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A pump is required to move water at 2900 gal/min against a head of 200 ft. The approximate rotational speed is 1400 rpm. Using the appropriate dimensionless performance curve in the text, determine the actual speed and size of the pump to operate at peak efficiency.
4H-SiC is doped with 2 x 1017 cm-3 nitrogen donor atoms (Ec - Ed = 90meV). Use Nc = 4 x 1020 cm-3. a. Calculate the electron density at 300 K. b. Calculate the hole density at 300K after adding 2 x 1018 cm-3 aluminum acceptor atoms
A superheterodyning FM receiver was originally designed and built to operate in the US only. The FM broadcasting band in the US is from 87.5 MHz to 108 MHz. The intermediate frequency of the receiver is fI = 10.7 MHz. This receiver has a poor RF B..
apply the MACDtrading strategy to the closing price of QQQQ for the period from February 1, 2005 through September 1, 2005. What is the netgain over the time period assuming that your first order must be abuy and your last order a sell
A continuous-time signal x(t)=tri((t-1)/2) is sampled at three rates: 10, 2, and 1 Hz. Sketch the resulting sampled signals. Because x(t) is timelimited, its bandwidth is infinite. However, most of its energy is concentrated in a small band.
When studying AC motors and DC motors, what is an exciter relative to an AC motor?
Let real periodic sequence x[n] have Fourier Series coefficients ak and sequence y[n] have coefficients bk. Both sequences are periodic with period N = 8. If bk=((-1)k+2ak-2 write an expression for y[n] in terms of x[n].
Two vertical forces are applied to a beam of the cross section shown. Determine the maximum tensile and compressive stresses in portion BC of the beam.
Recall the two presidential speeches that were given by both President Obama and President Reagan, respectively. Note that these two presidents used the Rogerian method of argumentation to not only win over those who agreed with their viewpoints, bu..
Design the desired truth table (inputs T1, T0, N, C) for the outputs U, Q and S. - Use a Karnaugh map to reduce the logical expressions for the functions U, Q and S to a minimal SOP form.
The coil area is 2.7 mm*mm, the number of turns is 187; it also has an iron core with permeability mu= 600. How long must the coil be to have an inductance of 8.3 mH
A digital output voltmeter has an input range of 0 to 30 V and displays three significant figures XX.X. The manufacturer claims an accuracy of ±2% of full scale. With a voltage reading of 5 V, what are the percent uncertainties of the reading due ..
The bar shown has a circular cross section of 14-mm diameter. Knowing that the allowable stress is 38 MPa, determine the largest permissible distance α from the line of action of the 220-N forces to the plane containing the center of curvature of ..
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