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.Management Sciences
Category: Single Phase Induction Motors
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 above
A reluctance motor____________?
A. is self-starting
B. is constant speed motor
C. needs no D.C. excitation
D. all of the above
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
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a___________?
A. magnetic relay
B. thermal relay
C. centrifugal switch
D. none of the above
In a split phase motor____________?
A. the starting winding is connected through a centrifugal switch
B. the running winding is connected through a centrifugal switch
C. both starting and running windings are connected through a centrifugal switch
D. centrifugal switch is used to control supply voltage
In A.C. series motor compensating winding is employed to_____________?
A. reduce the effects of armature reaction
B. increase the torque
C. reduce sparking at the brushes
D. none of the above
The direction of rotation of an hysteresis motor is determined by____________?
A. interchanging the supply leads
B. position of shaded pole with respect to main pole
C. retentivity of the rotor material
D. none of these
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?
A. become unstable
B. draw excessive armature current and may burn out
C. fall out of synchronism and come to stand still
D. run as induction motor
In a two value capacitor motor, the capacitor used for running purposes is_______________?
A. air capacitor
B. paper spaced oil filled type
C. ceramic type
D. a.c. electrolytic type
The speed/load characteristics of a universal motor is same as that of_____________?
A. A.C. motor
B. D.C. shunt motor
C. D.C. series motor
D. none of the above
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