FE Electrical and Computer

What is Joule's law of energy? - answer-This law states that one energy form can be converted into another without loss. In physics, how is power defined? - answer-This is the amount of work done per unit time. P= dW/dt What are the units of magnetic flux density? - answer-tesla (T) or webers per meter squared (Wb/m2) What is the unit for a solid angle? - answer-steradian (sr) What is the unit for magnetic flux? - answer-weber (Wb) What is the unit for luminous flux? - answer-lumen (lm) What is the unit for illuminance? - answer-lux (lx) What is the mathematical expression for Ohm's law? - answer-V = IR What term describes an element in a specific location that represents distributed properties? - answer-lumped-parameter element What term describes an element that is not a source of energy (such as a resistor, inductor, or capacitor)? - answer-passive element What term describes a circuit that has the same current throughout all its elements? - answer-series circuit What term describes a circuit that has the same voltage across all its elements? - answer-parallel circuit What are the properties of a short circuit? - answer-zero voltage infinite (excessive) current zero resistance What are the properties of an open circuit? - answer-arbitrary voltage zero current infinite (large) resistance What is the mathematical expression for Joule's law of heating effect? - answer-P = (I^2)R What is the mathematical expression for Ohm's law? - answer-V = IR What term describes the open-circuit voltage, V(open circuit), at the terminals of interest? - answer-Thevenin equivalent voltage What is the formula for Thevenin or Norton equivalent resistance? - answer-V(open circuit)/I(short circuit) What term describes a node connecting three or more circuit elements? - answer-principal node What term describes the outflow of electrons into a vacuum from a heated conductor? - answer-photoelectric effect At any given instant, the sum of the instantaneous values of all the currents flowing toward a point is equal to the sum of the instantaneous values of all the currents flowing away from the point - answer-Kirchhoff's current law (KCL) What is the polar form of Vm sin (ωt + θ)? - answer-Vm ∠ θ What is the equation for the complex frequency variable? - answer-s = σ + jω What is the formula for capacitive reactance, XC? - answer--1/ ωC What is the formula for inductive reactance, XL? - answer-ωL In a three-phase system, the voltages are separated by - answer-120° In a three-phase system, when the loads are perfectly balanced, the neutral current is - answer-zero In a -connected source driving a -connected load, the - answer-load voltage, line voltage, and source phase voltage are all equal for a given phase In a -connected source feeding a Y-connected load, - answer-each phase voltage equals the difference of the corresponding load voltages In a Y-Y source/load configuration, the - answer-phase current, the line current, and the load current are all equal in each phase In a Y-connected circuit, the magnitude of each line current is - answer-equal to the corresponding phase current A constant load power means a uniform conversion of - answer-electrical to mechanical energy What is the equation for the impedance of a capacitor? - answer-1/jωC = -j/ωC What is the formula for the impedance of an inductor? - answer-jωL What is the impedance angle of an inductor? - answer-+90° What is the impedance angle of a capacitor? - answer-−90° What is the power triangle equation? - answer-S^2 = P^2 + Q^2 What is the mathematical expression for the average value of a rectified voltage sinusoid? - answer-(2/π)Vm What circuit element has a positive phase-angle difference? - answer-A capacitor has this type of phase-angle difference. What circuit element has a negative phase-angle difference? - answer-An inductor has this type of phase-angle difference. What is the value of s for a sinusoidal steady-state waveform? - answer-This is the type of waveform that results when s = jω. What is the value of s for an exponential waveform? - answer-This is the type of waveform that results when s = σ. What is the value of s for a damped sinusoid? - answer-This is the type of sinusoid that results when s = σ + jω. What is the value of s for a DC waveform? - answer-This is the type of waveform that results when s = 0 What is the formula for the impedance of a capacitor in the s-domain? - answer-1/sC What is the formula for the impedance of an inductor in the s-domain? - answer-sL What is the full name of the professional society whose acronym is ASME? - answer-The American Society of Mechanical Engineers What is the full name of the code that has the acronym NESC? - answer-The National Electrical Safety Code What organization gives certification in reliability engineering? - answer-Certification in this is given by the American Society for Quality (ASQ).