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Speed control of motors (ac motors as well as dc motors) can be accomplished by using solid-state switching circuitry. In one such method, a solid-state relay is activated using a switching signal generated by a microcomputer so as to turn on and turn off the power into the motor drive circuit at high speed. The speed of the motor can be measured using a sensor such as a tachometer or optical encoder. This signal is read by the microcomputer and is used to modify the switching signal so as to correct the motor speed. Using a schematic diagram, describe the hardware needed to implement this control scheme. Explain the operation of the control system.
Electric power is generated by installing a high powered turbine-generator at a site 120 m below the free surface of a large water reservoir. Determine the power generation potential if the water can be steadily supplied at 2.4 m^3/s. Assume a densit..
consider a combined gass steam power plant that has a net power output of 450 mw. the pressue ratio of the gas turbine
a 32000 kg airplane begins to climb at an angle of 3 degrees. its initial speed is 150 ms and after one minute its
A pitot-static tube is inserted in a pipe carrying water at 10°C. A differential manometer using mercury as the gage fluid shows a deflection of 106 mm. Calculate the velocity of flow.
generate a script to draw the perpendicular bisector of any two points using ginput command. the length of the
Find the molar specific heat at constant volume of the mixture, in terms of the molar specific heats and quantities of the three separate gases.
a compressor is used to bring saturated water vapor at 150 lbfin2 up to 2500 lbfin2 where the actual exit temperature
solid carbon reacts with steam to produce carbon monoxide and hydrogen. given an hc atom ratio of 11 and an oc atom
Calculating temperature, water evaporation, and heat in a power plant cooling situation. In a nuclear power plant the cooling tower system must be run on a closed cycle.
The conditions in an office in summer are 75 F DB and 50% RH. Should the conditions remain as they are or should they be changed? Explain. What changes should be made, if any? Explain.
a spherical bowling ball of mass m 7 kg and radius r 0.2m is projected along a horizontal bowling alley surface mu
one pound-mass of air at 10 psia 70 of is contained in a piston-cylinder device. the air is now reversibly compressed
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