Electrical And Electronics Test Preparations On Transformers Part 1

Test Preparation on Electrical And Electronics Test Preparations On Transformers Part 1

1.

When does maximum power transfer happen from the source to the load?

1When the source resistance is greater than the load resistance
2When the source resistance is less than the load resistance
3When there is negligible source resistance
4When the source resistance equals the load resistance

2.

The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?

13.54 mH
27.88 mH
339.9 mH
4189.3 mH

3.

Increasing the number of turns of wire on the secondary of a transformer will

1increase the secondary current
2decrease the secondary current
3have no effect on the secondary current
4increase the primary current

4.

The transformer turns ratio determines

1the ratio of primary and secondary voltages
2the ratio of primary and secondary currents
3the reflected impedance
4all

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