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A rectangular casting having the dimensions 3 inch by 5 inch by 10inch solidifies completely in 11.5min. Using n=2 in 2 inChvorinov's rule, calculate the mold constant B. Then compute the solidification time of a 0.5inch by 8inch by 8inch castingpoured under the same conditions?
An internally reversible heat engine has a thermal efficiency of 60 percent, with 600 kJ/cycle of heat transfer added at a temperature of 447 C. Calculate the heat-rejection temperature, in degrees Celsius, and the heat transfer rejected, in kJ/cycle..
steam turbine expands steam reversibly and adiabatically from 4Mpa,300C to 50C turbine exit. determine the work per kg of steam.
in an ammonia refrigeration plant 2 kgmin of ammonia enters the compressor at 1.902 bar and 0.96 dry and is compressed
Determine the magnitude and direction of the resultant force for the coplanar force system shown in Figure.
a circular cylinder of tantalum with an initial diameter of 3.1 mm is fired at a target. during impact the base of the
boxes are sitting on a conveyor belt as the conveyor is turned on moving the boxes toward the right. the belt reaches
An adiabatic heat exchanger is used to heat cold water at 8°C entering at a rate of 3 kg/s by hot air at 150°C entering also at rate of 3 kg/s. If the exit temperature of hot air is 30°C, what is the exit temperature of cold water? Use constant speci..
five kg of water is contained in a piston-cylinder assembly initially at 5 bar and 240degc. the water is slowly heated
A regenerative steam power cycle has a closed feed water heater that heats 20 kg/s of water from 100°C, 20 MPa to 250°C, 20 MPa. The extraction steam from the turbine enters the heater at 4 MPa, 275°C, and leaves as saturated liquid. What is the req..
A piston cylinder contains 1 kg of R-134a and undergoes a reversible compression process. During the process the R-134a also loses 37 kJ of heat to the environment. If the temperature of the piston remains a constant 20 oC and the initial the pressur..
Four kilograms of water, initially a saturated vapor at 75 kPa, are cooled to saturated liquid while the pressure is maintained constant. Determine the work and the heat transfer for the process, each in kJ. Show that the heat transfer equals the cha..
The transfer function between the elevator input and the pitch attitude of a plane is given by: Design an autopilot controller (using a lead compensator) for the system so that the response to a step input (pitch command) has a rise time of 1sec or l..
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