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It is required to design the DC motor dedicated to carry two wagons underground railway train. Each wagon is supposed to carry a maximum of 20 persons. The power utility is supplying the railway by 700 V DC source capable to deliver enough current. The train should reach a full load speed of 100 Km per hour. The efficiency of the motor must be between 85 to 90 percent. The motor shaft diameter range is (0.6 to 0.8 m)Choose and estimate all the design characteristics of the motor finally display all the power flow diagram results including efficiency and speed regulation of the motor. Give all assumptions taken.
A compressor is employed to compress gas flowing steadily through it. The gas enters the compressor at a temperature of 16°C, a pressure of 100 kPa, and with an enthalpy of 391.2 kJ/kg. The gas leaves the compressor at a temperature of 245°C, a press..
a mixing chamber receives 3kgmin ammonia as saturated liquid at -20 c from one line and ammonia at 40 c 300 kpa from
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write a computer program that plots the contour lines of sigma1 sigma2 on a 2d rectangular beam. sigma represents the
Determine the surface temperature of the wire during a windy day when the air temperature is 10°C and the wind is blowing across the transmission line at 50 km/h.
a 137-cs source has an acticity of 700 mu ci. a gamma proton with energy 0.662 mev is emitted with a frequency of 0.849
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a rotating shaft is made of 42 mm od and 4-mm thick aisi 1018 cold-drawn steel tubing. it has has a 6-mm-diameter hole
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To compare the maximum temperature each surface reaches for a given input power when in free convection.
for each kw of power input to an ice maker at steady state determine the maximum rate that ice can be produced in kgs
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