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A transformer is rated at 883 VA and has a primary voltage of 471 V and a secondary voltage of 187 V. Calculate the efficiency (in %) of the transformer operating at 0.55 rated load when the power factor is 0.70, the rated copper losses are 46 W and the rated iron losses are 15 W.
The probability that a new car battery functions for over 10,000 miles is .8, the probability that it functions for over 20,000 miles is .4, and the probability that it functions over 30,000 miles is .1. If a new battery is still working after 10,..
For the state of plane stress shown- construct mohr's circle using graph paper, determine the principle planes and principal stresses,
The 10mm diameter rod is made of Kevlar 49. Determine the change in length and the change in diameter.
If the outer fibers of the shaft yield plastically over a depth of 1/4 of the diameter during the application of the bending moment, qualitatively discuss the development and distribution of mechanical residual stresses along the diameter of the s..
Calculate the work done and the heat transfer. Hint: Use the ideal gas law pv = RT to nd the temperature at the end of compression. Take R = 0.287 kJ/kg.K and cv = 0.718 kJ/kg.K.
A well of radius 0.4 ft produces water from an unconfined aquifer with K = 12 ft/day. The well is located 850 ft from a large water body that acts as a constant head boundary.
The saturated unit weight (sat) of the sand is 20.0 kN/m3 and the anticipated depth to water in the well during pumping is 20 m below ground surface.
A flow of 28 m3s-1 occurs in an earth-lined canal having a base width of 3 m, side slopes of 1(vertical) to 2 (horizontal) and the Manning's n value of 0.022. Calculate the critical depth and critical slope.
When Eurasia restaurant, serving Eurasian cuisine, first opened along Chicago's Michigan Avenue, its novelty brought many diners.
Traffic data collected at the same time indicated an average time headway of 4 sec. Determine the (a) density on the highway (b) flow on the road (c) space mean speed.
At the proportional limit, a 32-mm-thick by 87-mm-wide bar elongates 10.2 mm under an axial load of 532 kN. The bar is 2.4 m long. Poisson%u2019s ratio, , for the material is 0.27.
A river flows towards a lake with a velocity of 3 m/s and rate of 500 m3/s at a location of 90 m above the lake surface. Determine the total power generation potential of the river at that location.
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