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17 Questions

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Transformer (Basic knowledge)

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Questions and Answers

What is the typical efficiency for miniature transformers?

60%

50% (correct)

70%

40%

In transformer calculations, what does V1 represent?

Current primary side

Output voltage

Input voltage (correct)

Current secondary side

What is the formula for calculating the current on the secondary side of a transformer?

$I2 = I1 \times (N2/N1)$

$I2 = I1 \times (N1/N2)$ (correct)

$I2 = I1 \div (N1/N2)$

$I2 = I1 \div (N2/N1)$

Which type of transformer has the highest typical efficiency according to the information provided?

Transformers with high rated power Signup and view all the answers

How does the ratio of input and output voltage relate to the winding turn numbers in a transformer?

Directly proportional to the winding turn numbers Signup and view all the answers

What is the typical efficiency for small transformers?

80% Signup and view all the answers

What is one advantage of using a transformer with separate windings on the two outer legs?

Less maintenance Signup and view all the answers

In what scenario would an autotransformer be more suitable than a transformer with two windings?

When galvanic isolation is not needed Signup and view all the answers

What is a significant disadvantage of an autotransformer in case of a fault on the primary side?

Secondary side fault occurrence Signup and view all the answers

Which transformer design offers higher efficiency compared to the other?

Autotransformer Signup and view all the answers

What is a distinctive feature of an autotransformer compared to a transformer with two windings?

Galvanic separation Signup and view all the answers

What is the purpose of the iron core in a transformer?

To conduct the magnetic flux between the primary and secondary sides Signup and view all the answers

What happens when a changing magnetic field permeates the secondary winding of a transformer?

It induces an AC voltage in the secondary coil Signup and view all the answers

In transformer construction, what is the purpose of having electrically insulation layers between the individual sheets of the iron core?

To prevent short circuits and reduce eddy currents Signup and view all the answers

What distinguishes shell type transformers from core type transformers?

Core type transformers have windings on the middle leg, whereas shell type transformers do not Signup and view all the answers

What is the main advantage of shell type transformers over core type transformers?

Higher efficiency and more power Signup and view all the answers

How does the number of turns in the windings affect the induced voltage in a transformer according to the text?

The induced voltage increases with an increase in turns Signup and view all the answers