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Power factor can often be improved by th...

Power factor can often be improved by the use of capacitor of appropriate capacitance in the circuit.

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  • ALTERNATING CURRENTS

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MODERN PUBLICATION-ALTERNATING CURRENTS-EXERCISE
  1. For circuit used for transporting electric power, a low power factor i...

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  2. Why power factor correction is must in heavy machinery?

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  3. Power factor can often be improved by the use of capacitor of appropri...

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  4. Which is more dangerous in use a.c. or d.c.? Explain, why?

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  5. Why 200 V a.c. more dangerous than 220 V d.c.?

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  6. Why 200 V a.c. more dangerous than 220 V d.c.?

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  7. Why is the use of A.C. voltage preferred over D.C. voltage? Give two r...

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  8. The circuit arrangement given in the figure shows that when an ac. pas...

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  9. The circuit arrangement given in the figure shows that when an ac. pas...

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  10. In India domestic power supply is at 220 V, 50Hz. While in USA it is 1...

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  11. What are the factors which reduce the efficiency of a transformer ?

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  12. How are the energy losses reducedin a transformer ?

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  13. What are the factors which reduce the efficiency of a transformer ?

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  14. Why the core of a transformer made of a magnetic material of high perm...

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  15. Why the core of a transformer made of a magnetic material of high perm...

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  16. A step up transformer converts a low input voltage into a high output ...

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  17. Describe the use of transformer for long distance transmission of a.c.

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  18. A transformer of 100% efficiency has 500 turns in the primary and 10,0...

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  19. Can a trasnformer be helpful in reducing the cost of transmission of e...

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  20. What is the fucntion of a choke coil in fluorescent tube?

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