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Which motor should not be started on no-load?

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Which motor should not be started on no-load?

(a) DC Series motor

(b) DC Shunt motor

(c) Synchronous motor

(d) Induction motor

This question was addressed to me in my homework.

Question is from Operating Characteristics of DC Series Motor in chapter Characteristics of DC Motors of DC Machines

1 Answer

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Best answer
Correct answer is (a) DC Series motor

The best explanation: No-load speed of the DC motor is very high, it’ll create a dangerous situation and the centrifugal forces will destroy the armature and may harm the personnel. As, flux is inversely proportional to speed, speed will be infinity by calculations.

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