Related Questions

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
Torque developed by a single phase induction motor at starting is
A pulsating
B uniform
C none of the above
D nil
The starting torque of a squirrel-cage induction motor is
A low
B negligible
C same as full-load torque
D slightly more than full-load torque
The ratio of starting torque to running torque in a synchronous motor is
A zero
B one
C two
D infinity
The stating torque of the slip ring induction motor can be increased by adding
A External inductance to the rotor
B External resistance to the rotor
C External capacitance to the rotor
D Both resistance and inductance to rotor
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
__________ method of starting a three phase induction motor needs six terminals.
A Star-delta
B Resistance starting
C Autotransformer
D None of the above
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
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on
A running winding
B rotor winding
C field winding
D compensating winding
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

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