Related Questions

Slip ring motor is preferred over squirrel cage induction motor where
A High starting torque is required
B Load torque is heavy
C Heavy pull out torque is required
D All 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
In the squirrel-cage induction motor the rotor slots are usually given slight skew
A To reduce the magnetic hum and locking tendency of the rotor
B To increase the tensile strength of the rotor bars
C To ensure easy fabrication
D None of the above
In squirrel cage induction motors, the rotor slots are usually given slight skew in order to
A Reduce windage losses
B Reduce eddy currents
C Reduce accumulation of dirt and dust
D Reduce magnetic hum
A double squirrel-cage induction motor has
A Two rotors moving in opposite direction
B Two parallel windings in stator
C Two parallel windings in rotor
D Two series windings in stator
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
Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor?
A By changing the number of stator poles
B Rotor rheostat control
C By operating two motors in cascade
D By injecting e.m.f. in the rotor circuit
When the equivalent circuit diagram of double squirrel-cage induction motor is constructed the two cages can be considered
A In series
B In parallel
C In series-parallel
D In parallel with stator
A squirrel cage induction motor is not selected when
A Initial cost is the main consideration
B Maintenance cost is to be kept low
C Higher starting torque is the main consideration
D All above considerations are involved
The speed of a squirrel-cage induction motor can be controlled by all of the following except
A Changing supply frequency
B Changing number of poles
C Changing winding resistance
D Reducing supply voltage

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