1. Laminations of core are generally made of _______.
2. Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?
3. The armature of D.C. generator is laminated to _______.
4. The resistance of armature winding depends on ______.
5. The field coils of D.C. generator are usually made of _______.
6. The commutator segments are connected to the armature conductors by means of
7. In a commutator is ________.
8. In D.C. generators the pole shoes are fastened to the pole core by
9. According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of
10. Fleming's right-hand rule regarding direction of induced e.m.f., correlates
11. While applying Fleming's right-hand rule to And the direction of induced e.m.f., the thumb points towards
12. The bearings used to support the rotor shafts are generally
13. In D.C. generators, the cause of rapid brush wear may be
14. In lap winding, the number of brushes is always
15. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
16. In a four-pole D.C. machine _______.
17. Copper brushes in D.C. machine are used
18. A separately excited generator as compared to a self-excited generator
19. In case of D.C. machines, mechanical losses are primary function of
20. Iron losses in a D.C. machine are independent of variations in
21. In D.C. generators, current to the external circuit from armature is given through
22. Brushes of D.C. machines are made of ______.
23. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by
24. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be
25. The material for commutator brushes is generally
26. The insulating material used between the commutator segments is normally
27. In D.C. generators, the brushes on commutator remain in contact with conductors which
28. If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
29. Armature reaction of an unsaturated D.C. machine is ______.
30. D.C. generators are connected to the busbars or disconnected from them only under the floating condition
31. Eddy currents are induced in the pole shoes of a D.C. machine due to
32. In a D.C. machine, short-circuited field coil will result in
33. Equilizer rings are required in case armature is
34. Welding generator will have.
35. In case of D.C. machine winding, number of commutator segments is equal to
36. For a D.C. machines laboratory following type of D.C. supply will be suitable
37. The function of pole shoes in the case of D.C. machine is
38. In the case of lap winding resultant pitch is
39. A D.C. welding generator has _______.
40. Which of the following statement about D.C. generators is false ?
41. The demagnetizing component of armature reaction in a D.C. generator
42. Magnetic field in a D.C. generator is produced by
43. The number of brushes in a commutator depends on
44. Compensating windings are used in D.C. generators
45. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?
46. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by
47. In D.C. generators, lap winding is used for
48. Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be
49. The voltage drop for which of the following types of brush can be expected to be least ?
50. The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be
51. In a D.C. generator the actual flux distribution depends upon
52. The armature core of a D.C. generator is usually made of
53. Satisfactory commutation of D.C. machines requires
54. Open circuited armature coil of a D.C. machine is
55. In a D.C. machine, fractional pitch winding is used
56. For the parallel operation of two or more D.C. compound generators, we should ensure that
57. D.C. series generator is used
58. Following D.C. generator will be in a position to build up without any residual magnetism in the poles
59. Interpole flux should be sufficient to
60. D.C. generator generally preferred for charging automobile batteries is
61. In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when
62. Permeance is the reciprocal of
63. In D.C. generators the polarity of the interpoles
64. The e.m.f. generated in a D.C. generator is directly proportional to
65. In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when
66. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except
67. In D.C. generators on no-load, the air gap flux distribution in space is
68. A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly
69. The purpose of providing dummy coils in a generator is
70. In a shunt generator the voltage build up is generally restricted by
71. If a D.C. generator fails to build up the probable cause could not be
72. Flashing the field of D.C. generator means
73. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be
74. In a D.C. generator the critical resistance refers to the resistance of
75. To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them
76. Armature coil is short circuited by brushes when it lies
77. A cumulatively compounded long shunt generator when operating as a motor would be
78. To avoid formation of grooves in the commutator of a D.C. machine
79. The following constitute short-circuit in the armature winding.
80. The rapid wear of brushes takes place due to
81. Number of tappings for each equilizer ring is equal to
82. A D.C. generator can be considered as
83. In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called
84. In a D.C. machine stray loss is the sum of
85. Lap winding is composed of
86. In a D.C. generator in case the resistance of the field winding is increased, then output voltage will
87. An exciter for a turbo generator is a
88. In case of a flat compounded generator
89. Which of the following generator will have negligible terminal voltage while running on no-load ?
90. Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?
91. In over compounded generator, full load terminal voltage is
92. In a level compounded D.C. generator, full load terminal voltage is
93. The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except
94. In a D.C. generator is ________.
95. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave
96. A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be
97. In a separately excited generator supplying rated load the armature reaction is _______.
98. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be
99. Armature reaction in a generator results in _______.
100. Wave winding is composed of _________.
2. Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?
