In Ward Leonard control of DC motor, the lower limit of speed is imposed by ____________(a) Residual magnetism of the generator(b) Core losses of motor(c) Mechanical losses of motor and generator together(d) Cannot be determinedThe question was asked in an interview for job.My query is from Ward Leonard Speed Control Method topic in chapter DC Motors of DC Machines

In Ward Leonard control of DC motor, the lower limit of speed is impos

1.	In Ward Leonard control of DC motor, the lower limit of speed is imposed by ____________(a) Residual magnetism of the generator(b) Core losses of motor(c) Mechanical losses of motor and generator together(d) Cannot be determinedThe question was asked in an interview for job.My query is from Ward Leonard Speed Control Method topic in chapter DC Motors of DC Machines
Answer» RIGHT choice is (a) RESIDUAL magnetism of the generator Easy explanation: We get the SPEED below the BASE value by reducing armature voltage, which is the SIMPLE method of reducing back emf which is proportional to the residual magnetism. Thus, lower limit of speed is imposed by residual magnetism of the generator.

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