FE Electrical and Computer Exam 2024

What is Joule's law of energy? - Correct Answer-This law states that one energy form can be converted into another without loss. In physics, how is power defined? - Correct Answer-This is the amount of work done per unit time. P= dW/dt What are the units of magnetic flux density? - Correct Answer-tesla (T) or webers per meter squared (Wb/m2) What is the unit for a solid angle? - Correct Answer-steradian (sr) What is the unit for magnetic flux? - Correct Answer-weber (Wb) What is the unit for luminous flux? - Correct Answer-lumen (lm) What is the unit for illuminance? - Correct Answer-lux (lx) What is the mathematical expression for Ohm's law? - Correct Answer-V = IR What term describes an element in a specific location that represents distributed properties? - Correct Answer-lumped-parameter element What term describes an element that is not a source of energy (such as a resistor, inductor, or capacitor)? - Correct Answer-passive element What term describes a circuit that has the same current throughout all its elements? - Correct Answer-series circuit What term describes a circuit that has the same voltage across all its elements? - Correct Answer-parallel circuit What are the properties of a short circuit? - Correct Answer-zero voltage infinite (excessive) current zero resistance What are the properties of an open circuit? - Correct Answer-arbitrary voltage zero current infinite (large) resistance What is the mathematical expression for Joule's law of heating effect? - Correct Answer-P = (I^2)R What is the mathematical expression for Ohm's law? - Correct Answer-V = IR What term describes the open-circuit voltage, V(open circuit), at the terminals of interest? - Correct Answer-Thevenin equivalent voltage What is the formula for Thevenin or Norton equivalent resistance? - Correct Answer- V(open circuit)/I(short circuit) What term describes a node connecting three or more circuit elements? - Correct Answer-principal node What term describes the outflow of electrons into a vacuum from a heated conductor? - Correct 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 - Correct Answer-Kirchhoff's current law (KCL) What is the polar form of Vm sin (ωt + θ)? - Correct Answer-Vm ∠ θ What is the equation for the complex frequency variable? - Correct Answer-s = σ + jω What is the formula for capacitive reactance, XC? - Correct Answer--1/ ωC What is the formula for inductive reactance, XL? - Correct Answer-ωL In a three-phase system, the voltages are separated by - Correct Answer-120° In a three-phase system, when the loads are perfectly balanced, the neutral current is - Correct Answer-zero