3. The armature of D.C. generator is laminated to _______.
4. The resistance of armature winding depends on ______.
5. The field coils of D.C. generator are usually made of _______.
6. The commutator segments are connected to the armature conductors by means of
7. In a commutator is ________.
8. In D.C. generators the pole shoes are fastened to the pole core by
9. According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of
10. Fleming's right-hand rule regarding direction of induced e.m.f., correlates
11. While applying Fleming's right-hand rule to And the direction of induced e.m.f., the thumb points towards
12. The bearings used to support the rotor shafts are generally
13. In D.C. generators, the cause of rapid brush wear may be
14. In lap winding, the number of brushes is always
15. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
16. In a four-pole D.C. machine _______.
17. Copper brushes in D.C. machine are used
18. A separately excited generator as compared to a self-excited generator
19. In case of D.C. machines, mechanical losses are primary function of
20. Iron losses in a D.C. machine are independent of variations in
21. In D.C. generators, current to the external circuit from armature is given through
22. Brushes of D.C. machines are made of ______.
23. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by
24. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be
25. The material for commutator brushes is generally
26. The insulating material used between the commutator segments is normally
27. In D.C. generators, the brushes on commutator remain in contact with conductors which
28. If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
29. Armature reaction of an unsaturated D.C. machine is ______.
30. D.C. generators are connected to the busbars or disconnected from them only under the floating condition
31. Eddy currents are induced in the pole shoes of a D.C. machine due to
32. In a D.C. machine, short-circuited field coil will result in
33. Equilizer rings are required in case armature is
34. Welding generator will have.
35. In case of D.C. machine winding, number of commutator segments is equal to
36. For a D.C. machines laboratory following type of D.C. supply will be suitable
37. The function of pole shoes in the case of D.C. machine is
38. In the case of lap winding resultant pitch is
39. A D.C. welding generator has _______.
40. Which of the following statement about D.C. generators is false ?
41. The demagnetizing component of armature reaction in a D.C. generator
42. Magnetic field in a D.C. generator is produced by
43. The number of brushes in a commutator depends on
44. Compensating windings are used in D.C. generators
45. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?
46. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by
47. In D.C. generators, lap winding is used for
48. Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be
49. The voltage drop for which of the following types of brush can be expected to be least ?
50. The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be
51. In a D.C. generator the actual flux distribution depends upon
52. The armature core of a D.C. generator is usually made of
53. Satisfactory commutation of D.C. machines requires
54. Open circuited armature coil of a D.C. machine is
55. In a D.C. machine, fractional pitch winding is used
56. For the parallel operation of two or more D.C. compound generators, we should ensure that
57. D.C. series generator is used
58. Following D.C. generator will be in a position to build up without any residual magnetism in the poles
59. Interpole flux should be sufficient to
60. D.C. generator generally preferred for charging automobile batteries is
61. In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when
62. Permeance is the reciprocal of
63. In D.C. generators the polarity of the interpoles
64. The e.m.f. generated in a D.C. generator is directly proportional to
65. In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when
66. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except
67. In D.C. generators on no-load, the air gap flux distribution in space is
68. A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly
69. The purpose of providing dummy coils in a generator is
70. In a shunt generator the voltage build up is generally restricted by
71. If a D.C. generator fails to build up the probable cause could not be
72. Flashing the field of D.C. generator means
73. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be
74. In a D.C. generator the critical resistance refers to the resistance of
75. To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them
76. Armature coil is short circuited by brushes when it lies
77. A cumulatively compounded long shunt generator when operating as a motor would be
78. To avoid formation of grooves in the commutator of a D.C. machine
79. The following constitute short-circuit in the armature winding.
80. The rapid wear of brushes takes place due to
81. Number of tappings for each equilizer ring is equal to
82. A D.C. generator can be considered as
83. In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called
84. In a D.C. machine stray loss is the sum of
85. Lap winding is composed of
86. In a D.C. generator in case the resistance of the field winding is increased, then output voltage will
87. An exciter for a turbo generator is a
88. In case of a flat compounded generator
89. Which of the following generator will have negligible terminal voltage while running on no-load ?
90. Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?
91. In over compounded generator, full load terminal voltage is
92. In a level compounded D.C. generator, full load terminal voltage is
93. The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except
94. In a D.C. generator is ________.
95. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave
96. A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be
97. In a separately excited generator supplying rated load the armature reaction is _______.
98. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be
99. Armature reaction in a generator results in _______.
100. Wave winding is composed of _________.
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