No-load speed of which of the following DC motor will be highest?(a) Shunt motor(b) Series motor(c) Cumulative compound motor(d) Differentiate compound motorI had been asked this question during an interview for a job.I'd like to ask this question from Operating Characteristics of DC Series Motor -1 topic in portion Characteristics of DC Motors of DC Machines

No-load speed of which of the following DC motor will be highest?(a) S

1.	No-load speed of which of the following DC motor will be highest?(a) Shunt motor(b) Series motor(c) Cumulative compound motor(d) Differentiate compound motorI had been asked this question during an interview for a job.I'd like to ask this question from Operating Characteristics of DC Series Motor -1 topic in portion Characteristics of DC Motors of DC Machines
Answer» The correct answer is (b) Series motor Easy explanation: At no load, armature current TENDS to zero, flux φ tends to zero, where SPEED is inversely proportional to the flux, speed will tend to infinity. Thus, no load speed of DC series motor is HIGHEST.

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