1. No-load speed of which of the following motor will be highest ?
2. The direction of rotation of a D.C. series motor can be changed by
3. Which of the following application requires high starting torque ?
4. If a D.C. motor is to be selected for conveyors, which motor would be preferred ?
5. Which D.C. motor will be preferred for machine tools ?
6. Differentially compound D.C. motors can find applications requiring
7. Which D.C. motor is preferred for elevators ?
8. According to Fleming's left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of
9. If the field of a D.C. shunt motor gets opened while motor is running
10. Starters are used with D.C. motors because
11. In D.C. shunt motors as load is reduced
12. A D.C. series motor is that which
13. For starting a D.C. motor a starter is required because
14. The type of D.C. motor used for shears and punches is
15. If a D.C. motor is connected across the A.C. supply it will
16. To get the speed of D.C, motor below the normal without wastage of electrical energy is used.
17. When two D.C. series motors are connected in parallel, the resultant speed is
18. The speed of a D.C. shunt motor more than its full-load speed can be obtained by
19. In a D.C. shunt motor, speed is ______.
20. A direct on line starter is used: for starting motors
21. What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
22. In case of D.C. shunt motors the speed is dependent on back e.m.f. only because
23. In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be
24. These days D.C. motors are widely used in ______.
25. By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
26. In which of the following applications D.C. series motor is invariably tried?
27. In D.C. machines fractional pitch winding is used
28. A three point starter is considered suitable for _______.
29. In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
30. The ratio of starting torque to full-load torque is least in case of
32. In D.C. motor which of the following can sustain the maximum temperature rise?
33. Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
34. Which of the following load normally needs starting torque more than the rated torque?
35. The starting resistance of a D.C. motor is generally ______.
36. The speed of a D.C. series motor is ______.
37. In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
38. The current drawn by the armature of D.C. motor is directly proportional to
39. The power mentioned on the name plate of an electric motor indicates
40. Which D.C. motor has got maximum self loading property?
41. Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
42. If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens
43. D.C. series motors are used ______.
44. For the same H.P. rating and full load speed, following motor has poor starting torque
45. In case of conductively compensated D.C. series motors, the compensating winding is provided
46. Sparking at the commutator of a D.C. motor may result in
47. Which of the following motor is preferred for operation in highly explosive atmosphere ?
48. If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
49. Which one of the following is not the function of pole shoes in a D.C. machine ?
50. The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is
51. The condition for maximum power in case of D.C. motor is ______.
52. For which of the following applications a D.C. motor is preferred over an A.C. motor ?
53. In D.C. machines the residual magnetism is of the order of _______.
54. Which D.C. motor is generally preferred for cranes and hoists ?
55. Three point starter can be used for _______.
56. Sparking, is discouraged in a D.C. motor because ________.
57. Speed control by Ward Leonard method gives uniform speed variation
58. Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be
59. Following motor is used where high starting torque and wide speed range control is required.
60. In a differentially compounded D.C. motor, if shunt field suddenly opens
61. Which of the following motor has the poorest speed regulation ?
62. Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of
63. As -the load is increased the speed of D.C. shunt motor will
64. The armature torque of the D.C. shunt motor is proportional to
65. Which of the following method of speed control of D.C. machine will offer minimum efficiency ?
66. Usually wide and sensitive speed control is desired in case of ______.
67. The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is
68. The armature voltage control of D.C. motor provides ________.
69. As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit
70. The speed of a D.C. shunt motor can be increased by
71. If I2 be the armature current, then speed of a D.C. shunt motor is
72. In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
73. At the instant of starting when a D.C. motor is put on supply, it behaves like
74. The speed of a D.C. motor can be varied by varying
75. Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors ?
76. For a D.C. shunt motor if the excitation is changed
77. Which motor has the poorest speed control?
78. The plugging gives the _______.
79. The armature voltage control of D.C. motor provides
80. If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor
81. If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking
82. Which of the following motors one will choose to drive the rotary compressor ?
83. If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will
84. Why are the D.C. motors preferred for traction applications ?
85. Which of the following motors is usually used in house-hold refrigerators ?
86. Which of the following motors is most suitable for signalling devices and many kinds of timers ?
87. Which motor should not be started on no-load ?
88. Ward-Leonard control is basically a _______.
89. For constant torque drive which speed control method is preferred ?
90. In Ward-Leonard control the lower limit of speed is imposed by
91. The main disadvantage of the Ward-Leonard control method is
92. Regenerative method of braking is based on that
93. The hysteresis loss in a D.C. machine least depends on ______.
94. In a D.C. generator all of the following could be the effects of iron losses except
95. The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?
96. Which of the following loss in a D.C. generator varies significantly with the load current ?
97. Torque developed by a D.C. motor depends upon ______.
98. D.C. shunt motors are used for driving _____.
99. In a manual shunt motor starter ______.
100. Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?
