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An engineer is designing a control system for a chemical process with reagent concentration as the sole control variable. After determining that the system is not controllable, why is it impossible for him to control all the modes of the system by an innovative control scheme using the same control variables? Explain, and suggest an alternative solution to the engineer's problem.
A mixture contains only NaCl and Fe(NO3)3. A 0.456-g sample of the mixture is dissolved in water, and an excess of NaOH is added, producing a precipitate of Fe(OH)3. The precipitate is filtered, dried, and weighed. Its mass is 0.107 g.
Why natural convection and radiation to the surroundings. Taking the body temperature 0.5 cmbeneath the skin to be 37°C, determine the skin temperature of the person.
How have the technological advances in personal computing made this conversion faster and the speech output more lifelike?
If the feed contains 0.2% argon (from the nitrogen separation process), calculate the purge rate required to hold the argon in the recycle stream below 5.0%. Percentages are by volume.
Ten kmol per hour of air is throttled from upstream conditions of 298.15 K (25°C) and 10 bar to a downstream pressure of 1.2 bar. Assume air to be an ideal gas with Cp = (7/2)R.
The circuit shown in Figure P3.4.19 is the equivalent circuit of a field-effect transistor (FET) amplifier stage.
Derive the Nernst potential for R+++ at equilibrium.
263Sg decays by emission. What is the other product resulting from the decay of 263Sg?
The speed of the rotor rotating magnetic field with respect to the stator rotating magnetic field in r/min.
A 50-kW, 250-V, short-shunt compound generator has the following data: Ra = 0.06 Ω, RS = 0.04 Ω, and Rf = 125 Ω. Calculate the induced armature voltage at rated load and terminal voltage. Take 2 V as the total brush-contact drop.
Develop this result. What is the corresponding bound for an equimolar mixture containing N species?
The heat-pump motor is rated, at 1.5 kW. Determine the minimum outside temperature for which the house can be maintained at 293.15 K (20°C) during the winter and the maximum outside temperature for which the house can be maintained at 298.15 K (25..
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