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1. A quenched and tempered 10110 steel is found to have surface cracks that cause the heattreated part to be rejected by the customer. Why did the cracks form? Design a heat treatment, including appropriate temperatures and times that will minimize these problems.
2. Design a corrosion-resistant steel to use for a pump that transports liquid helium (He) at 4 K in a superconducting magnet.
air an ideal gas is isentropically compressed from v1 0.36 ft3 p1 14.5 psia t1 70degf to v2 0.03 ft3compression
A Carnot heat pump is to be used for heating house in winter. The house temperature is set at 25oC. One day the outdoor temperature is 2oC. The house is estimated to lose heat at a rate 55000kJ/h (which equal to Qout of the heat pump).
determine the radial acceleration of a point on the outer surface of the 36 inch diameter tires of a jet-powered car
carbon dioxide flows through a device entering at 300 k 200 kpa and leaving at 500 k. the process is steady state
A thin walled tube with closed ends has an inside radius of 80mm and a wall thickness of 6 mm. It is subjected to an internal pressure of 20 MPa, a torque of 60 kN*m, and an axial compressive force of 200 kN. Determine the maximum normal stress and t..
An electrically-driven pump operating at steady state draws water from a pond at a pressure of 1 bar and a rate of 40 kg/s and delivers the water at a pressure of 4 bar. Evaluating electricity at 8 percents per kW/h estimate the hourly cost of runnin..
a steam turbine is limited to a maximum inlet temperature of 800degc. the exhaust pressure is 0.0100 mpa and the
the wall of a heat exchanger receives a variable heat flux as shown in the figure. the heat flux is q dot of second
an ideal brayton cycle has reheat between the first and second staged turbines and regeneration following the second
Water in a cylindrical container is hanging by a rod from the ceiling at point O shown in the figure. The container is initially full, and initially displaced 20 degree . There is a hole in the bottom where water pours out and the top of the containe..
a steel cylinder initially contains nitrogen gas at 200 kpa and 25 degree at celsius. the cylinder is in is connected
In a regenerative steam employing three closed feed heaters the steam is supplied to the turbine at 42 bar and 503 tt and is exhausted to the condenser at 0.035 bar.
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