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Describe the principle and theory of a t...

Describe the principle and theory of a transformer . Why the efficiency of a transformer is always less than unity?

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When the speed of rotation of coil is doubled, the frequency of rotation and emf both will be doubled.
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MODERN PUBLICATION-ALTERNATING CURRENT -Revision Exercises Short Answer Questions
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  8. Obtain anexpression for the average power of an a.c circuit .

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  9. What is wattless current ?

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  10. What is power factor of an LCR circuit ? Explain on the basis of power...

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  11. Given below are two electric circuits A and B. Calculate the rat...

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  12. Describe the principle and theory of a transformer . Why the efficienc...

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  13. With the help of a labelled diagram explain the working of a transform...

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  14. Electrical energy is transmitted over large distances at high alternat...

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  15. Why cannot a transformer be used to step up d.c. voltage ?

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  16. The core of a transformer is made of magnetic material of high permean...

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  17. State the principle of an ac generator.

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  18. An a.c. generator having a constant magnetic field is conneted to a re...

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  19. Can a.c. source be connected to a circuit and yet deliver no power to ...

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  20. At resonance in an LCR circuit the emf and current are (i) in phase ...

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