## LOSSES IN A TRANSFORMER

Two types of losses occur in a transformer: Core loss or iron loss occurs in a transformer because it is subjected to…

## Kapp’s Regulation

Kapp had designed a diagram shown in Figure 1.42 to determine the regulation at any power factor. The description of the construction…

## SYNCHRONOUS MOTOR Interview Questions With Answer

1. State the characteristic features of synchronous motor. Ans: a. the motor is not inherently self starting b. The speed of operation…

## Hunting in Synchronous Motor

It is seen that, when synchronous motor is on no load, the stator and rotor pole axes almost coincide with each other.…

## Expression for Back E.M.F or Induced E.M.F. per Phase in S.M.

Case i) Under excitation, Ebph < Vph . Zs = Ra + j Xs = | Zs | ?? ? …

## EFFICIENCY OF A TRANSFORMER

Due to the losses in a transformer, its output power is less than the input power. ∴ Power output = Power input…

## Condition for Maximum Power Developed In Synchronous Motor

The value of ? for which the mechanical power developed is maximum can be obtained as, Note : Thus when Ra is…

## CALCULATION FOR VOLTAGE REGULATION

The voltage regulation up is expressed mathematically by Positive sign is for lagging power factor and negative sign is for leading power…

## Blondel Diagram ( Constant Power Circle) in Synchronous Motor

The Blondel diagram of a synchronous motor is an extension of a simple phasor diagram of a synchronous motor. For a…

## Alternative Expression for Power Developed by a Synchronous Motor

Consider the phasor diagram of a synchronous motor running on leading power factor cos? as shown in the Fig. 1. Fig. 1…