DC Generator MCQ

41. The dc generator has poorest voltage regulation.

1. Series
   
2. Shunt
   
3. Compound
   
4. Over-compound

42. Lap winding is suitable for:

1. Low voltage low current dc generators
   
2. High voltage low current dc generators
   
3. High voltage high current dc generators
   
4. Low voltage high current dc generators

43. In DC generator eddy current loss is nothing but

1. iron loss
   
2. friction loss
   
3. windage loss
   
4. copper loss

44. Wave winding is suitable for:

1. Low voltage low current dc generators
   
2. High voltage low current dc generators
   
3. High voltage high current dc generators
   
4. Low voltage high current dc generators

45. What is the use of dummy winding in dc generator?

1. to reduce eddy current loss
2. provides mechanical balance to the rotor
3. increase flux density
4. none of these

46. The function of a commutator in a dc machine is to convert

1. Unidirectional current to direct current
   
2. Alternating current to unidirectional current
   
3. Alternating current to direct current
   
4. Alternating current to alternating current

47. An electrical generator is a machine which converts

1. Electrical energy to electrical energy
   
2. Mechanical energy to mechanical energy
   
3. Electrical energy to mechanical energy
   
4. Mechanical energy to electrical energy

48. In a generator, a dynamically induced emf is produced according to

1. Faraday’s law
   
2. Biot Savarts law
   
3. Ohm’s law
   
4. Kirchoff’s law

49. Compensating windings are used when loads are

1. Have small fluctuations
   
2. Fluctuations of all kinds
   
3. Steady
   
4. Have large fluctuations

50. The break test for the determination of the efficiency of a DC machine is

1. an indirect method
   
2. a regenerative method
   
3. a direct method
   
4. None of these