Q5 of 14 Page 56

Given below is a graph of the output from the secondary coil of a transformer. Observe the graph and answer the following questions.


(a) The electricity produced from which type of generator does the given graph represent?


(b) The maximum and minimum voltages in A, B, C are the same Give the reason.

(a) Electricity has been produced by a three-phase generator.

(b) The maximum and minimum voltages in A, B, C are the same because there are 3 identical windings that are placed 120 electrical degrees apart from each other. The loads are balanced.


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The current in the secondary coil of a transformer is 1A and that in the primary is 0.5 A.

Explain the working principle of a transformer.

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In connection with the working of a microphone, a few statements are given in boxes.

Arrange them in the proper order.


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Thick insulated copper wires are used in the primary coil of a step up transformer and in the secondary of a step-down transformer. What is the necessity of doing this? Why is it so?

 1


(a) Write down the name of parts numbered in the diagram.


(b) State the working principle of this device.