## Efficiency Of A Transformer

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

## Significance Of Back E.M.F. In Dc Motor

It is seen in the generation action, that when a conductor cuts the lines of flux, e.m.f. gets induced in the conductor.…

## Open Circuit Test Or No-Load Test

Figure 1.35 Open Circuit Test From this test, we can determine core loss and no-load current (I0) of the transformer. Figure 1.35 shows…

## All-Day Efficiency

The ratio of output in watts to input in watts is called commercial efficiency of a transformer. Distribution transformers are used for supplying lighting…

## Separation Of Core (Or Iron) Losses In A Transformer

Hysteresis loss and eddy current loss are the components of the iron losses. For the applied fl ux density Bmax to the core, we…

## Short Circuit Or Impedance Test

The main purpose of this test is to compute the following: Equivalent impedance of the transformer referred to primary and secondary. Cu…

## Power Equation Of A D.C. Motor

The voltage equation of a d.c. motor is given by, V = Eb + Ia Ra Multiplying both sides of the above equation by…

## Total Approximate Voltage Drop Of A Transformer

During no-load condition, induced voltages at the primary and secondary windings are equal to the applied voltage and secondary terminal voltage respectively.…

## Transformer With Resistance And Leakage Reactance

Figure 1.30 shows a transformer having resistances R1 and R2 of primary and secondary windings respectively, and leakage reactances X1 and X2 of primary and secondary windings respectively. The primary…

## Effect Of The Armature Reaction On Performance Of A D.C. Motor

The armature reaction is nothing but the effect of flux produced by armature conductors on the distribution of main flux due to…