The rotor of a hysteresis motor is made of___________?
The rotor of a hysteresis motor is made of___________?
A. aluminium
B. cast iron
C. chrome steel
D. copper
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Which of the following motors has highest starting torque ?
Which of the following motors has highest starting torque ?A. Repulsion motor
B. Shaped pole motor
C. Capacitor-start motor
D. Split-phase motorIn a shaded pole motor, the shading coil usually consist of___________?
In a shaded pole motor, the shading coil usually consist of___________?A. a single turn of heavy wire which is in parallel with running winding
B. a single turn of heavy copper wire which is short-circuited and carries only induced current
C. a multilayer fine gauge copper wire in parallel with running winding
D. none of the aboveThe capacitors used in single-phase capacitor motors have no__________?
The capacitors used in single-phase capacitor motors have no__________?A. voltage rating
B. dielectric medium
C. polarity marking
D. definite valueIn repulsion motor, zero torque is developed when___________?
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)In a hysteresis motor, the rotor must have____________?
In a hysteresis motor, the rotor must have____________?A. retentivity
B. resistivity
C. susceptibility
D. none of the aboveShort-circuiter is used in_____________?
Short-circuiter is used in_____________?A. repulsion induction motor
B. repulsion motor
C. repulsion start induction run motor
D. none of the above