Related Questions

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
If starting winding of a single-phase induction motor is left in the circuit, it will
A run faster
B spark at light loads
C draw excessive current and overheat
D run slower
While starting a synchronous motor by induction motor action, field winding is usually
A connected to D.C. supply
B short-circuited by low resistance
C kept open-circuited
D none of the above
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods
The starting winding of a single-phase motor is placed in
A Armature
B Field
C Rotor
D Stator
Torque developed by a single phase induction motor at starting is
A pulsating
B uniform
C none of the above
D nil
A capacitor-start single phase induction motor is switched on to supply with its capa-citor replaced by an inductor of equivalent reactance value. It will
A start and then stop
B start and run slowly
C start and run at rated speed
D not start at all
Temperature of the stator winding of a three phase induction motor is obtained by
A Resistance rise method
B Thermometer method
C Embedded temperature method
D All above methods
In a three-phase induction motor, the number of poles in the rotor winding is always
A Zero
B More than the number of poles in stator
C Less than number of poles in stator
D Equal to number of poles in stator
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above

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