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Single Phase Induction Motors - Interview Questions and Answers

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56. The speed control of universal motor used for sewing machines is by
A. friction
B. varying the resistance
C. tapping the field
D. centrifugal mechanism
Explanation:
57. In repulsion motor, maximum torque is developed when
A. brush axis is at 45� electrical to the field axis
B. brush axis coincides with the field axis
C. brush axis is at 90� electrical to the field axis
D. none of the above
Explanation:
58. In a hysteresis motor, the rotor must have
A. retentivity
B. resistivity
C. susceptibility
D. none of the above
Explanation:
59. The motor used for the compressors is
A. d.c. series motor
B. shaded pole motor
C. capacitor-start capacitor-run motor
D. reluctance motor
Explanation:
60. In repulsion motor direction of rotation of motor
A. is opposite to that of brush shift
B. is the same as that of brush shift
C. is independent of brush shift
D. is the same as that of brush shift
Explanation:
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