Related Questions

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
Which is of the following data is required to draw the circle diagram for an induction motor?
A Block rotor test only
B No load test only
C Block rotor test and no-load test
D Block rotor test, no-load test and stator resistance test
The circle diagram for an induction motor cannot be used to determine
A Efficiency
B Power factor
C Frequency
D Output
The power scale of circle diagram of an induction motor can be found from
A Stator resistance test
B No-load test only
C Short-circuit test only
D None of the above
The complete circle diagram of induction motor can be drawn with the help of data found from
A No-load test
B Blocked rotor test
C Stator resistance test
D All of the above
When the equivalent circuit diagram of doouble squirrelcage 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
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
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
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because
A synchronous motor has no slip
B stator supply is not required to produce magnetic field
C mechanical load on the rotor remains constant
D synchronous motor has large airgap
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
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods

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