Related Questions

A 4 pole 50 Hz induction motor is running at 1300 rpm. Find the speed of stator magnetic field with respect to the rotor?
ক 200 rpm
খ 1500 rpm
গ 1300 rpm
ঘ 1700 rpm
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
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
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
Which of the following losses is not dissipated by the stator core surface in a synchronous motor ?
ক Eddy current losses in the conductors
খ Iron losses in the stator
গ Copper losses in the slot portion of the conductors
ঘ Windage losses
Insertion of resistance in the stator of an induction motor
ক Increases the load torque
খ Decreases the starting torque
গ Increases the starting torque
ঘ None of the above
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
Slip ring motor is preferred over squirrel cage induction motor where
ক High starting torque is required
খ Load torque is heavy
গ Heavy pull out torque is required
ঘ All 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
Insertion of resistance in the rotor of an induction motor to develop a given torque
ক Decreases the rotor current
খ Increases the rotor current
গ Rotor current becomes zero
ঘ Rotor current remains same

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