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Steam enters a long pipe as a saturated vapor at a pressure of 2 MPa. Due to heat loss from the pipe to the surroundings, the steam exits the pipe as a liquid- vapor mixture, also at a pressure of 2
Determine the maximum reversible COP and the theoretical minimum fuel energy input required to provide a 5 kJ/s cooling effect.
The low-temperature reservoir of a Carnot heat engine is at 10 C. To increase the efficiency of this heat engine from 40% to 55%, by how many degrees must the temperature of the high-temperature re
Consider a steam power plant that operates between the pressure limits of 10 MPa and 20 kPa. Steam enters the pump as saturated liquid and leaves the turbine as saturated vapor. Determine the ratio
Determine the cooling capacity of the device and the actual COP of the combined-cycle package = useful effect/expensive input.
During a gust of wind, the blades of the windmill are given an angular acceleration of = (0.2 ) rad/s2, where is measured in radians. If initially the blades have an angular velocity of 5 rad/s, det
Air flows at 120°C in a thin-wall stainless-steel tube with h = 65 W/m2 · °C. The inside diameter of the tube is 2.5 cm and the wall thickness is 0.4 mm. k = 18 W/ m · °C f
Write a function that accepts an array a as input, and searches the contents of the array for elements in three different ranges: [0 - 10), [10 - 50) and [50 - 100].
An insulation system is to be selected for a furnace wall at l000°C using first a layer of mineral wool blocks followed by fiberglass boards. The outside of the insulation is exposed to an envir
When the spring is loaded vertically with 1 kg weight, it is extended by 30 cm. When the weight is removed, it comes back to its original shape. Find Young's modulus (E) of the material. Assume Pois
A pro golfer can hit a ball at V=240 ft/s and ? = 9000 RPM. To model these conditions in a wind tunnel which has a maximum speed of 80 ft/s, what diameter model must be used? How fast must the model
A piston-cylinder assembly contains 2 lb of water, initially at 300°F. Determine the work and heat transfer for each of the two processes, all in Btu.
The pressure in a steam main is 12 bars. A sample of steam is drawn off and passed through a throttling calorimeter, the pressure and temperature at exit from the calometer being 1 bar and 140 degre
Suppose you have a choice between a straight triangular or rectangular fin constructed of aluminum with a base thickness of 3.0 mm. The convection coefficient is 50 W/m2 · °C. Select the
Find the standard normal curve area that lies: (a) between z = -0.77 and z = 0.77; (b) to the right of z = -1.39. Find the standard normal curve area that lies (a) to the left of z = 0.27
Calculate the rate of heat transfer per unit surface area by radiation between two brick walls a short distance a part when the temperature of the surface are 30 degree Celsius and 15 degree Celsius
A four cylinder four stroke diesel engine has a bore of 212 mm and a stroke of 292 mm. At full load at 720 rev/min the bmep is 5.93 bar and the specific fuel consumption is 0.226 kg/kW h.
Determine the reactions at pin locations A, B, and C (as scalar components with a unit of kN for a force and kN-m for a moment).
Air at 40 degree Celsius enters a mixing chamber at a rate of 225 kg/s where it mixes with air at 15 degree Celsius entering at a rate of 540 kg/s.
What is the minimum required length of the rod so that one end of the rod can be twisted 30 degrees with respect to the other end without exceeding the allowable stress?
The temperature in a vessel is 36 degree Celsius and the proportion by mass of air to dry saturated steam is 0.1. What is the pressure in the vessel in bar and in mm of mercury vacuum? The barometr
Find the amount of each cash flow in an equal quarterly cash folw series that equivalent to the increasing cash flow series. The interest rate is 14% and compounding is done quartely.
A piston cylinder containing Ar at some initial temperature(To), is allowed to cool. How much heat [Q] nad work [W] is lost to the surroundings if Vo = 0.15 m^3 and T1 = 650 K. Assume constant specifi
Following the process after having obtained answers for (b) the dividing medium is now allowed to move and the insulation is again replaced, preventing heat transfer. What are the final pressures an
Assuming you have a thermometer and a device to measure the speed of sound in a gas, explain how you can determine the mole fraction of helium in a mixture of helium gas and air.