Computer Programming MCQs

5739 MCQs  (Page 76 of 574)

In a hysteresis motor, the rotor must have____________?
A. Retentivity
B. Resistivity
C. Susceptibility
D. None of the above
The electric motor used in portable drills is__________?
A. Capacitor run motor
B. Hysteresis motor
C. Universal motor
D. Repulsion motor
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
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
In split phase motor main winding is of _____________?
A. Thin wire placed at the top of the slots
B. Thin wire placed at the bottom of the slots
C. Thick wire placed at the bottom of the slots
D. Thick wire placed at the top of the” slots
If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in_________?
A. Damage to the starting winding
B. Damage to the centrifugal switch
C. Overloading of running winding
D. None of the above