Transformers Questions & Answers
Transformer Phasor Diagram
0%
In a single phase transformer,the noload current lags the applied voltage by
Correct!
Wrong!

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

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

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.
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.
Correct!
Wrong!

In an oil filled transformer, the application of oil is for
Correct!
Wrong!

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
Correct!
Wrong!

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

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

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

The non linear magnetization curve of a practical transformer will introduce
Correct!
Wrong!

Transformer action requires a
Correct!
Wrong!

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
Correct!
Wrong!

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

We laminate transformer core to reduce
Correct!
Wrong!

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
A small recognizable gap is made in the yoke of the limbs. With this altercation, the transformer core flux
Correct!
Wrong!

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