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If the isentropic efficiency of the turbines are 90%, please plot the T-S diagram and determine (a) thermal efficiency (b) mass flow rate of the steam entering the first turbine.
What maximum pressure will cause static yielding? What maximum pressure will cause fatigue failure assuming that the joint and connections are adequately reinforced and do not cause weakening of the
Calculate the thermal efficiency of the cycle (a) if processes in turbine and compressor are ideal and (b) if the isentropic efficiencies of the turbine and compressor are 0.75 and 0.65, respectivel
Calculate (a) the compression ratio, (b) the cut-off ratio, (c) the heat input per cycle, (d) the heat rejected per cycle, (e) the net work output per cycle and (f) the thermal efficiency of the cyc
The bottom slope is 0.0014. Determine the dimensions of the best cross section if the channel shape is rectangular of bottom width b
Estimate the production time for the generation of a 38 mm (1.5 in) solid cube. Assume that there is a 10-second delay between layers as the extruder head is moved over a wire brush for cleaning.
Determine the dimensions of the best cross section if the channel shape is (a) circular of diameter D, (b) rectangular of bottom width b, and (c) trapezoidal of bottom width b.
A diesel engine for marine propulsion application produces a maximum power of 900 hp and toque of 5300 N*m. Determine the engine speed necessary for this production in rpm.
The torque ratio of a gear set is 0.75. The pinion gear has 36 teeth and a diametral pitch of 8. Determine the number of teeth on the output gear and the radii of both gears.
A) Determine the horizontal velocity of the rack. B) If a peak torque of 10ft*lb is supplied by the motor, determine the pulling force that is produced in the rack and transferred to the milling mac
Calculate the electronic contribution to the thermal conductivity for Cu and n-type Si (1x1018 cm-3 doping, resistivity = 0.1 Ohm-cm) at 100ºC.
Make use of the Navier Stokes equation to determine the relationship between the discharge and the other parameters involved, for the case in which the change in pressure along the channel is zero.
Calculate (a) the highest temperature (K) and pressure (kPa) in the cycle, (b) the heat input (kJ), (c) the net work output (kJ), and (d) the thermal efficiency of the cycle.
Obtain an expression for work of the cycle in terms of mass, specific heat, T1, T3, k, and compression ratio. Assume constants m=.001kg, Cv=.8, k=1.4.
Draw the cycle on a T-s diagram and calculate (b) the specific heat added (kJ/kg) , (c) the specific heat rejected (kJ/kg), and (d) the thermal efficiency of the cycle.
Briefly describe the simplest heat treatment procedure that would be used in converting a 0.76 wt% C steel from one microstructure to the other, as follows: (a) Martensite to spheroidite.
The gas is compressed reversibly to a pressure of 800 kPa. Calculate the work required if the process is a) adiabatic, b) isothermal, c) polytropic with n=1.15
If all the heat transfer during the process is with the ambient at 10 degrees C, calculate the net entropy change for the process.
You should determine the velocity as a function of r, R. viscosity, and pressure gradient. Draw the velocity distribution and the shear stress distribution vs. r for this flow.
(a) At what point on the plate, the flow becomes turbulent? (b) Compute the average heat transfer coefficient for the flow (c) What is the convective heat transfer rate from the plate?
Find the heat transfer and work per unit mass of air in KJ/kg for each process of the two cycles, and compare the thermal efficiency of each. Assume constant specific heats at room temperature, and
Assuming an ideal gas, find P_2 using both the ideal gas tables and assuming a constant specific heat ratio at the average temperature.
Determine if this device is consuming or generating work? How much? Also determine the entropy change for the flowing air and comment on its value and sign.
The turbine is adiabatic, and kinetic and potential energy changes are negligible. If the isentropic turbine efficiency is 75%, determine the work per unit mass flow in KJ/kg, and plot on an h-s dia
A well-insulated heat exchanger is used to heat water (cp = 4.18 KJ/kg*K) from 300 K to 90°C with a mass flow rate of 3 kg/s. Determine the exit temperature of the oil, and the entropy generation