State whether True or False :
If the flux of DC motor approaches to zero, its speed will also approach to zero.

True

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False

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Solution

The correct option is B False
In DC motor, the relation of speed and flux is given by $N \propto \frac{1}{ϕ}$ from the equation $E_{b} = ϕ Z N P / 60 A$ , when other things remain constant. Now if flux is approaches to zero then the speed will be approached to infinity.

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