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A man owns a land that includes a low head water fall and wants to build a small hydroelectric plant. The effective head of the reservoir is 20 m. He used a tube of 3 m length and 1 m diameter as a penstock. He computed the speed of the water inside the penstock by dropping a small ball at the entrance of the tube and measuring the time it took to reach the other end of the tube. The ball traveled the penstock in 2 s.
a. Compute the power at the outtake of the tube.
b. If the coefficient of performance of the turbine is 0.95, and the efficiency of the generator turbine and generator is 90%, compute the expected generation of the site.
c. If the cost of building the small hydroelectric system is $10 M, compute the payback period if the cost of electricity from the neighboring utilities is $0.2/kWh. Assume that the water flow is always constant.
d. Is building this small hydroelectric system a good investment?
A gold wire (resistivity of 2.44× 10(-8) Ω·m and a temperature coefficient of 3.4×10(-3) °C-1) with a radius of 0.100 mm has a uniform electric field of 2.50 V/m imposed along its entire length. The temperature of the wire is 50.0°C.
The friction and windage loss is 20W, the coreloss is 35W, and the field-winding loss is 30W. Determine the power angle and the efficiency of the motor when it delivers the ratedpower at a unity power factor.
The voltage drops across three resistors in series are measured to be 10.0V, 15.0V, and 25.0V. If the largest resistor is 47.0ohm, what is the value of the smallest resistor
Once a week a wagon driver leaves his hut and drives his wagon to the river dock to pick up supplies for his town. At 4:05 PM, one-fifth of the way to the dock, he passes the Temple. At 4:15 PM, one-third of the way, he passes the Preetam-Da-Dhaba..
Let X be a zero-mean random variable having a variance of 9 and let Y be another zero-mean random variable. The sum of X and Y has a variance of 29 and the difference of X and Y has a variance of 21.
A zener regulator circuit has a load resistance that varies between 470 ohms and 2700 ohms. The circuit uses a 10V zener diode, Rs = 330 ohms, and the source voltage is 24V. The zener resistance is 10 ohms and the zener test current (Izm) is 28mA.
A two stage counter has two input, M and N. (a) Design a counter assuming the outputs come directly from J-K flipflops. (b) Design the counter assuming a two-stage binary counter is used with the J-K flipflops outputs decoded.
Given an 8kx8 device, you need to create an entire memory system of64Kx16. How do you create it using the 8Kx8 devices and what are the address lines of the 8k and entire system
An AM signal is written as xc(t) = Ac (1+ µx(t))cos(2pi*fc*t) where fc is the carrier frequency, Ac is the carrier amplitude, µ is the modulation index, and x(t) is the baseband message signal. We assume that x(t) has absolute bandwidth W
Write a checker always block for inclusion in the testbench using the revised memory bus functional model of Exercise 9.10. The checker should verify that derivative pixels written to memory by the Sobel accelerator have the values determined in E..
The major principle stress at failure for a triaxial compression test on dense sand was 5.15 tsf.the minor principal stress ,or lateral pressure, was 1.45 tsf. plotthe mohr circle at failure and, assuming the sand to be cohesionless, determine the..
Assuming that the current through and inductor is i l(t) = 10exp(-t/3). Find at what time this current dropped by 50percent of its initial value.
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