Snubber circuits are used with thyristors in order to – Electrical Engineering MCQ

Snubber circuits are used with thyristors in order to: Correct answer: 2. Limit the rate of rise of voltage dv/dt More MCQs on Power Electronics Explanation: The dv/dt rating of thyristor implies the maximum rate of rise of anode voltage that will not trigger device without any gate signal. A snubber circuit is used in … Read more

The typical value of SCR for the modern alternators is around – Electrical Engineering MCQ

The typical value of SCR for modern alternator is around: Correct answer: 1. 0.5 Explanation: Short circuit ratio or SCR is defined as a measure of the stability of an electromechanical generator. Mathematically it is defined as the ratio of the field current required in order to generate rated voltage on an open circuit to … Read more

The Unijunction Transistor – UJT Basic Construction and Working

Unijunction transistor: Although a unijunction transistor is not a thyristor, this device can trigger larger thyristors with a pulse at base B1. A unijunction transistor is composed of a bar of N-type silicon having a P-type connection in the middle. See Figure below (a). The connections at the ends of the bar are known as bases B1 and B2; … Read more

DIAC Basic Construction and Working

Like all diodes, Shockley diodes are unidirectional devices; that is, these only conduct current in one direction. If bidirectional (AC) operation is desired, two Shockley diodes may be joined in parallel facing different directions to form a new kind of thyristor, the DIAC: (Figure below) A DIAC operated with a DC voltage across it behaves … Read more

Galvanic Isolation and 3 Types of Galvanic Isolators [With Advantages and Disadvantages]

3-types-of-galvanic-isolators

Galvanic isolation is the process of separating different sections of electrical circuits for stopping current flow while allowing the required amount of information to flow through these sections. Galvanic isolation is used in cases where two or more circuits having different ground should communicate with each other. Let’s discuss three types of Galvanic Isolation methods: … Read more