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Engineering Talks

Conceptual Questions

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  1. Explain the method for testing the dielectric strength of insulating oil according to IS specifications.

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  3. Describe the various high voltage tests that are carried out on porcelain insulators.

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  4. Describe the working of Marx circuit used for impulse testing.

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  5. Describe the circuit of a single stage impulse generator

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  6. Explain why transmission lines and cables, which are used for power transmission and distribution of a.c. voltages, are tested with high voltage d.c.

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  7. Describe the Cockcroft Walton circuit for production of high voltage d.c.

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  8. Describe the working, advantages and disadvantages of the following types of voltmeters used for measurement of peak values of high voltages.

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  9. Describe the rectified capacitor charging current method for measurement of peak values of high voltages.

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  10. Describe the use of sphere gaps for measurement of peak voltages

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  11. Explain the following potential divider methods for measurement of r.m.s. value of high voltages,

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  12. Describe the different electrostatic type of voltmeters used for measurement of r.m.s. value of high voltages

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  13. Draw the circuit diagram for high voltage testing at power frequencies.

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  14. Describe the different methods of voltage control used for high voltage test circuits.

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  15. Explain the reasons for connecting H.V. transformers in cascade.

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  16. Describe the constructional details of a H.V. transformer and explain the reasons for difference in construction of H.V. testing transformers and power transformers.

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  17. Why is high voltage testing important for electrical power apparatus and insulating materials ?

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  18. Explain a method for testing of permanent magnets.

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  19. Explain the oscillographic method of determination of hysteresis loop of a magnetic material.

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  20. What is Nuclear Magnetic Resonance ?

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  21. Describe how magnetizing and loss components of no load current of a transformer be determined by using an a.c. potentiometer.

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  22. Explain how the value of a.c. permeability of magnetic materials is determined through the use of :

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  23. Describe the Lloyd Fisher square for measurement of iron losses in a specimen of laminations.

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  24. Explain the methods of separation of iron losses into their two components : eddy current and hysteresis losses, if the maximum value of flux density is maintained constant and

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  25. Describe the construction and working of following types of permeameters :

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  26. What are Permeameters ?

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