Related Questions

Insertion of resistance in the rotor of an induction motor to develop a given torque
A Decreases the rotor current
B Increases the rotor current
C Rotor current becomes zero
D Rotor current remains same
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
Insertion of resistance in the stator of an induction motor
A Increases the load torque
B Decreases the starting torque
C Increases the starting torque
D None of the above
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
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as
A locked-rotor torque
B synchronous torque
C pull up torque
D reluctance torque
The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as
A slip torque
B pull-out torque
C breaking torque
D synchronising torque
A synchronous motor can develop synchronous torque
A when under loaded
B while over-excited
C only at synchronous speed
D below or above synchronous speed
The starting torque of a three phase induction motor can be increased by
A Increasing slip
B Increasing current
C Both (A) and (B)
D None of the above
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
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

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