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
ক 30 kW
খ 20 kW
গ 2 kW
ঘ 4 kW
What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?
ক The slip of the motor will be 5%
খ The rotor will not run
গ The rotor will run at very high speed
ঘ The torque produced will be very large
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
ক Slop speed operation
খ High starting torque
গ Low windage losses
ঘ All 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
ক induction motor torque in field winding
খ induction motor torque in damper winding
গ eddy current and hysteresis torque in pole faces
ঘ reHetance motor torque due to saliency of the rotor
ঙ all of the above methods
In which of the following motors the stator and rotor magnetic field rotate at the same speed ?
ক Universal motor
খ Synchronous motor
গ Induction motor
ঘ Reluctance motor
In an induction motor the relationship between stator slots and rotor slots is that
ক Stator slots are equal to rotor slots
খ Stator slots are exact multiple of rotor slots
গ Stator slots are not exact multiple of rotor slots
ঘ None of the above
The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of
ক zero degree
খ two degrees
গ five degrees
ঘ ten degrees
When a 400V, 50Hz, 6-pole induction motor is rotating at 960 rpm on no-load, its slip is -
ক 1%
খ 2%
গ 3%
ঘ 4%
When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor
ক remains same as the original value
খ decreases to half the original value
গ tends to becomes zero
ঘ increases to two times the original value
The torque of a rotor in an induction motor under running condition is maximum
ক At the unit value of slip
খ At the zero value of slip
গ At the value of the slip which makes rotor reactance per phase equal to the resistance per phase
ঘ At the value of the slip which makes the rotor reactance half of the rotor

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