# Electrical Machine

## Potential Transformer MCQ || Voltage Transformer Questions and Answers

1. Potential transformers are used for measurement of _____voltages by means of _____ range voltmeters. High, Low Low, High High, High Low, Low   2. The Primary MMF is least affected by the secondary terminal condition in a Power Transformer Potential Transformer Current Transformer Distribution Transformer   3. What is the effect of increasing secondary …

## Distribution Factor MCQ – Objective Question with Answer for Distribution Factor

1. The Distribution Factor is also known as Power Factor Breath Factor Belt Factor Both 2 and 3   2. Distribution factor is defined as the ratio of Actual voltage to Possible voltage Possible Voltage to Actual Voltage Actual Power to Possible Power Possible Power to Actual Power   3. Calculate the distribution factor for …

## Why synchronous motor is not self starting

Why Synchronous Motor not Self Starting When a three-phase supply is given to the stator of a three-phase wound synchronous motor, a rotating field is set up in the air gap which rotates at synchronous speed (Ns = 120f/p). This is represented by the imaginary stator poles. The synchronous motor works on the principle of …

## Parallel Operations Of Alternator | Synchronous generator

PARALLEL OPERATION OF ALTERNATOR | SYNCHRONOUS GENERATOR When we speak about the parallel operation of alternators, the first question that arises is: what is the necessity of connecting a large number of alternators in parallel. The answer is very simple. To meet with the ever-increasing demand for electrical power, it is economical and advisable to …

## EMF Equation OF Transformer | Turn voltage ratio of Transformer

EMF Equation Of Transformer ⇒ Let us consider an ideal transformer on no load, when an alternating voltage V1 is applied to the primary side of the transformer thus magnetizing current start flowing in the primary winding and flux Φ is generated in the transformer core. ⇒ The flux Φ is uniformly distributed around the transformer core …

## Working principle of synchronous motor

Synchronous Motor Working Principle Electric Motor is an electromechanical device which transforms electric energy into mechanical energy. According to their type of connection, electric motors are generally classified into the two types i.e single phase motor and three phase motor. A synchronous motor is a 3 phase motor and it closely resembles 3 phase alternator. 3 …

## Speed Regulation Of DC Motor

Suppose Mohan and Ram go to school by cycle. One day Ram cycle get punctured so he asked Mohan for help. Now Mohan has to carry the extra weight of Ram. So obviously the extra weight will reduce the speed of Mohan’s cycle. Therefore he has to exert some extra power to reach in time. This extra power in …

## Working Principle of DC Motor

Working Principle of DC motor The DC motor work on the principle when the current-carrying conductor is placed in a magnetic field it experiences a mechanical force. The force is experienced from high flux density to low flux density. Magnitude of force experienced by the armature conductor is F = BIL NEWTON Where B = …

## Construction Of DC Generator

The principle of single loop DC generator has been described for the basic understanding of DC generator working. Now we will discuss the construction and working of actual generator. The construction of DC generator and DC motor is same therefore instead of DC generator let say DC machine which is more appropriate and cover all …

## Transformer

Basic of Transformer A transformer is a static device which converts the alternating current energy from one voltage level to another voltage level. Why is the Transformer a static device? Unlike motor or generator where motion is required to generate output, but in the case of transformer both the winding i.e primary winding and secondary …

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