D.C. Generators

51. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be

1. 4
2. 8
3. 16
4. 32

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52. In case of a flat compounded generator

1. voltage generated is less than the rated voltage
2. generated voltage is proportional to the load on the generator
3. voltage remains constant irrespective of the load
4. speed varies in proportion to the load on the generator

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53. In case of D.C. machine winding, number of commutator segments is equal to

1. number of armature coils
2. number of armature coil sides
3. number of armature conductors
4. number of armature turns

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54. In case of D.C. machines, mechanical losses are primary function of

1. current
2. voltage
3. speed
4. none of above

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55. In D.C. generators on no-load, the air gap flux distribution in space is

1. sinusoidal
2. triangular
3. pulsating
4. flat topped

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56. In D.C. generators the polarity of the interpoles

1. is the same as that of the main pole ahead
2. is the same as that of the immediately preceding pole
3. is opposite to that of the main pole ahead
4. is neutral as these poles do not play part in generating e.m.f.

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57. In D.C. generators the pole shoes are fastened to the pole core by

1. rivets
2. counter sunk screws
3. brazing
4. welding

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58. In D.C. generators, current to the external circuit from armature is given through

1. commutator
2. solid connection
3. slip rings
4. none of above

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59. In D.C. generators, lap winding is used for

1. high voltage, high current
2. low voltage, high current
3. high voltage, low current
4. low voltage, low current

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60. In D.C. generators, the brushes on commutator remain in contact with conductors which

1. lie under south pole
2. lie under north pole
3. lie under interpolar region
4. are farthest from the poles

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