# Objective Questions on Working Principle of Alternator

1. The field system of an alternator is usually excited

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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

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

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

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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

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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

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

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

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13. Three phase alternators are invariably star-connected because

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

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

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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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