Multiple Choice Questions on Transformer 17

  1. Circular coil sections are used because they

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  2. Sludge in transformer oil is due to

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  3. A transformer used only for electrical isolation between two circuits has turns ratio which is

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  4. All power distribution companies installs capacitor bank because this arrangement ensures

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  5. Small transformers below 25 kVA can be easily cooled by

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  6. In air forced cooling, the fans are

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  7. Which is the improved version of oil forced air forced cooling system?

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  8. A 400 / 100 V, 10 kVA two-winding transformer is reconnected as an auto transformer across a suitable voltage source. The maximum kVA is

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  9. While performing short circuit test on a transformer, the impressed voltage magnitude is kept constant but the frequency is increased. The short circuit current will

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  10. Sometime water is used as a cooling medium instead of air, because

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  11. In oil natural air forced cooling

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  12. When the size of entire cooling system must be compact, then we use

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  13. In oil forced air forced cooling system, what element is used to accelerate the flow of oil?

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  14. Natural water may be used as the better ___________________ medium than atmospheric air.

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  15. A transformer has a hysteresis loss of 30 W at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

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  16. What is the actual importance of transformer cooling system?

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  17. Natural thermal convection method is used as the cooling system in

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  18. As the capacity and rating of the transformer increases, more effective cooling system is required because

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  19. The choice of determining the appropriate type of transformer cooling system for particular application depends on

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  20. Highest voltage for transmitting power in India is

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