 134a as the working fluid. If this refrigerator is to operate in an environment at 30°C, what is the minimum pressure to which the refrigerant should be compressed? Why?
A soil sample taken from a borrow pit has a natural void ratio of1.15. The soil will be used for a highway project where a total of 100,000 m3 of soil is needed in itscompacted state; its compacted void ratio is 0.73.
A fan is to be selected to ventilate a bathroom whose dimensions are 2 m x 3 m x 3 m. The air velocity is not to exceed 8 m/s to minimize vibration and noise. The combined efficiency of the fan-motor unit to be used can be taken to be 50 percent.
A normally consolidated clay layer is 4 m thick (one way drainage). From the application of a given pressure, the total anticipated primary consolidation settlement will be 80mm. What is the average degree of consolidation for the clay layer.
A lead-zinc mine is to be developed by a room-and-pillar layout. The mine is located at a depth of 500ft, the overlying rock has an average specific gravity of 2.56, and the pillar rock wast tested and found to have a
Apply the knowledge gained above to develop safe and sustainable solutions to site situations and appraise the solutions developed above to propose the most desirable solution in the circumstances
The following results were obtained from a liquid limit test on a clay using the Casagrande cup device.
Estimate the required surface area (A), and the diameter and the depth of the tank.
Design the pins so that the ledge can support Doug and Jeremy and eight others on each side of the building. Assume each person weighs 200 lbs.Pin properties: Ultimate shear strength = 100 lb/in^2
Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?
it is required to dewater a construction site 80 m by 80 m. the bottom of the construction will be 1.5 m below the
The 10-mm-diameter steel bolt is surrounded by a bronze sleeve. the outer diameter of this sleeve is 20 mm, and its inner diameter is 10 mm. if the yield stress for the steel is
Determine the factors of safety against sliding and against overturning, and also the soil pressure at the heel and toe. Assume hydrostatic uplift varies uniformly from full hydrostatic head at the heel of the dam to zero at the toe. consider 1m l..
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