Category Archives: electrical-Laws & Theories

Sinusoidal Voltage Equation

A sinusoidal voltage can be described by the equation: v(t) = VM sin (ωt + Φ) or v(t) = VM cos (ωt + Φ) where v(t) Instantaneous value of the voltage, in volts (V). VM Maximum or peak value of the voltage, in volts (V) T Period: The time taken for one cycle, in seconds… Read More »

Octal Number System | Octal to Decimal Binary & Hexadecimal Conversion

The Octal Number System is another type of computer and digital base number system. Octal Number System is very similar in principle to the previous hexadecimal numbering system except that in Octal, a binary number is divided up into groups of only 3 bits, with each group or set of bits having a distinct value… Read More »

Circuit Breaker Types by Interrupting Medium Class

On this page you can find information about the circuit breaker types or classification by the interrupting medium used i.e. oil, air, vacuum or gas etc. Oil Circuit Breakers Oil has an excellent dielectric strength which enables itself not only to be used as an interrupting medium but also as insulation within the live parts.… Read More »

MCQ Multiple Choice Questions Transmission Lines Communications Engineering

Below you can find MCQ’s or Multiple Choice Questions related to the Transmission Lines in the field of Communications Engineering. Correct answers are in red & bold font. 1. What determines the velocity factor in transmission line? a) The termination impedance b) The center conductor resistivity c) Dielectrics in the line d) The termination impedance… Read More »

Electrical Engineering Interview Questions and Answers

Section 1: Electrical interview questions and answers about switchgear and protection What are the functions of protective relays? To detect the fault and initiate the operation of the circuit breaker to isolate the defective element from the rest of the system, thereby protecting the system from damages consequent to the fault. Give the consequences of… Read More »

Hall Effect & Hall Sensor

The Hall effect was discovered 18 years before the discovery of electrons i.e. in 1879 by Edwin Herbert Hall. This achievement happened when he was working on his doctoral degree at the Johns Hopkins University in Baltimore, Maryland, USA. What is Hall Effect The Hall effect is the production of a voltage difference (the Hall… Read More »