| 1. | Due to which of the following reasons concentrated windings are not used in alternators ? | |
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Concentrated windings increase voltage harmonics
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Concentrated windings decrease induced e.m.f./phase
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Concentrated windings increase copper-to-iron ratio thereby decreasing the capacity
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Concentrated windings require deep slots for accommodation which leads to increased armature leakage and reactance
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Report Question| 2. | Salient pole type alternators are generally used on ? | |
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low voltage alternators
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hydrogen cooled prime movers
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high speed prime movers
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low and medium speed prime movers
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| 3. | ln case of a uniformly distributed winding, the value of distribution factor is ? | |
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0.65
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0.76
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0.85
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0.995
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| 4. | Regulation of an alternator supplying leading load is ? | |
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always negative
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always positive
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sometimes positive and sometimes negative depending upon load and power factor
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All of the above
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| 5. | Unbalanced three-phase stator currents ? | |
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vibration
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heating of rotor
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double frequency currents in the rotor
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all of the above
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