Objective Questions on Working Principle of Alternator

  1. The field system of an alternator is usually excited

    Under construction.

  2. Alternator operates on the principle of

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  3. In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

    Under construction.

  4. In an alternator the voltage generated per phase is proportional to

    Under construction.

  5. The speed of a 4-pole 60 Hz synchronous machine will be

    Under construction.

  6. The speed of a p-pole synchronous machine in rpm is given by

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  7. The aircraft alternators are designed to generate emf of high frequency of 400 Hz in order to

    Under construction.

  8. The angle between induced emf and terminal voltage on no-load for a single phase alternator is

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  9. Three phase alternators are invariably connected in star so as to

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  10. The armature of a single phase alternator is completely wound with T turn coils distributed uniformly. The induce voltage in each turn is 2 V(rms). The emf of the whole winding is

    Under construction.

  11. The maximum electric current that can be supplied by an alternator depends upon

    Under construction.

  12. Two alternators 'A' and 'B' are sharing an inductive load equally. If the excitation of alternator 'A' is increased

    Under construction.

  13. Three phase alternators are invariably star-connected because

    Under construction.

  14. Fleming's left hand rule may be applied to an electric generator to find out the direction of

    Under construction.

  15. Modern 3-phase alternator of a central power station will have generated voltage of

    Under construction.

  16. In an alternator, voltage drops occurs in

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  17. The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

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  18. Unbalance 3-phase stator currents cause

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  19. The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

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  20. Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

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