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A person wishes to build a WS (diversion-type) small hydroelectric system on his property. To measure the speed of the water, he dropped a ping-pong ball in the river and found the ball to travel 10m in 4s. He also selected a turbine with a sweep diameter of 0.8m. Assume that the coefficient of performance is 30%, the turbine efficiency is 90% and the efficiency of the generator is 96%. Compute the output power of the plant and the energy generated in 1 year. If the price of the energy sold to the neighboring utility is $0.06/kWh, compute the annual income from this small hydroelectric plant.
Calculate the percentage of electricity generation by these fuel-cell systems compared to the annual electricity generation in the U.S. of 3.8x109 MW-hrs
A sinusoidal message signal has a frequency of 10 Hz. The signal is the input to an FM modulator with an index of 8. Determine the bandwidth of the modulator output if a power ratio, Pr = 0.8 is required.
Three positive point charges, each with q = 3 nC, are located at the corners of a triangle in the x-y plane, with one corner at the origin, another at (2 cm, 0, 0), and the third at (0, 2 cm, 0). Find the electric field, E', at the origin.
A coil of 5000 turns is wound in the form of an air-cored torus with a square cross section. The inner diameter of the torus is 60 mm and the outer diameter is 100 mm. The coil current is 0.25 A.
Systems that operate under real time conditions need to be causal - that is, they can only process present and past inputs. When no real time processing is needed the system can be non-causal.
What are two of the major considerations that factor in the design of a substation. Give a couple of examples of station layouts where these factors are clearly demonstrated. What typical grounding materials are used in substations.
Technician B says that some engine computers use sensors to determine EGR flow rates, while others assume EGR flow rates by using estimates of EGR flow that are stored in a computer memory. Who is correct?
Problem: Consider the waveform x(t) shown below. The above signal x(t) consists of a DC component plus a sinusoidal signal. (The terminology DC component means a component that is constant versus time.)
Point charge above a conducting plane. A 5 nC point charge lies 2 m above a conducting plane. Find the surface charge density:
A 440v 4-pole dc generator takes an armature current of 50A when rotating at 626 rpm. the armature circuit resistance is 0.25 ohms. determine the generated emf?
Consider a communications channel with a passband of 3 kHz to 27.4 kHz. A modem will be connected to this communications channel and the modem will operate with a signaling rate that is 0.56 the maximum allowable signaling rate for this communicat..
A 20 vrms, 60 hz ac source is in series with an ideal diode and a 100 ohm resistance. Determine the peak current and peak inverse voltage (PIV) for the diode
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