Related Questions

In a three-phase induction motor, the number of poles in the rotor winding is always
A Zero
B More than the number of poles in stator
C Less than number of poles in stator
D Equal to number of poles in stator
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
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 purpose of stator winding in the compensated repulsion motor is to
A provide mechanical balance
B improve power factor and provide better speed regulation
C prevent hunting in the motor
D eliminate armature reaction
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
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
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

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