Control of Traction Motors Interview Questions and Answers: 1. The resistors employed for control of traction motors are designed for short-time rating. Why ? Ans. Because control resistors are required only during starting of traction…
Difference Between Star and Delta Connections: Difference Between Star and Delta Connections - In star connection with earthed neutral, the maximum voltage of the phase winding to ground is 1/√3 or 58% of the line…
Modern Laboratory Signal Generator Block Diagram and its Working: Modern Laboratory Signal Generator - To improve the frequency stability, a single master oscillator is optimally designed for the highest frequency range and frequency dividers are…
Drift Current and Diffusion Current in Semiconductor: The two basic processes which cause electrons and holes to move in a semiconductor are : drift, which is the movement caused by electric fields, and diffusion, which…
Multicavity Klystron: The design of the multicavity klystron, together with all the remaining tubes described here, relies on the fact that transit time will sooner or later terminate the usefulness of any orthodox tube. They…
Least Square Estimation Method: As we are going to seen that, the problem of power system state estimation is a special case of the more general problem of estimation of a random vector x from…
What is Vacuum Diode, Construction, Working and Applications: Construction of Vacuum Diode - Vacuum diode is the simplest form of the electron tube for the production and control of free electrons. A typical vacuum diode…
Zero bias PN junction: Zero bias PN junction - Here we will examine the properties of the step junction in thermal equilibrium, where no currents exist and no external excitation is applied. We will determine…
AC Input: The, ac input modules that are commonly available work with 24, 48, 110 and 220 V. It is important to use the one that fits the needs based upon the inputs devices (voltage)…
Arc Lamp -Definition, Working Principle and Types: In an arc lamp electric current is made to flow through two electrodes in contact with each other which are drawn apart. The result is an arc being…
