Electrical Machines Interview Questions

Electrical Machines Interview Questions

1. What is a Transformer
2. How are Primary and secondary windings of a Transformer connected
3. Name different types of Transformer based on Number of windings
4. Where Transformers are applicable
5. How does electrical energy transfer takes place in Transformers
6. Why does Transformers are know as to have high efficiency
7. What are the two general type of Transformers based on in which manner windings
Are Wound

Transformers

22. How can we express volts, amperes, and ohms etc in Per Unit Values what is it
Necessary
23. What is voltage regulation of a Transformer
24. Why do we perform Polarity tests on Transformers
25. Why do we perform load test or Sumpner’s test on Transformers
26. What is efficiency and condition for maximum efficiency in a transformer
27. What are the conditions to be satisfied for parallel operation of transformers
28. What are Stray load and Dielectric losses
29. What are Hysteresis and Eddy current losses
30. What are Tap changers on Transformers and what is their need
31. What is need of Induction regulators in Transformers
32. What are Three Phase Transformers give their four Standard connections
33. What factors causes Noise in a Transformer and How can we reduce it
34. What is Electromagnetic energy conversion Principles
35. What is Coupling Field reaction
36. What is a motor and the principle involved in the motor
37. What is the generator and the principle involved in generator
38. What is Electromagnetic or Interaction torque
39. What is Reluctance or Alignment toque
40. What are the differences between Dc and Ac machines
41. What does the stator consists of
42. What does the Rotor consists of
43. What is Pole-Pitch
44. What are Electrical and Mechanical degrees
45. What is flux per pole
46. What are full pitched and short pitched coils
47. What are Synchronous and Induction machines
48. What is Synchronization
49. Explain the Armature and Field windings of Synchronous machine
50. Explain the Stator and Rotor windings of Induction Machines
51. How does the E.M.F generation takes place in Dc machine
52. How are Synchronous machines classified
53. How are Inductions Machines classified
54. What are Slip ring Induction machines
55. What are Squirrel cage Induction machines
56. What are Salient pole Synchronous Machines
57. What are Non Salient pole Synchronous Machines
58. What is the difference between single phase and Poly phase Synchronous Machines
59. What is the difference between single phase and Poly phase Induction machines
60. What is Synchronous speed
61. What are heating and cooling curves of Induction machines
62. What are Synchronous compensators
63. Mention the applications of Synchronous generators and motors
64. mention the applications of Induction motors and generators
65. What is starting torque66. What is pull-out-torque
67. What is pull in torque
68. What are different cooling methods
69. What are Mechanical losses
70. What are speed torque characteristics
71. What are different methods of Machines
72. Explain Self excitation
73. Explain Separate excitation
74. What is Armature Reaction
75. What are Stationary parts of a D.C motor
76. What are rotary parts of D.C motor
77. What is a commutator
78. What is commutator action
79. What is rocker
80. What are Brushes
81. What are Interpoles
82. What is Yoke
83. What is field poles
84. What is Field windings
85. What is Compensating Windings
86. What is Armature core
87. What is armature windings
88. What is Shaft
89. What are Ratings of a Motor
90. What is Cross Magnetization
91. What is De-Magnetization
92. What are the effects of Armature reaction
93. What are the different methods employed in limiting Armature reaction
94. What are the effects of Brush shifts
95. What are different operating characteristics of D.C generators
96. What is Generating mode
97. What is Motor mode
98. What is Magnetization curve
99. What are Cumulative compound generators
100. What are Shunt Generators
101. What are series Generators
102. What are operating characteristics of D.C Motors
103. What is D.C compound Motor
104. What are the necessary conditions to be obtained for staring of a Motor
105. What are stators
106. What is external resistance
107. What factors influence the speed of a D.C motor
108. How does the speed control of motors takes place
109. What do you mean by Speed Regulation
110. What are shunt motors
111. What are series motors
112. What is Ward Leonard method1
113. What is Armature voltage control method
114. How does speed control can be obtained in motors by using SCR’S115. How does testing of D.C machines takes place
116. What is Direct method of testing
117. What is Swinburne’s or indirect method of testing
118. What is Regenerative or Hopkinson’s method of testing
119. What is Brake test
120. What are Rotating Amplifiers
121. What is Power Factor
122. What are Permanent magnet Dc Motors
123. What are the two types of Armature windings
124. What are the Advantages of stationary armature
125. What happens if the Armature coil is opened
126. What happens if the field coil is opened
127. Why does sparking occurs in a commutator
128. What are the advantages of Non salient or cylindrical rotor over Salient pole rotor
129. What is pitch factor
130. What is breath factor
131. What are Harmonics
132. How can we reduce the effect of harmonics
133. What is Tooth Ripple
134. What are the methods of excitation of a Synchronous machines135. What is static excitation System
136. What is brushless excitation system
137. How does cooling of Synchronous machines takes place
138. What is voltage regulation of an Alternator
139. What are the different methods of finding voltage regulation
140. What is m.m.f method
141. What is potier method
142. What is A.S.A method
143. What is synchronous Impedance method
144. What is two reaction theory
145. What is slip test
146. How can we determine Xd and Xq
147. What does Synchronisation of Alternators mean
148. What are different methods of Synchronising alternators
149. What is Dark lamp method
150. What is Bright lamp method
151. What is Synchroscope method
152. What is Synchronizing power
153. What is Synchronizing Torque
154. What is synchronizing Current
155. Can you explain the Parallel operation of Alternators
156. What is the effect of change in excitation
157. What is the effect of change in input power
158. Explain the operation of alternators on infinite bus
159. How does load gets affect with speed in Synchronous machines
160. What is the effect of field excitation in Synchronous motor
161. What are V and inverted V curves
162. What is normal excitation
163. What is under excitation
164. What is Over excitation
165. What is Synchronous condenser
166. What are the different methods of starting of Synchronous motors
167. What is a pony motor
168. Why single phase Induction motors are not self starting
169. Why poly phase induction motors are self starting
170. What is meant by Cogging in Induction motors
171. What is meant by Skew in Induction motors
172. What is meant by Crawling in Induction motors
173. What is double field revolving Theory
174. What is Cross field revolving theory
175. What are different stating methods of induction motors

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Electrical Machines Interview Questions 700120

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Electrical Machines Interview Questions 604369

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