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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 spring stiffness k= 500 n/m is mounted against a 10 kg block. if the block is subjected to a force of 1 KN determine the velocity of the block at s=0.3 m when s=0, the block is at rest and the spring is uncompressed. The coefficient of fricktion is..
according to test data a new type of engine takes in streams of water at 400 degrees f 40 psia and 200 degrees f 40
Consider a cold air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below.For k=1.4 Cv=0.718kJ/(kg*k), and Cp= 1.005 kJ/(kg*K)
two ideal gas with gas constant 0.287 kjkg.k flows are combined to a single flow in a mixing chamber. one flow is 1 m3s
The rolling resistance of a 1200kg car depends on its weigh as F = 0.006m x gravity. How far will the car roll if at 90km/h the gear is put in neutral on a level road without wind resistance?
a flywheel can be considered as being composed of this disk and a rim. the rim weighs 322lb and has a diameter of 24in
Air modeled as an ideal gas enters at 320k, 900kpa, with a velocity of 30 m/s and exits at 305k. Assuming steady state and neglecting stray heat transfer, determine for air exiting the pipe a) the velocity and b) the pressure.
Steam enters the turbine of a simple vapor power plant with a pressure of 10 MPa and temperature (T), and expands adiabatically to 6kPa. The isentropic turbine efficiency is 85%. Saturated liquid exits the condenser at 6 kPa and the isentropic pump e..
a circular shaft subjected to a repeated axial tensile load of 25kn. the shaft is made from aisl 4140 oqt 1100 steel.
a well insulated thin-walled double-pipe counter-flow heat exchanger is to be used to cool oil cp 2.20 kjkg c from 150
The center of gravity of the boom is located at G. Determine (a) the tension in cables DE and DF, (b) the reaction at A.
the uniform 11.1-kg square panel is suspended from point c by the two wires at a and b. if the wire at b suddenly
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