Symbol Counter: Symbol Counter - A counter is a simple device used for counting. There are different types of counters. There are up-counters (that only count up 1, 2, 3 ...). These are called CTU (Count…
What is Liquid Crystal Display (LCD)?: Liquid Crystal Display (LCD) are passive displays characterized by very low power consumption and good contrast ratio. They have the following characteristics in common. They are light scattering. They…
8251 Usart: We know that, 8251A is Universal Synchronous, Asynchronous, Receiver, and Transmitter. Therefore 8251 Usart can take place with four different ways. Asynchronous transmission Asynchronous reception Synchronous transmission Synchronous reception These communication modes can…
Classification of Power Amplifiers: Classification of Power Amplifiers are primarily divided into two categories viz. audio power amplifiers and radio power amplifiers. Audio power amplifiers, also called the small signal power amplifiers, raise the power…
Rotor Protection: Rotor Protection - As pointed earlier rotor windings may be damaged by earth faults or open circuits. Figure (6.16) shows a modern method of rotor earth-fault detection. The field is biased by a…
Foldback Current Limiting Circuit: The disadvantage of constant current limit is relatively large power dissipation in the series pass transistor when the load terminals are shorted. Thus a large power rating transistor is required. The…
Percentage Reactance in Power System: The Percentage Reactance in Power System of generators, transformers, reactors etc. is usually expressed in percentage reactance to permit rapid short circuit calculations. The percentage reactance of a circuit is…
Different Groups of Systems of Electric Traction: As already mentioned, systems of electric traction may be divided into two main groups. (1) The group consisting of vehicles which receive electric power from a distributing network…
Armature Control Method: The main requirement of this Armature Control Method scheme is a variable voltage supply to the armature whose current rating must be somewhat larger than that of the motor. It is superior…
Difference between Minimum Oil Circuit Breaker (MOCB) and Bulk Oil Circuit Breaker (BOCB): The difference between minimum oil circuit breaker (MOCB) and bulk oil circuit breaker (BOCB) is given in table below Sl no Minimum…