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An open Brayton cycle engine operates with a compressor-pressure ratio of 6, an inlet temperature of 20 C and inlet pressure of 1 bar, and a turbine-inlet temperature of 950 C. The engine drives an electrical generator that produces 25 MWe with a generator efficiency of 90%. For the following systems find the thermal efficiency, the specific work[kJ/kg], and the air mass flow rate [kg/s], if the compressor and turbine efficiencies are 80%. Assume the air is an ideal gas with constant specific heats. Its specific heat ratio is 1.4 and gas constant is 0.287 kJ/kg-K. a) A regenerative Brayton cycle with a regenerator effectiveness of 80%. b) Cycle of part (a) with intercooling to 20 C.
a 6.5m tall tank has a rectangular cross?section and is filled with water to a depth of 3.5m. assuming the pressure on
an automobile tire with a volume of 0.5m3 is inflated to a gage pressure of 200 kpa. calculate the mass of air in the
a 10-lb block is attached to an unstretched spring of constant k12lbin. the coefficients of static and kinetic friction
the volume of a cylinder is to be determined from measurements of the diameter and length. if the length and diameter
As the hollow steel (G = 77 GPa) shaft shown rotates at 180 rpm, a stroboscopic measurement indicates that the angle of twist of the shaft is 3°. Determine
a uniform rectangular cabinet having dimensions shown and mass m=50kg is placed onto a cart of mass 10 kg as shown. no slipping between cabinet and cart. determine the maximum allowable force P so that the cabinet does not tip.
Find the transfer function for the following impulse response
rope AB an AC are thrown to a boater whose canoe has capsized.Given that the angle is 25 and the magnitude of the force FR exerted by the river on the boater is 70N determine the tension in rope AB , in rope AC.
a bank uses a certain form at a uniform rate of 60 pads per week during each of the 52 weeks per year it is in
Treat the locomotive as a particle and assume that the railroad tracks are rectilinear and horizontal.
Consider a 70-kg woman who has a total foot imprint area of 400 cm2. She wishes to walk on the snow, but the snow cannot withstand pressures greater than 0.5 kPa. Determine the minimum size of the snow shoes needed.
Determine the magnitude of tensile force and corresponding normal stress of a wire A 28-ft length of 0.25-in
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