Transformers Questions & Answers
Ideal Two Winding Transformer
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I. Zero winding resistance
II. Constant permeability
III. Constant core losses
Iv. Zero leakage reactance
Which of the above assumptions about the transformer supports the fact that the instantaneous power input and output of a transformer is equal?
II. Constant permeability
III. Constant core losses
Iv. Zero leakage reactance
Which of the above assumptions about the transformer supports the fact that the instantaneous power input and output of a transformer is equal?
Correct!
Wrong!

Consider a 2winding transformer as below. If the switch is kept open then the emf
induced across the secondary having transformation ratio of ‘2’ is
induced across the secondary having transformation ratio of ‘2’ is
Correct!
Wrong!

I. Zero winding resistance
II. Constant permeability
III. Constant core losses
Which of the above statements support the ideal transformer features?
II. Constant permeability
III. Constant core losses
Which of the above statements support the ideal transformer features?
Correct!
Wrong!

I. Zero winding resistance
II. Zero leakage flux
III. Negligible core losses
Which of the above statements support the ideal transformer features?
II. Zero leakage flux
III. Negligible core losses
Which of the above statements support the ideal transformer features?
Correct!
Wrong!

I. Variable winding reactance
II. Constant permeability
III. Constant core losses
Which of the above statements support the ideal transformer features?
II. Constant permeability
III. Constant core losses
Which of the above statements support the ideal transformer features?
Correct!
Wrong!

Consider a 2winding transformer as below. If the switch is open then the emf induced across the load ‘Zl’ having transformation ratio of 2 is
Correct!
Wrong!

If it is happened to place an inductive load to a two winding transformer, then the phasor diagram for such a loading will be
Correct!
Wrong!

I. Core flux in an ideal transformer remains constant.
II. Core flux is independent of the load current.
The correct statements is/are
II. Core flux is independent of the load current.
The correct statements is/are
Correct!
Wrong!

I. Voltages – inverse ratio
II. Current – direct ratio
III. Impedance – direct ratio squared
Iv. Power – remains same
Mark the statements which are marked incorrect for an ideal transformer.
II. Current – direct ratio
III. Impedance – direct ratio squared
Iv. Power – remains same
Mark the statements which are marked incorrect for an ideal transformer.
Correct!
Wrong!

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

The voltage induced at the end of primary terminals of a two winding transformer consisting of N turns is
Correct!
Wrong!

Consider a 2winding transformer as below. If the switch is open then the emf induced across the secondary having transformation ratio of 2 is
Correct!
Wrong!

I. Zero winding resistance
II. Constant permeability
III. Constant core losses
Iv. Zero leakage reactance
Which of the above statements support the ideal transformer features?
II. Constant permeability
III. Constant core losses
Iv. Zero leakage reactance
Which of the above statements support the ideal transformer features?
Correct!
Wrong!

I. Zero winding resistance
II. Zero leakage flux
III. Constant core losses
Which of the above statements support the ideal transformer features?
II. Zero leakage flux
III. Constant core losses
Which of the above statements support the ideal transformer features?
Correct!
Wrong!

I. Voltages – inverse ratio
II. Current – direct ratio
III. Impedance – direct ratio squared
Iv. KVA – remains same
Mark the statements which are marked correct for an ideal transformer.
II. Current – direct ratio
III. Impedance – direct ratio squared
Iv. KVA – remains same
Mark the statements which are marked correct for an ideal transformer.
Correct!
Wrong!

Identify the phasor diagram for an ideal transformer at no load
Correct!
Wrong!
