Transformer Phasor Diagram

Transformer action requires a

A transformer has sometimes more than two ratings depending upon the use of

The output voltage seen at the CRO connected at the secondary terminals is square wave. Then the flux density used for energizing the primary is

Considering a transformer at no load is excited at rated voltage.
A small recognizable gap is made in the yoke of the limbs. With this altercation, the transformer core flux

In case of a power transformer, the no load current in terms of rated correct is

Energising the transformer primary from a triangular wave flux makes the output voltage as

I. Core flux – Depends on applied voltage
II. Leakage flux – Depends on winding current
Which of the above two are matched correctly?

We laminate transformer core to reduce

In an oil filled transformer, the application of oil is for

In a single phase transformer,the no-load current lags the applied voltage by

I. Voltages – Direct ratio
II. Current – Inverse ratio
III. Impedance – Direct ratio squared
Iv. Power – Inverse ratio squared
Mark the statements which are marked correct for an ideal transformer.

A 400/200V transformer has total resistance of 0.04 p.u on its L.V side. This resistance when referred to H.V side would be

In an ideal transformer, the impedance can be transformed from one side to the other

If a transformer is fed from a 220V and dc supply rather than a 1-phase ac supply, then the transformer will

The non linear magnetization curve of a practical transformer will introduce

Energizing the transformer primary from a triangular wave voltage source makes the output voltage as