Engineering, 07.11.2019 06:31 mshepherdmiller
Asystem executes a power cycle while receiving 1050 kj by heat transfer at a tempreture of 525 k and discharging 700 kj by heat tranfer at 350 k. there are no other heat transfers.
a) usin equation 5.13 determine whether the cycle is internally reversible, irreversible, or impossible
b) determine the thermal efficiency using equation 5.4 and the given heat transfer data. compare this calue with the carnot efficiency calculated using equation 5.9 and comment
Answers: 2
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Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.
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On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)
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Asystem executes a power cycle while receiving 1050 kj by heat transfer at a tempreture of 525 k and...
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