What is the working principle of transformer?

What is the working principle of transformer?
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Answer :

A transformer works under the principle of mutual electro magnetic induction (Faraday’s laws of Electro-magnetic induction). It says that, when ever a changing flux links with a coil an emf is induced in it and this induced emf is proportional to the rate of change of flux and the number of turns in the coils linking the flux.
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In the illustrated circuit, if the input to leads 'B' and 'Y' was 24 VDC the output between 'A' and 'X' will be _________. EL-0069 A. 24 VDC B. 22.8 VDC, 24 VDC minus the 1.2 VDC voltage drop across two diodes C. undeterminable without knowing the turns ratio of the transformer D. 0 VDC

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Description : The transistors in the illustrated circuit are connected using what type of coupling? EL-0049 A. RC coupling B. transformer coupling C. LC coupling D. direct coupling

Last Answer : Answer: B

In the illustrated 450 VAC system, what should be provided between the bus and the device labeled 'F'? EL-0003 A. a potential transformer B. a current transformer C. an emergency disconnect device D. an audible alarm and indicating light

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Description : The transistors in the illustrated circuit are connected using what type of coupling? EL-0048 A. RC coupling B. transformer coupling C. LC coupling D. direct coupling

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