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A long trapezoidal bar is subjected to uniform temperatures on two surfaces, while the remaining surfaces are well insulated. If the thermal conductivity of the material is 20 W/m · K, estimate the heat transfer rate per unit length of the bar using a finite-difference method. Use the Gauss-Seidel method of solution with a space increment of 10 mm.
determine the current drawn from a 3 phase 220 V line by a 3 phase 15kW motor operating at half load, 85% efficiency and .8 pf lagging. Find the values of real and reactive power drawn from the line.
Consider a uniformly charged sphere of radius R1 with a spherical hole of radius R2 displaced a distance x0 from the center. Let ρ be the charge density. a) What is E on the x axis as a function of x
Suppose we have a resistive load that varies from 5 kOhms to 10 kOhms. We connect this load to an amplifier, and we need the voltage across the load to vary by less than 1 percent with variations in the load resistance.
A current source, Is =16.5cos(2300t) A, a resistor R=134Ω, and an inductor, L=0.12H are all in parallel. Assume steady-state conditions exist. At t=3.9ms, find the power being absorbed by the a.)resistor, b.)inductor, c.) sinsuoidal source
The 3phSM is used in a pumped storage application which has a head of 250 m. When pumping or generating, it operates at 84% efficiency, rated stator conditions. Determine the turbine flow when (1) generating and (2) pumping.
Draw the circuit and discuss the operation of SA type ADC. Determine the conversion time of an SA-ADC for 12-bit resolution,at 2.5 MHz.
A 480 V permanent magnet ac motor is consuming 10 kW at power factor 0.80 lagging. Its speed is 1800 rpm. The winding resistance is 0.5 ohms per phase. Core losses are 100 W.
Suppose a 15-uF capacitor is charged to 500 V. Determine the stored charge and energy. If this capacitor is discharged to 0 V in a time interval of 4 ?s, find the average power delivered by the capacitor during the discharge
A certain inverting amplifier has a closed-loop gain of 25. The op-amp has a open-loop gain of 100,000. If another op-amp with an open loop gain of 200,000 is substituted in the configuration, find the new closed-loop gain.
Calculate the built-in voltage of a junction in which the p and n regions are doped equally with 10^16 atoms/cm3. Assume ni =.5x10^10/cm^3. With the terminals left open, what is the width of the depletion region
A piece of n-type silicon is doped so that the majority carrier concentration is 10^15 cm^-3 What is the minority carrier concentration? (ni = 1.5 x 10^10 cm^-3) If a piece of silicon is doped with phosphorus to 10^17 cm^-3, what are the equilibrium ..
Load 1: Wye-connected load that consumes atotal 3-phase power of 3.6 kW at 0.8 power factor lag, when the generator voltage is set so that the voltage at the load is 480volts line-to-line. Load 2: Delta connected load that consumes 2kW+ j1 KVAR of..
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