2. The direction of rotation of a D.C. series motor can be changed by
3. Which of the following application requires high starting torque ?
4. If a D.C. motor is to be selected for conveyors, which motor would be preferred ?
5. Which D.C. motor will be preferred for machine tools ?
6. Differentially compound D.C. motors can find applications requiring
7. Which D.C. motor is preferred for elevators ?
8. According to Fleming's left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of
9. If the field of a D.C. shunt motor gets opened while motor is running
10. Starters are used with D.C. motors because
11. In D.C. shunt motors as load is reduced
12. A D.C. series motor is that which
13. For starting a D.C. motor a starter is required because
14. The type of D.C. motor used for shears and punches is
15. If a D.C. motor is connected across the A.C. supply it will
16. To get the speed of D.C, motor below the normal without wastage of electrical energy is used.
17. When two D.C. series motors are connected in parallel, the resultant speed is
18. The speed of a D.C. shunt motor more than its full-load speed can be obtained by
19. In a D.C. shunt motor, speed is ______.
20. A direct on line starter is used: for starting motors
21. What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
22. In case of D.C. shunt motors the speed is dependent on back e.m.f. only because
23. In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be
24. These days D.C. motors are widely used in ______.
25. By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
26. In which of the following applications D.C. series motor is invariably tried?
27. In D.C. machines fractional pitch winding is used
28. A three point starter is considered suitable for _______.
29. In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
30. The ratio of starting torque to full-load torque is least in case of
32. In D.C. motor which of the following can sustain the maximum temperature rise?
33. Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
34. Which of the following load normally needs starting torque more than the rated torque?
35. The starting resistance of a D.C. motor is generally ______.
36. The speed of a D.C. series motor is ______.
37. In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
38. The current drawn by the armature of D.C. motor is directly proportional to
39. The power mentioned on the name plate of an electric motor indicates
40. Which D.C. motor has got maximum self loading property?
41. Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
42. If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens
43. D.C. series motors are used ______.
44. For the same H.P. rating and full load speed, following motor has poor starting torque
45. In case of conductively compensated D.C. series motors, the compensating winding is provided
46. Sparking at the commutator of a D.C. motor may result in
47. Which of the following motor is preferred for operation in highly explosive atmosphere ?
48. If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
49. Which one of the following is not the function of pole shoes in a D.C. machine ?
50. The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is
51. The condition for maximum power in case of D.C. motor is ______.
52. For which of the following applications a D.C. motor is preferred over an A.C. motor ?
53. In D.C. machines the residual magnetism is of the order of _______.
54. Which D.C. motor is generally preferred for cranes and hoists ?
55. Three point starter can be used for _______.
56. Sparking, is discouraged in a D.C. motor because ________.
57. Speed control by Ward Leonard method gives uniform speed variation
58. Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be
59. Following motor is used where high starting torque and wide speed range control is required.
60. In a differentially compounded D.C. motor, if shunt field suddenly opens
61. Which of the following motor has the poorest speed regulation ?
62. Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of
63. As -the load is increased the speed of D.C. shunt motor will
64. The armature torque of the D.C. shunt motor is proportional to
65. Which of the following method of speed control of D.C. machine will offer minimum efficiency ?
66. Usually wide and sensitive speed control is desired in case of ______.
67. The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is
68. The armature voltage control of D.C. motor provides ________.
69. As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit
70. The speed of a D.C. shunt motor can be increased by
71. If I2 be the armature current, then speed of a D.C. shunt motor is
72. In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
73. At the instant of starting when a D.C. motor is put on supply, it behaves like
74. The speed of a D.C. motor can be varied by varying
75. Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors ?
76. For a D.C. shunt motor if the excitation is changed
77. Which motor has the poorest speed control?
78. The plugging gives the _______.
79. The armature voltage control of D.C. motor provides
80. If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor
81. If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking
82. Which of the following motors one will choose to drive the rotary compressor ?
83. If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will
84. Why are the D.C. motors preferred for traction applications ?
85. Which of the following motors is usually used in house-hold refrigerators ?
86. Which of the following motors is most suitable for signalling devices and many kinds of timers ?
87. Which motor should not be started on no-load ?
88. Ward-Leonard control is basically a _______.
89. For constant torque drive which speed control method is preferred ?
90. In Ward-Leonard control the lower limit of speed is imposed by
91. The main disadvantage of the Ward-Leonard control method is
92. Regenerative method of braking is based on that
93. The hysteresis loss in a D.C. machine least depends on ______.
94. In a D.C. generator all of the following could be the effects of iron losses except
95. The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?
96. Which of the following loss in a D.C. generator varies significantly with the load current ?
97. Torque developed by a D.C. motor depends upon ______.
98. D.C. shunt motors are used for driving _____.
99. In a manual shunt motor starter ______.
100. Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?
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