Related Questions

The power input to an induction motor is 50 kW when it is running at 4% slip. If the stator resistance and core losses are neglected, the rotor copper loss is
A 30 kW
B 20 kW
C 2 kW
D 4 kW
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
Insertion of resistance in the rotcir 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 rernains same
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
In an induction motor the relationship between stator slots and rotor slots is that
A Stator slots are equal to rotor slots
B Stator slots are exact multiple of rotor slots
C Stator slots are not exact multiple of rotor slots
D None of the above
What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?
A The slip of the motor will be 5%
B The rotor will not run
C The rotor will run at very high speed
D The torque produced will be very large
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
A 4 pole 50 Hz induction motor is running at 1300 rpm. Find the speed of stator magnetic field with respect to the rotor?
A 200 rpm
B 1500 rpm
C 1300 rpm
D 1700 rpm
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
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

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