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Why is the use of AC voltage preferred o...

Why is the use of AC voltage preferred over DC voltage ? Give two reasons .

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MODERN PUBLICATION-ALTERNATING CURRENT -Revision Exercises Short Answer Questions
  1. Give three elements X, Y and Z to be connected across an ac source . W...

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  2. A capacitor C a variable resistor R and a bulb B are connected in seri...

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  3. Why is the use of AC voltage preferred over DC voltage ? Give two reas...

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  4. A voltage V = V(0)sinomegat is applied to a series LCR circuit. Derive...

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  5. Draw the phasor diagram of a series LCR connected across an ac source ...

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  6. (a) For a given a.c., i = i(m) sin wt, show that the average power dis...

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  7. (a) In a series LCR circuit connected across an AC source of varible f...

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  8. What is electric resonance ?

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  9. Write down the condition of resonance in series L-C-R circuit and henc...

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  10. An inductor L of inductance X(L) is connected in series with a bulb B ...

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  11. Answer the following questions : (a) In any a.c. circuit, is the app...

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  12. What is the power dissipation in an AC circuit in which voltage and cu...

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  13. Obtain anexpression for the average power of an a.c circuit .

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  14. What is wattless current ?

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

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

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

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

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

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

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