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Single Phase Induction Motors - Interview Questions and Answers

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66. Which motor is normally free from mechanical and magnetic vibrations ?
A. Split phase motor
B. Universal motor
C. Hysteresis motor
D. Shaded pole motor
Explanation:
67. Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.
A. shunt motor
B. series motor
C. compound motor
D. separately excited motor
Explanation:
68. The shaded pole motor is used for
A. high starting torque
B. low starting torque
C. medium starting torque
D. very high starting torque
Explanation:
69. Which of the following motors is used in a situation where load increases with speed ?
A. Induction motor
B. Three-phase series motor
C. Schrage motor
D. Hysteresis motor
Explanation:
70. In repulsion motor, zero torque is developed when
A. brush axis is 45� electrical to field axis
B. brush axis coincides with the field axis
C. brush axis is 90� electrical to field axis
D. both (b) and (c)
Explanation:
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