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When conducting an energy audit before sizing a renewable energy system, why should efficiency measures be considered before investment in energy generation?
A shipment of 100 items undergoes a selective inspection. 5 items are selected at random from the shipment and they are tested. What is the probability that the shipment will be rejected given that is contains 2% defective items
Discuss how the angle of the incident light affected the solar cell? How could solar cell designs and/or installations be designed to counter this affect?
A 65 kVA load with a lagging power factor is combined with a 25 kVA synchronous motor load which operates at pf = 0.60 leading. Find the power factor of the 65 kVA load, if the overall power factor is 0.85 lagging.
In a balanced three-phase wye-wye system, the load impedance is 10 +j1 Ohms. The source has phase sequence abc and the line voltage Vab = 220 Vrms /30°. The load voltage is VAN = 120 Vrms /0°.
Light traveling in air strikes a glass plate at an angle θ1 = 33 degrees, where θ1 is measured between the incoming ray and the glass surface. Upon striking the glass, part of the beam is reflected and part is refracted.
Suppose your multimeter is fused for 300 mA. You want to measure current through a resistor via a 9-volt battery. What is the minimum resistance such that the current is less than 150 mA
Two small plastic spheres are given positive electrical charges. When they are a distance of 15.6{\rm cm} apart, the repulsive force between them has a magnitude of 0.235{\rm N} .What is the charge on each sphere if the two charges are equal
(a) Find the matched-filter frequency response function H(f) for a perfectly rectangular (video) pulse of duration τ, andamplitude A. (Assume the pulse extends in time from -π/2 to+π/2). (b) Sketch (roughly) its magnitude abs {H(f)} for positive fr..
A certain sample of pure quartz has a dielectric constant of 3.8, dielectric strength of 1.0 kV/0.00010 in, and a density of 2.6 Mg/m3. a.)A field of 5.0 kV/cm is applied. Determine the polarization.
The band-limited continuous signal x(t) is sampled with impulse train p(t) with sampling period of T seconds. The output of the sampling circuitry is converted to sequence and is passed through a discrete time system with input of yin[n]
If a silicon diffusion is doped with phosphorus (donors) at a concentration of 0.6 x 10^17/cm^3, what is the concentration of holes in this piece of silicon per cm^3 Assume ni = 1.45 x 10^10/cm^3, n = 1000 cm^2/V-s, p = 400 cm^2/V-s
discharge a capacitor of 1mF charged with a voltage of 1 volt we connect it, at time t = 0, with a esistor of R ohm. When we measure the voltage we find it to be V(r) (t) = e ^(-t) u(t). Determine the resistance of R. If the capacitor has a capaci..
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