Related Questions

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
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 three-phase squirrel-cage induction motors
A Rotor conductor ends are short-circuited through slip rings
B Rotor conductors are short-circuited through end rings
C Rotor conductors are kept open
D Rotor conductors are connected to insulation
In squirrel cage induction motors which of the following methods of starting cannot be used?
A Resistance in rotor circuit
B Resistance in stator circuit
C Autotransformer starting
D Star-delta starting
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
The number of slip rings on a squirrel cage induction motor is usually
A Two
B Three
C Four
D None
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

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