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Determine the maximum cyclic stress that can be applied on the shaft if the shaft should have a life of 200,000 cycles. Is the endurance limit equal to half the ultimate strength in this case?
The water enters the electric heater at 60F and is heated to 150F. For a flow rate of 2 gal/min, determine required power rating of the heater in watts.
Expands adiabatically to 40 bar, 235 K with no significant changes in kinetic or potential energy. Determine the work developed in KJ per kg of argon flowing through the turbine.
Develop expressions for the specific enthalpy, internal energy, and entropy changes [h(v2,T)-h(v1,T)],[u(v2,T)-u(v1,T)],[s(v2,T)-s[v1,T)] using the van der Waals equation of state.
What would be the exit temperature take into account the change in inside heat transfer resistance due to the flow rate change?
How long will it take for the austenite to pearlite reaction to go to 50% completion? To 100% completion? Estimate the hardness of the alloy that has completely transformed to pearlite.
Calculate the number of Schottky defects per cubic meter for sodium chloride at 700 C. Assume an energy for defect formation of 2.3 eV and a material density at that temperature of 2.12 g / cm3.
Determine the normal stress on a plane inclined at an angle theta to the principal plane 1. Hence find the range of values of theta for which the normal stress is tensile.
Determine the maximum thermal eficiency of the power plant. Is is misleading to use the termperature given to calculate this value?
Assume the regriderator works in a carnot cycle between -10 and 45 degrees celsius. with a motor compressor of 500W. How much time does it take if this is the only cooling load.
Explain the difference between the magnitudes of rate of entropy generation within the turbine and for the turbine plus its surroundings.
Temperature deratings in addition to the options you specified on the engine, the deratings should be around 22.5%. Calculate the derated BSFC for the engine due to the deratings.
Convert the value above to a gallons per hour figure if diesel fuel is 7.076 lbs per gallon. Calculate the number of gallons you will use in a typical year for the engine.
Write a computer program or use an equation solver such as Mathcad or TK Solver to calculate and plot the s v a j diagrams for a modified trapezoidal acceleration cam function.
The mass flow rate is 11.9 kg/s. Neglecting potential energy effects, determine the power developed by the turbine, in kW.
Air at 5 bar and 177?C (State 1) is expanded through a turbine to 1 bar and 27oC (State2). Find the total rate of entropy generation (kW/K) for turbine and its surroundings.
Calculate the specific work (Btu/Ibm) for the compressor. Determine the specific heat transfer (Btu/Ibm) for the compressor. Show the compression process on P-v and T-s diagrams.
Determine the entropy generation (kJ/kg-K) for the compressor. Comment on the relative magnitudes of the specific work and entropy generation for the pump and the compressor.
This cycle is operated at 80 kPa and 20oC at the beginning of the compression step. Assume constant properties evaluated at 300 K. Determine the following the maximum pressure of the cycle.
What is the difference between steady state and non steady state diffusion procces? Use mathematical expresions for the steady state diffusion derive the expression for the non-steady state case.
Small room, where the air movement is minimal, what is the maximum heat flux that is permissible through the insulation and side steel?
What diameter of pipe should use for fully developed laminar flow and a pressure of 1 psi at the exit of the pipe, 300 ft. away?
A steel radiant tube, that is 8 inches in diameter and 8 feet long, is placed inside of a convective oven. What will be the surface temperature of the tube and the temperature of the air after passing
Consider hydrogen to be ideal gas with constant specific heats. Calculate the minimum possible inlet pressure (bar) of hydrogen gas
Air is compressed in a steady-flow compressor via a polytropic process from 15 psia and 60 degrees F (state 1). What do the areas under the process curve on the P-v and T-s diagrams represent?