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1. An inventor claims to have devised a refrigeration cycle operating between hot and cold reservoirs at 300 K and 250 K, respectively, that removes an amount of energyQC by heat transfer from the cold reservoir that is a multiple of the net work input-that is, QC 5 NWcycle, where all quantities are positive. Determine the maximum theoretical value of the number N for any such cycle.
2. Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs at 278C and 288C, respectively. The other cycle operates between the same hot reservoir at 278C and a cold reservoir at 2288C. If each refrigerator removes the same amount of energy by heat transfer from its cold reservoir, determine the ratio of the net work input values of the two cycles.
It is required to design the DC motor to run a small size electric vehicle to be used inside an airport building to help the transportation of old people.
consider an air-standard otto cycle and a modified cycle in which the isentropic compression and expansion processes
Calculate the maximum torsional shearing stress in a hollow circular shaft 4 in. outer diameter and 3 in. inner diameter if the developed torque on the shaft is 20,000 in. lb.
a 380-liter tank contains steam initially at 300 kpa and 400degc. a valve is opened and steam flows out of the tank at
Gadolinium metal undergoes a polymorphic phase transformation from HCP to BCC upon heating at 1260oC. The lattice parameters for the HCP phase are a=0.3745 nm and c=1.18525 nm. The lattice parameter for the BCC phase is 0.4060 nm. Calculate the densi..
A solid circular shaft made of 304 stainless steel uniformly tapers from a diameter of 1.5 inches to a diameter of 1.0 inches over a length of 3 feet. Objective: If the shaft transmits 100 hp at 2000 RPM, determine the maximum shear stress in the sha..
a uniform rod has the length l200m. the lateral surface area of the rod is perfectly insulated. intially the rod has
a hair dryer is basically a duct of constant diameter in which a few layers of electric resistors are placed. a small
a cylindrical tin can with diameter d1 85mm has a circular hole drilled in the bottom with diameter d2 6.35 mm.
engineers are trying to create artificial gravity in a ring-shaped space station by spinning it like a centrifuge. the
Determine the water vapor transfer rate after coating the exterior of the original polymer sheet and reducing its solubility by a factor of 9, while leaving the interior surface untreated.
a force acts at the origin of a coordinate system in a direction defined by the angles qx 65.0deg and qz 69.7deg.
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