A. pulsating
B. uniform
C. none of the above
D. nil
Torque developed by a single phase induction motor at starting is_____________? Read More »
Single Phase Induction Motors A. friction
B. varying the resistance
C. tapg the field
D. centrifugal mechanism
The speed control of universal motor used for sewing machines is by____________? Read More »
Single Phase Induction Motors A. capacitor run motor
B. hysteresis motor
C. universal motor
D. repulsion motor
The electric motor used in portable drills is__________? Read More »
Single Phase Induction Motors A. retentivity
B. resistivity
C. susceptibility
D. none of the above
In a hysteresis motor, the rotor must have____________? Read More »
Single Phase Induction Motors A. equal to full load current
B. less than full load current
C. slightly more than full load current
D. several times the full load current
Locked rotor current of a shaded pole motor is____________? Read More »
Single Phase Induction Motors A. It requires more maintenance of commutator and other mechanical devices
B. It makes quite a bit of noise on starting
C. In fractional horse power motors, it has replaced the capacitor motors
D. It is not easily reversed
A. running winding
B. rotor winding
C. field winding
D. compensating winding
A. smaller brush width
B. less number of field turns
C. more number of armature turns
D. less air gap
E. all of the above
A.C. series motor as compared to D.C. series motor has__________? Read More »
Single Phase Induction Motors A. it revolves synchronously
B. it is not subject to any magnetic or mechanical vibrations
C. it can be easily manufactured in extremely small sizes of up to 1 W output
D. it develops hysteresis torque which is extremely steady both in amplitude and phase
A. It requires only one winding
B. It can rotate in one direction only
C. It is self-starting
D. It is not self-starting
Which of the following statements regarding single-phase induction motors correct? Read More »
Single Phase Induction Motors